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K Ishida - One of the best experts on this subject based on the ideXlab platform.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Takuya Ota, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, T Ota, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transformations in a ni54ga27Fe19 alloy
Materials Transactions, 2002Co-Authors: K Oikawa, Takuya Ota, Yuji Sutou, Toshihiro Ohmori, R Kainuma, K IshidaAbstract:The martensitic and magnetic transitions of Ni 54 Ga 27 Fe 19 alloy were investigated by difFerential scanning calorimetry and X-ray powder diffraction and with a vibrating sample magnetometer. The alloy is martensitically transformed from a L2 1 to a martensite phase with a 14M (7R) structure. The Ferromagnetic transition is also accompanied by the martensitic transformation from a paramagnetic parent phase to a Ferromagnetic martensite phase in the temperature interval between M s (= 293 K) and M f (= 274 K). The Ni-Ga-Fe System is promising as a Ferromagnetic shape memory alloy.
Maria K Doula - One of the best experts on this subject based on the ideXlab platform.
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simultaneous removal of cu mn and zn from drinking water with the use of clinoptilolite and its Fe modified form
Water Research, 2009Co-Authors: Maria K DoulaAbstract:Zeolites have been widely used in water treatment and especially clinoptilolite, due to its low cost and high abundance. It has large cation-exchange capacity and is capable of removing large quantities of heavy metals from contaminated water samples. By loading the surface of clinoptilolite with amorphous Fe-oxide species, a total improvement in adsorption capacity could be achieved. Thus, the Clin-Fe oxide System is capable of adsorbing significantly higher heavy metal concentrations than untreated clinoptilolite with simultaneous noticeable decrease in water hardness. Batch adsorption experiments have shown that Clin-Fe System has very large Cu, Zn and Mn adsorption capacity and for most of the cases the treated water samples were suitable for human consumption or agricultural use. New experiments were conducted to study the efFectiveness of clinoptilolite and of the Clin-Fe System in removal of Cu, Mn, Zn, present simultaneously in water samples, so that the study of metal-sorbent chemical behavior and of the adsorption selectivity would be Feasible. Desorption of metals was also examined and an integrated approach of the efFectiveness of such materials in drinking water treatment is presented.
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use of clinoptilolite and an Fe overexchanged clinoptilolite in zn2 and mn2 removal from drinking water
Desalination, 2008Co-Authors: A Dimirkou, Maria K DoulaAbstract:Abstract Clinoptilolite, a natural zeolite, was used for the synthesis of a high surface area clinoptilolite-iron oxide System (Clin–Fe System) to be used for the removal of Mn 2+ and Zn 2+ ions from drinking water samples. The new System was obtained by adding natural clinoptilolite to an iron nitrate solution in the presence of KOH solution. The Clin–Fe System had a specific surface area equal to 151 m 2 /g and was fully iron exchanged (Fe/Al = 1.23). Batch adsorption experiments were carried out to determine the efFectiveness of the Clin and of the Clin–Fe System in the removal of zinc and manganese from drinking water. For our experimental conditions, the maximum adsorbed Mn amount for Clin was 7.69 mg/g, whereas that for the Clin–Fe System was 27.1 mg/g. The respective values for the adsorption of Zn were 71.3 mg/g and 94.8 mg/g. In addition, the release of counterbalanced ions (i.e. Ca 2+ , Mg 2+ , Na + and K + ) was examined, as well as the dissolution of framework Si and Al. Desorption experiments were also carried out to determine which of the substrates is more efFective in holding the adsorbed metals on its surface sites.
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use of an iron overexchanged clinoptilolite for the removal of cu2 ions from heavily contaminated drinking water samples
Journal of Hazardous Materials, 2008Co-Authors: Maria K Doula, A DimirkouAbstract:Abstract Clinoptilolite, a natural zeolite, was used for the synthesis of a high surface area clinoptilolite–iron oxide System, in order to be used for the removal of Cu2+ ions from drinking water samples. The solid System was obtained by adding natural clinoptilolite in an iron nitrate solution under strongly basic conditions. The Clin–Fe System has specific surface area equal to 151 m2 g−1 and is fully iron exchanged (Fe/Al = 1.23). Batch adsorption experiments were carried out to determine the efFectiveness of the Clin and the Clin–Fe System in removal of copper from drinking water. Adsorption experiments were conducted by mixing 1.00 g of each of the substrates with certain volume of water samples contaminated with 10 difFerent Cu concentrations (from 3.15 × 10−5 to 315 × 10−2 M or from 2.00 to 2000 ppm Cu). For our experimental conditions, the maximum adsorbed Cu amount on Clin was 13.6 mg g−1 whereas on the Clin–Fe System was 37.5 mg g−1. The main factors that contribute to difFerent adsorption capacities of the two solids are due to new surface species and negative charge of the Clin–Fe System. In addition, the release of counterbalanced ions (i.e. Ca2+, Mg2+, Na+ and K+) was examined, as well as the dissolution of framework Si and Al. It was found that for the most of the samples the Clin–Fe System releases lower concentrations of Ca, Mg and Na and higher concentrations of K than Clin, while the dissolution of Si/Al was limited. Changes in the composition of water samples, as well as in their pH and conductivities values were reported and explained.
