The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
J E Crow - One of the best experts on this subject based on the ideXlab platform.
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Ten Minute Preparation Of Yba 2 Cu 3 O 7−x Using Barium Hydroxide
MRS Proceedings, 2011Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 CuO x−7 was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide, in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated, (900 C, 18–24 h, in air, followed by 500 C, 5 h., in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnetic response (field cooled), 76% (zero field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly
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preparation of yba 2 cu 3 o 7 x using Barium Hydroxide flux
Journal of Materials Research, 1990Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 Cu 3 O 7− x was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated (900 °C, 18–24 h in air, followed by 500 °C, 5 h in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnet response (field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly.
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Preparation of YBa 2 Cu 3 O 7− x using Barium Hydroxide flux
Journal of Materials Research, 1990Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 Cu 3 O 7− x was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated (900 °C, 18–24 h in air, followed by 500 °C, 5 h in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnet response (field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly.
Sang Shangbin - One of the best experts on this subject based on the ideXlab platform.
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Studies by XRD on discharge products of negative electrode in Zn-Ni battery
Chinese Battery Industry, 2020Co-Authors: Sang ShangbinAbstract:The compound of calcium zincate,of which the composition was Ca(OH)_2·2Zn(OH)_2·2H_2O,was prepared by a chemical method.The crystal structure was verified by XRD.The mixture of zinc oxide and Barium Hydroxide was prepared by a mechanical method.The calcium zincate and the mixture of zinc oxide and Barium Hydroxide were used for active materials in negative electrode of Zn-Ni battery.The mock up Zn-Ni battery was assembled.The morphology changes of discharge productions of active materials in cathode and the changing trend of quantity of components were studied by XRD.The results of XRD showed that,in negative electrode whose active materials was prepared by the calcium zincate,when battery was discharged,the discharge products — zinc oxide partly changed into calcium zincate by combining with calcium Hydroxide;in cathode whose active materials was prepared by the mixture of zinc oxide and Barium Hydroxide,Barium Hydroxide changed into Barium carbonate by combining with carbon dioxide which was dissolved in electrolyte and zinc oxide can not combine with Barium Hydroxide and it was dissolved in electrolyte quickly.
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Studies on negative electrode of Zn-Ni battery by means of XRD
Chinese Journal of Power Sources, 2020Co-Authors: Sang ShangbinAbstract:The compound of calcium zincate, of which the composition was Ca(OH)2·2 Zn(OH)2·2 H2O,was prepared by a chemical method. The crystal structure was verified by XRD. The mixture of zinc oxide and Barium Hydroxide was prepared by a mechanical method. The calcium zincate and the mixture of zinc oxide and Barium Hydroxide were used for active materials as negative electrode of Zn-Ni battery. The simulated Zn-Ni battery was assembled. The morphology changes of discharged productions of active materials in cathode and the changed current of quantity of components were studied by XRD. The results showed cathodic active materials were prepared by the calcium zincate , the discharged production zinc oxide partly changed into calcium zincate by combining with calcium Hydroxide; while cathodic active materials were prepared by the mixture of zinc oxide and Barium Hydroxide, Barium Hydroxide changed into Barium carbonate by combining with carbon dioxide which was dissolved in electrolyte and zinc oxide could not combine with Barium Hydroxide and dissolved in electrolyte quickly .
Per J Liesen - One of the best experts on this subject based on the ideXlab platform.
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microwave accelerated crossed cannizzaro reaction using Barium Hydroxide under solvent free conditions
Tetrahedron Letters, 1998Co-Authors: Rajender S Varma, Kannan P Naicker, Per J LiesenAbstract:Abstract A solventless and expeditious method for the preparation of alcohols is described from aldehydes using Barium Hydroxide, Ba(OH)2.8H2O, and paraformaldehyde. A comparison of this microwave-accelerated Cannizzaro reaction to the one under conventional heating mode is also reported.
David Watt - One of the best experts on this subject based on the ideXlab platform.
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sulphate resistance of lime based Barium mortars
Cement & Concrete Composites, 2008Co-Authors: Ioannis Karatasios, V Kilikoglou, Panagiotis Theoulakis, Belinda Colston, David WattAbstract:Abstract This work studies the effect of Barium Hydroxide on the sulphate-resistance of lime-based mortars when used as an additive material to the lime binder. The overall aim of the work is to study the potential of Barium Hydroxide in producing a mixed binder with lime, which is able to fix the sulphate ions, block the diffusion of sulphate solutions and therefore, reduce the degradation rate of mixtures. The durability of different mixtures was studied through sulphate salt crystallisation and acid rain simulation tests, along with the characterisation of their pore-space properties. X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX) and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) were used for materials characterisation. Experimental results proved that Barium Hydroxide increases the durability of hardened mixtures against sulphate attack, without affecting the microstructure characteristics.
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setting process of lime based conservation mortars with Barium Hydroxide
Cement and Concrete Research, 2007Co-Authors: Ioannis Karatasios, V Kilikoglou, Panagiotis Theoulakis, Belinda Colston, David WattAbstract:This paper presents the effect of Barium Hydroxide on the setting mechanism of lime-based conservation mortars, when used as an additive material. The study focuses on the monitoring of the setting process and the identification of the mineral phases formed, which are essential for furthering the study of the durability of Barium mixtures against chemical degradation. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and thermal analysis (DTA-TG) were used to monitor the setting processes of these mixtures and identify new phases formed. The results suggest that Barium Hydroxide is evenly distributed within the lime and produces a homogeneous binding material, consisting of calcite (CaCO{sub 3}), witherite (BaCO{sub 3}) and Barium-calcium carbonate [BaCa(CO{sub 3}){sub 2}]. Finally, it was found that Barium carbonate can be directly bonded to calcitic aggregates and therefore increases its chemical compatibility with the binding material.
N Coppa - One of the best experts on this subject based on the ideXlab platform.
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Ten Minute Preparation Of Yba 2 Cu 3 O 7−x Using Barium Hydroxide
MRS Proceedings, 2011Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 CuO x−7 was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide, in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated, (900 C, 18–24 h, in air, followed by 500 C, 5 h., in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnetic response (field cooled), 76% (zero field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly
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preparation of yba 2 cu 3 o 7 x using Barium Hydroxide flux
Journal of Materials Research, 1990Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 Cu 3 O 7− x was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated (900 °C, 18–24 h in air, followed by 500 °C, 5 h in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnet response (field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly.
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Preparation of YBa 2 Cu 3 O 7− x using Barium Hydroxide flux
Journal of Materials Research, 1990Co-Authors: N Coppa, A Kebede, J Schwegler, I Perez, R E Salomon, G H Myer, J E CrowAbstract:High quality bulk YBa 2 Cu 3 O 7− x was synthesized by fusing stoichiometric amounts of yttrium and copper nitrates and Barium Hydroxide in air, using an ordinary Bunsen burner. The starting materials go through a short-lived liquid phase yielding a solid black product which was subsequently heat treated (900 °C, 18–24 h in air, followed by 500 °C, 5 h in O 2 ). These materials were greater than 99% phase pure with CuO as the only other phase and they exhibited a transition temperature of 92 K, a 15.5% perfect diamagnet response (field cooled). This synthesis represents an improvement over the much more labor and time intensive conventional methods in that it allows high quality materials of various compositions to be prepared quickly.
