The structural and the magnetic properties of Gd2Fe16Cr compound are investigated by x-ray diffraction and magnetization measurements. The Gd2Fe16Cr compound has a rhombohedral Th2Zn17-type structure. There exist an a...The structural and the magnetic properties of Gd2Fe16Cr compound are investigated by x-ray diffraction and magnetization measurements. The Gd2Fe16Cr compound has a rhombohedral Th2Zn17-type structure. There exist an anisotropic strong spontaneous magnetostriction and a negative thermal expansion in the magnetic state of Gd2Fe16Cr compound. The average thermal expansion coefficient a = -7.03×10^-6/K in a temperature range of 294-454 K and a = -1.31×10^-5/K in 454-572 K are obtained. The spontaneous magnetostrictive deformation and the Curie temperature are discussed.展开更多
Following a new method developed by the authors the temperature of a non-stationary Kerr-Newman black hole is given.The temperature is homogeneous everywhere at the event horizon and only depends on the time.
基金Project supported by the National Natural Science Foundation of China (Grant No.50871074)the Natural Science Foundation of Tianjin University of Science and Technology,China (Grant No.0200153)
文摘The structural and the magnetic properties of Gd2Fe16Cr compound are investigated by x-ray diffraction and magnetization measurements. The Gd2Fe16Cr compound has a rhombohedral Th2Zn17-type structure. There exist an anisotropic strong spontaneous magnetostriction and a negative thermal expansion in the magnetic state of Gd2Fe16Cr compound. The average thermal expansion coefficient a = -7.03×10^-6/K in a temperature range of 294-454 K and a = -1.31×10^-5/K in 454-572 K are obtained. The spontaneous magnetostrictive deformation and the Curie temperature are discussed.
基金Supported by the National Natural Science Foundation of China.
文摘Following a new method developed by the authors the temperature of a non-stationary Kerr-Newman black hole is given.The temperature is homogeneous everywhere at the event horizon and only depends on the time.
