铀掺杂一维量子反铁磁体Ca2CuO3的合成与结构表征
Synthesis and structural characterization of uranium-doped Ca2CuO3, a 1D quantum antiferromagnet
摘要：
本文介绍了一种改进的溶胶-凝胶法制备超细均匀掺铀238（x=0-0.05）Ca_2CuO_3粉末的工艺条件。通过拉曼光谱、红外光谱和从头算方法对所观察到的光学声子进行了几乎完全的分类，并对化合物的结构、相纯度进行了分析，对铀在化合物中的作用进行了论证。通过掺杂实现了颗粒尺寸的显着减小，并且观察到电阻率与掺杂浓度之间的强相关性，并使用声子辅助电子跳跃导电模型进行解释。共价绝缘状态在所有化合物中的持久性是这类化合物的一个关键特征。
英文摘要：
The technological settings of a modified sol-gel method for preparation of highly fine homogeneous powder Ca2CuO3 doped with uranium 238 (x=0-0.05) is presented. The analysis of structure, purity of phases and the justification for the role of uranium in the given compounds are provided together with almost complete classification of observed optical phonons by means of the Raman, IR measurements and ab initio calculation. The significant reduction in particle size was achieved by doping and the strong correlation between resistivity and doping concentration was observed and explained using the phonon-assisted electron hopping conduction model. The persistence of covalent insulation state in all compounds is a key feature of this class of compounds.
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