Yu. S. Gokhfeld, N. V. Kazak, N. A. Bel’skaya, M. S. Molokeev, I. A. Gudim, O. A. Kondratiev, E. V. Eremin, Yu. V. Knyazev, D. A. Velikanov, S. G. Ovchinnikov
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引用次数: 0
摘要
摘要 通过自发结晶，从溶液熔体中生长出了 Cu2FeBO5 绿泥石单晶。利用 X 射线衍射方法详细解析了晶体结构。结果表明，位于 M2、M3 和 M4 位点的阳离子在结构上是无序的。研究还发现，氧原子在五个非等价位点（O4）中的一个位点处于无序状态。从莫斯鲍尔光谱数据可以看出，Fe3+ 离子占据了四个非等价位点，配位八面体的畸变程度各不相同。在 40 K ≤ T ≤ 300 K 的温度范围内，光谱代表了四极双重的叠加。静态磁感应强度测量显示了在 T1 = 35 K 和 T2 = 20 K 时的两个磁性特征以及自旋玻璃效应。4-300 K区间的比热测量没有发现与磁转变有关的异常现象。
Structural Disorder, Specific Heat, and Magnetic Transitions in Cu2FeBO5
Abstract
Cu2FeBO5 ludwigite single crystals have been grown from a solution–melt by spontaneous crystallization. Using the X-ray diffraction method, the crystal structure has been resolved in detail. Cations in sites M2, M3, and M4 have turned out to be structurally disordered. It has been found that oxygen atoms are disordered in one of five nonequivalent sites (O4). As can be seen from Mössbauer spectroscopy data, Fe3+ ions occupy four nonequivalent sites with different distortions of coordination octahedra. In the temperature range 40 K ≤ T ≤ 300 K, the spectra represent a superposition of quadrupole doublets. Static susceptibility measurements have revealed two magnetic features at T1 = 35 K and T2 = 20 K and spin-glass effects. Specific heat measurements in the interval 4–300 K have not discovered magnetic-transition-related anomalies.
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Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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