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Tarun Kumar Misra - One of the best experts on this subject based on the ideXlab platform.
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tetranuclear copper ii cubane complexes derived from self assembled 1 3 dimethyl 5 o phenolate azo 6 aminouracil structures non covalent interactions and Magnetic Property
New Journal of Chemistry, 2021Co-Authors: Nishithendu Bikash Nandi, Atanu Purkayastha, Shaktibrata Roy, Julia Klak, Rakesh Ganguly, Ibon Alkorta, Tarun Kumar MisraAbstract:Tetranuclear copper(II) complexes are of paramount importance in structural biology, and they are potential materials for magnetism and catalysis. To develop such a system, a new 6-aminoazouracil ligand, 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil (H2L, 1) with a NuNaO (Nu, uracil-N and Na, azo-N) chromophore was synthesized and used to generate a noble discrete doubly opened Cu4O4 cubane-like cluster ([CuL]4·2H2O, 2.2H2O) for studying magnetism. The coordination environment of Cu(II) is distorted square planar linked through phenolate-μ2-O bridges. The ligand crystallizes in the monoclinic space group P121/c1 and the complex is in the tetragonal I41/a space group with an S4 symmetry. The ligand has two dissociable hydrogen atoms in the solution with pK1 4.91 (hydrazone proton) and pK2 9.68 (phenolic proton). In the solid state, the ligand exhibits displaced stacking (energy, −69.5 and −77.3 kJ mol−1 for the molecules A and B, respectively) and tetrel bonding interactions (energy, −43.8 kJ mol−1). In 2.2H2O, the symmetrical units are stacked to show weak noncovalent interactions. The Magnetic Property of 2.2H2O was investigated based on the cubane [Cu4O4] core and discussed in detail, resulting in the exchange coupling parameter [(J1 (short Cu⋯Cu distances) = −110.1(1) cm−1, J2 (long Cu⋯Cu distances) = −27.1(2) cm−1)] that indicate a strong antiferroMagnetic interaction between tetranuclear copper(II) ions through μ-phenolate linkers, which is a result of the interaction of dx2−y2 orbitals in the square plane. The EPR study is concomitant with the results of magnetism. Thus, it could be a potential material in the field of antiferroMagnetic spintronics as well.
Masato Enokizono - One of the best experts on this subject based on the ideXlab platform.
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Magnetic characterization of the stator core of a high-speed motor made of an ultrathin electrical steel sheet using the Magnetic Property evaluation system
AIP Publishing LLC, 2018Co-Authors: Mohachiro Oka, Masato Enokizono, Yuji Mori, Kazumasa YamazakiAbstract:Recently, the application areas for electric motors have been expanding. For instance, electric motors are used in new technologies such as rovers, drones, cars, and robots. The motor used in such machinery should be small, high-powered, highly-efficient, and high-speed. In such motors, loss at high-speed rotation must be especially minimal. Eddy-current loss in the stator core is known to increase greatly during loss at high-speed rotation of the motor. To produce an efficient high-speed motor, we are developing a stator core for a motor using an ultrathin electrical steel sheet with only a small amount of eddy-current loss. Furthermore, the Magnetic Property evaluation for efficient, high-speed motor stator cores that use conventional commercial frequency is insufficient. Thus, we made a new high-speed Magnetic Property evaluation system to evaluate the Magnetic properties of the efficient high-speed motor stator core. This system was composed of high-speed A/D converters, D/A converters, and a high-speed power amplifier. In experiments, the ultrathin electrical steel sheet dramatically suppressed iron loss and, in particular, eddy-current loss. In addition, a new high-speed Magnetic Property evaluation system accurately evaluated the Magnetic properties of the efficient high-speed motor stator core
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Magnetic characteristic analysis and measurement of vector Magnetic Property of a non oriented electrical steel sheet under high Magnetic flux condition
IEEE Transactions on Magnetics, 2013Co-Authors: Shingo Zeze, Takashi Todaka, Masato EnokizonoAbstract:In this paper, vector Magnetic properties measurement and Magnetic characteristics analysis of a non-oriented electrical steel sheet under high Magnetic flux is presented. At first, the vector Magnetic Property of the non-oriented electrical steel sheet under the high Magnetic flux condition is measured. Next relationships between the Magnetic flux density vector $B$ and Magnetic field strength vector $H$ of ring core model is simulated by using the database of measured vector Magnetic Property and a dynamic integration type E&S modeling. As the results, the difference of the maximum Magnetic flux density $\vert B\vert_{\max}$ , the maximum Magnetic field strength $\vert H\vert_{\max}$ distribution and the local hysteresis loops in the ring core model is obtained by increasing the exciting voltage. In particular, it was clarified that $\vert H\vert_{\max}$ distribution and locus of $H$ vector was effected due to the Magnetic anisotropy of the non-oriented electrical steel sheet strongly.
