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首页> 外文期刊>International Journal of Quantum Chemistry >Thermal properties of rare earth dodecaborides
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Thermal properties of rare earth dodecaborides

机译:稀土十二硼化物的热学性质

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We have measured heat capacity and thermal expansion of rare earth dodecaborides REB12 (RE = Y, Tb-Tm, Lu). YB12 and LuB12 are diamagnetics whereas the other dodecaborides are ordered antiferromagnetically. The amplitude of the heat capacity discontinuity at the Neel temperature and the shape of the heat capacity variation in the critical region for all these antiferromagnetics are characteristics for amplitude-modulated magnetic structures. In the ordered state TbB12 reveals two first-order phase transitions, most likely due to magnetic structure changes. The heat capacity of ErB12 just below the Neel point shows an anomaly of unclear origin. From the Schottky contribution to the heat capacity we have determined crystal field parameters. They are completely different than that is estimated from Point Charge Model. (C) 2003 Elsevier Inc. All rights reserved. [References: 23]
机译:我们已经测量了稀土十二硼酸盐REB12的热容和热膨胀(RE = Y,Tb-Tm,Lu)。 YB12和LuB12是抗磁性的,而其他十二硼化物则是反铁磁性的。对于所有这些反铁磁材料,在尼尔温度下热容不连续的幅度和临界区中热容变化的形状是调幅磁性结构的特征。在有序状态下,TbB12显示出两个一阶相变,最有可能是由于磁性结构的变化。恰好在Neel点以下的ErB12的热容显示来源不明确的异常。根据肖特基对热容量的贡献,我们确定了晶体场参数。它们与根据点电荷模型估算的完全不同。 (C)2003 Elsevier Inc.保留所有权利。 [参考:23]

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