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arXiv 1106.5446cond-mat.mtrl-sci
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新型Zn1.5Co1.5B7 O 13 Br硼酸盐的晶体结构和磁性

Crystal Structure and Magnetic Properties of the New Zn1.5Co1.5B7O13Br Boracite

Roberto Escudero, Francisco Morales, Marco A Leyva Ramirez, Jorge Campa-Molina, S. Ulloa-Godinez

摘要:

在1173 K下,用化学输运法在石英安瓿中生长了新的Zn 1.5Co 1.5B7O 13 Br硼酸盐晶体。用X射线衍射法对晶体结构进行了表征。晶体为正交晶系,空间群为Pca 21(No.29)。测定的晶胞参数为:a = 8.5705(3)Ω,b = 8.5629(3)Ω,c = 12.1198(4)Ω,晶胞体积V = 889.45(5)Ω 3,Z = 4。测定了新方镁石单晶的磁性。研究了不同磁场强度下的磁化率-温度(X-T)行为。磁化率X ~(-1)(T)的倒数表现出自旋s = 3/2的Curie-Weiss特性和小的轨道贡献l。在低于10 K的低温下,X(T)显示出强烈依赖于所施加的磁场的不可逆性。这种方镁石是亚铁磁性的最高温度约为16 K,显示矫顽场。由于磁场的影响,不可逆性的降低可能与变磁相变有关。

英文摘要:

New Zn1.5Co1.5B7O13Br boracite crystals were grown by chemical transport reactions in quartz ampoules, at a temperature of 1173 K. The crystal structure was characterized by X-ray diffraction. The crystals present an orthorhombic structure with space group Pca21, (No. 29). The determined cell parameters were: a = 8.5705(3)Å, b = 8.5629(3) Å, and c = 12.1198(4)Å, and cell volume, V = 889.45(5) Å3 with Z = 4. Magnetic properties in single crystals of the new boracite, were determined. The Susceptibility-Temperature (X -T) behavior at different magnetic intensities was studied. The inverse of the magnetic susceptibility X-1(T) shows a Curie-Weiss characteristic with spin s = 3/2 and a small orbital contribution, l. At low temperatures, below 10 K, X(T) shows irreversibility that is strongly dependent on the applied magnetic field. This boracite is ferrimagnetic up to a maximum temperature of about 16 K, as shows the coercive field. The reduction of the irreversibility by the influence of the magnetic field, may be related to a metamagnetic phase transition.

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