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influence of stress on vector Magnetic Property under alternating Magnetic flux conditions
IEEE Transactions on Magnetics, 2011Co-Authors: Yuji Tsuchida, Takashi Todaka, Masato EnokizonoAbstract:Electrical steel sheet in actual rotating machines is magnetized under alternating and rotating Magnetic flux conditions. In addition, the Magnetic properties of the electrical steel sheet are affected by mechanical stress strongly and are deteriorated due to the residual stress during the manufacturing process. Therefore, it is important to know the Magnetic properties under various stress and Magnetic flux conditions. In this paper, we investigated the effect of the mechanical stress on vector Magnetic Property under alternating Magnetic flux conditions. Basing on the results, we can conclude that the vector Magnetic Property of the electrical steel sheet depends on the mechanical stress and the excitation direction. Therefore, it is important to consider the vector Magnetic Property with the mechanical stress in the design of the electrical machine.
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Effect of local residual stress in rotating machine core on vector Magnetic Property
19th International Conference on Electrical Machines ICEM 2010, 2010Co-Authors: Yuichiro Kai, Yuji Tsuchida, Takashi Todaka, Masato EnokizonoAbstract:It is well known that Magnetic properties of electrical steel sheet deteriorate in constructed cores due to residual stress during manufacturing process. In this paper, we clarify the local residual stress distribution in a rotating machine core. In addition, we examine relationships between vector Magnetic Property and stress based on the measured local residual stress distribution.
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examination of mechanism to apply stress in vector Magnetic Property measurement system under biaxial tensile stress
Ieej Transactions on Fundamentals and Materials, 2010Co-Authors: Hiroyasu Simoji, Yuji Tsuchida, Takashi Todaka, Masato EnokizonoAbstract:It is well known that Magnetic properties of electrical steel sheet deteriorate due to stress in production process of electrical apparatus. Therefore the Magnetic power loss increases in comparison to design-time assumptions. Therefore, it is necessary to clarify the relationship between the stress and the Magnetic Property. In general, the Magnetic properties of the electrical steel sheets become better by applying the tensile stress, and deteriorate by applying the compressive stress. The Magnetic Property under the stress has been evaluated by a scalar Magnetic measurement, which means same direction for the excitation and the stress in the electrical steel sheet. We developed new measurement system, which can evaluate the vector Magnetic Property under the biaxial stress. In this paper, the mechanism to apply the biaxial tensile stress is examined by measuring the principal stress. In addition, the vector Magnetic Property under the tensile stress of x and y direction is measured with the developed system. Figure 1 shows the developed vector Magnetic measurement system under biaxial tensile stress. The strain of the electrical steel sheet is measured with three-axial strain gauge. The stress components sx, sy and txy are calculated to evaluate the principal stress. The vector Magnetic Property is measured by using VH analyzer (IWATSU, IE131E). Figure 2 shows the vector Magnetic Property depending on the tensile stress of x direction. The principle stress of x direction is controlled by adding the biaxial stress in the developed system as shown Fig. 2. The trajectory of the Magnetic field strength and the BH loop of x and y components under the tensile stress changed in comparison with that of the non-stress. The area of BH loop of x component becomes smaller, and that of y component becomes larger by increasing the value of the tensile stress. Figure 3 shows the Magnetic Property depending on the maximum principal stress of the x direction. The relative
Nishithendu Bikash Nandi - One of the best experts on this subject based on the ideXlab platform.
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tetranuclear copper ii cubane complexes derived from self assembled 1 3 dimethyl 5 o phenolate azo 6 aminouracil structures non covalent interactions and Magnetic Property
New Journal of Chemistry, 2021Co-Authors: Nishithendu Bikash Nandi, Atanu Purkayastha, Shaktibrata Roy, Julia Klak, Rakesh Ganguly, Ibon Alkorta, Tarun Kumar MisraAbstract:Tetranuclear copper(II) complexes are of paramount importance in structural biology, and they are potential materials for magnetism and catalysis. To develop such a system, a new 6-aminoazouracil ligand, 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil (H2L, 1) with a NuNaO (Nu, uracil-N and Na, azo-N) chromophore was synthesized and used to generate a noble discrete doubly opened Cu4O4 cubane-like cluster ([CuL]4·2H2O, 2.2H2O) for studying magnetism. The coordination environment of Cu(II) is distorted square planar linked through phenolate-μ2-O bridges. The ligand crystallizes in the monoclinic space group P121/c1 and the complex is in the tetragonal I41/a space group with an S4 symmetry. The ligand has two dissociable hydrogen atoms in the solution with pK1 4.91 (hydrazone proton) and pK2 9.68 (phenolic proton). In the solid state, the ligand exhibits displaced stacking (energy, −69.5 and −77.3 kJ mol−1 for the molecules A and B, respectively) and tetrel bonding interactions (energy, −43.8 kJ mol−1). In 2.2H2O, the symmetrical units are stacked to show weak noncovalent interactions. The Magnetic Property of 2.2H2O was investigated based on the cubane [Cu4O4] core and discussed in detail, resulting in the exchange coupling parameter [(J1 (short Cu⋯Cu distances) = −110.1(1) cm−1, J2 (long Cu⋯Cu distances) = −27.1(2) cm−1)] that indicate a strong antiferroMagnetic interaction between tetranuclear copper(II) ions through μ-phenolate linkers, which is a result of the interaction of dx2−y2 orbitals in the square plane. The EPR study is concomitant with the results of magnetism. Thus, it could be a potential material in the field of antiferroMagnetic spintronics as well.