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synthesis of a clinoptilolite Fe System with high cu sorption capacity
Chemosphere, 2007Co-Authors: Maria K DoulaAbstract:Abstract An iron oxide–clinoptilolite System was synthesized by adding natural clinoptilolite in an iron nitrate solution under strongly basic condition. The newly synthesized material has a red–brown color. A combination of XRD, FTIR and EPR spectroscopies, as well as specific surface area measurements and TG/DSC thermal analyses provided information on the type of Fe species located on the zeolite surface. Clinoptilolite seems to maintain its structure, while Fe 3+ species are in a symmetric environment (Th or Oh). The new material has a noteworthy high value of specific surface area (151 m 2 g −1 ) and is fully iron exchanged (Fe/Al = 1.23). DifFerences in FTIR and TG/DSC spectrograms between the Fe–Clin System and untreated Clin were reported and explained. According to Cu adsorption/desorption experiments, carried out after the synthesis and characterization procedures, the Fe–Clin System is a promising new material since it adsorbs significantly larger Cu concentrations than clinoptilolite. This fact is owed to its high specific surface area and to its high negative surface charge. Desorption of Cu was also examined and it was observed that the Fe–Clin System desorbs smaller Cu amounts than untreated clinoptilolite.
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removal of mn2 ions from drinking water by using clinoptilolite and a clinoptilolite Fe oxide System
Water Research, 2006Co-Authors: Maria K DoulaAbstract:Abstract Clinoptilolite, a natural zeolite, was used for the synthesis of a high surface area Clinoptilolite–Iron oxide System, in order to be used for the removal of Mn 2+ ions from drinking water samples. The new System was obtained by adding natural clinoptilolite in an iron nitrate solution under strongly basic conditions. The Clin–Fe System has specific surface area equal to 151.0 m 2 /g and is fully iron exchanged (Fe/Al=1.23). Batch adsorption experiments were carried out to determine the efFectiveness of the Clin and the Clin–Fe System in removal of manganese from drinking water. Adsorption experiments were conducted by mixing 1.00 g of each of the substrates with certain volume of water samples contaminated with 10 difFerent Mn concentrations (from 3.64×10 −6 to 1.82×10 −2 M or from 0.2 to 1000 ppm). For the present experimental conditions, the Mn adsorption capacity of Clin was 7.69 mg/g, whereas, of Clin–Fe System was 27.12 mg/g. The main factors that contribute to difFerence adsorption capacity of the two solids are due to new surface species and negative charge of Clin–Fe System. In addition, the release of counterbalanced ions (i.e., Ca 2+ , Mg 2+ , Na + and K + ) was examined as well as the dissolution of framework Si and Al. It was found that for the most of the samples the Clin–Fe System releases lower concentrations of Ca, Mg and Na and higher concentrations of K than Clin, while the dissolution of Si/Al was limited. Changes in the composition of water samples as well as in their pH and conductivities values were reported and explained.
K Oikawa - One of the best experts on this subject based on the ideXlab platform.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Takuya Ota, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, T Ota, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transformations in a ni54ga27Fe19 alloy
Materials Transactions, 2002Co-Authors: K Oikawa, Takuya Ota, Yuji Sutou, Toshihiro Ohmori, R Kainuma, K IshidaAbstract:The martensitic and magnetic transitions of Ni 54 Ga 27 Fe 19 alloy were investigated by difFerential scanning calorimetry and X-ray powder diffraction and with a vibrating sample magnetometer. The alloy is martensitically transformed from a L2 1 to a martensite phase with a 14M (7R) structure. The Ferromagnetic transition is also accompanied by the martensitic transformation from a paramagnetic parent phase to a Ferromagnetic martensite phase in the temperature interval between M s (= 293 K) and M f (= 274 K). The Ni-Ga-Fe System is promising as a Ferromagnetic shape memory alloy.
R Kainuma - One of the best experts on this subject based on the ideXlab platform.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Takuya Ota, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, T Ota, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transformations in a ni54ga27Fe19 alloy
Materials Transactions, 2002Co-Authors: K Oikawa, Takuya Ota, Yuji Sutou, Toshihiro Ohmori, R Kainuma, K IshidaAbstract:The martensitic and magnetic transitions of Ni 54 Ga 27 Fe 19 alloy were investigated by difFerential scanning calorimetry and X-ray powder diffraction and with a vibrating sample magnetometer. The alloy is martensitically transformed from a L2 1 to a martensite phase with a 14M (7R) structure. The Ferromagnetic transition is also accompanied by the martensitic transformation from a paramagnetic parent phase to a Ferromagnetic martensite phase in the temperature interval between M s (= 293 K) and M f (= 274 K). The Ni-Ga-Fe System is promising as a Ferromagnetic shape memory alloy.
Toshihiro Ohmori - One of the best experts on this subject based on the ideXlab platform.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Takuya Ota, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transitions in Ferromagnetic ni ga Fe shape memory alloys
Applied Physics Letters, 2002Co-Authors: K Oikawa, Toshihiro Ohmori, R Kainuma, Yuuki Tanaka, Haruhiko Morito, A Fujita, K Fukamichi, T Ota, K IshidaAbstract:Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe System have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the Ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for Ferromagnetic shape memory alloys.
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magnetic and martensitic phase transformations in a ni54ga27Fe19 alloy
Materials Transactions, 2002Co-Authors: K Oikawa, Takuya Ota, Yuji Sutou, Toshihiro Ohmori, R Kainuma, K IshidaAbstract:The martensitic and magnetic transitions of Ni 54 Ga 27 Fe 19 alloy were investigated by difFerential scanning calorimetry and X-ray powder diffraction and with a vibrating sample magnetometer. The alloy is martensitically transformed from a L2 1 to a martensite phase with a 14M (7R) structure. The Ferromagnetic transition is also accompanied by the martensitic transformation from a paramagnetic parent phase to a Ferromagnetic martensite phase in the temperature interval between M s (= 293 K) and M f (= 274 K). The Ni-Ga-Fe System is promising as a Ferromagnetic shape memory alloy.