Atanu Purkayastha - One of the best experts on this subject based on the ideXlab platform.
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tetranuclear copper ii cubane complexes derived from self assembled 1 3 dimethyl 5 o phenolate azo 6 aminouracil structures non covalent interactions and Magnetic Property
New Journal of Chemistry, 2021Co-Authors: Nishithendu Bikash Nandi, Atanu Purkayastha, Shaktibrata Roy, Julia Klak, Rakesh Ganguly, Ibon Alkorta, Tarun Kumar MisraAbstract:Tetranuclear copper(II) complexes are of paramount importance in structural biology, and they are potential materials for magnetism and catalysis. To develop such a system, a new 6-aminoazouracil ligand, 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil (H2L, 1) with a NuNaO (Nu, uracil-N and Na, azo-N) chromophore was synthesized and used to generate a noble discrete doubly opened Cu4O4 cubane-like cluster ([CuL]4·2H2O, 2.2H2O) for studying magnetism. The coordination environment of Cu(II) is distorted square planar linked through phenolate-μ2-O bridges. The ligand crystallizes in the monoclinic space group P121/c1 and the complex is in the tetragonal I41/a space group with an S4 symmetry. The ligand has two dissociable hydrogen atoms in the solution with pK1 4.91 (hydrazone proton) and pK2 9.68 (phenolic proton). In the solid state, the ligand exhibits displaced stacking (energy, −69.5 and −77.3 kJ mol−1 for the molecules A and B, respectively) and tetrel bonding interactions (energy, −43.8 kJ mol−1). In 2.2H2O, the symmetrical units are stacked to show weak noncovalent interactions. The Magnetic Property of 2.2H2O was investigated based on the cubane [Cu4O4] core and discussed in detail, resulting in the exchange coupling parameter [(J1 (short Cu⋯Cu distances) = −110.1(1) cm−1, J2 (long Cu⋯Cu distances) = −27.1(2) cm−1)] that indicate a strong antiferroMagnetic interaction between tetranuclear copper(II) ions through μ-phenolate linkers, which is a result of the interaction of dx2−y2 orbitals in the square plane. The EPR study is concomitant with the results of magnetism. Thus, it could be a potential material in the field of antiferroMagnetic spintronics as well.
Shaktibrata Roy - One of the best experts on this subject based on the ideXlab platform.
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tetranuclear copper ii cubane complexes derived from self assembled 1 3 dimethyl 5 o phenolate azo 6 aminouracil structures non covalent interactions and Magnetic Property
New Journal of Chemistry, 2021Co-Authors: Nishithendu Bikash Nandi, Atanu Purkayastha, Shaktibrata Roy, Julia Klak, Rakesh Ganguly, Ibon Alkorta, Tarun Kumar MisraAbstract:Tetranuclear copper(II) complexes are of paramount importance in structural biology, and they are potential materials for magnetism and catalysis. To develop such a system, a new 6-aminoazouracil ligand, 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil (H2L, 1) with a NuNaO (Nu, uracil-N and Na, azo-N) chromophore was synthesized and used to generate a noble discrete doubly opened Cu4O4 cubane-like cluster ([CuL]4·2H2O, 2.2H2O) for studying magnetism. The coordination environment of Cu(II) is distorted square planar linked through phenolate-μ2-O bridges. The ligand crystallizes in the monoclinic space group P121/c1 and the complex is in the tetragonal I41/a space group with an S4 symmetry. The ligand has two dissociable hydrogen atoms in the solution with pK1 4.91 (hydrazone proton) and pK2 9.68 (phenolic proton). In the solid state, the ligand exhibits displaced stacking (energy, −69.5 and −77.3 kJ mol−1 for the molecules A and B, respectively) and tetrel bonding interactions (energy, −43.8 kJ mol−1). In 2.2H2O, the symmetrical units are stacked to show weak noncovalent interactions. The Magnetic Property of 2.2H2O was investigated based on the cubane [Cu4O4] core and discussed in detail, resulting in the exchange coupling parameter [(J1 (short Cu⋯Cu distances) = −110.1(1) cm−1, J2 (long Cu⋯Cu distances) = −27.1(2) cm−1)] that indicate a strong antiferroMagnetic interaction between tetranuclear copper(II) ions through μ-phenolate linkers, which is a result of the interaction of dx2−y2 orbitals in the square plane. The EPR study is concomitant with the results of magnetism. Thus, it could be a potential material in the field of antiferroMagnetic spintronics as well.