Structural Diversity and Phase Transitions in Mg2 – xMn1 + xBO5 (x = 0.0, 0.2, 0.4) Borates with a Mixed Valence

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2024-11-12 DOI:10.1134/S0021364024603075

N. A. Belskaya, N. V. Kazak, A. D. Vasiliev, E. V. Eremin, E. M. Moshkina, D. A. Velikanov, L. N. Bezmaternykh, S. Yu. Gavrilkin, S. G. Ovchinnikov

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Abstract

Single and polycrystalline samples of Mg_{2 –} _xMn_{1 +} _xBO₅ (x = 0.0, 0.2, 0.4) oxyborates have been obtained for the first time by spontaneous crystallization from the solution–melt and through a solid-state reaction. X-ray diffraction studies have shown that compounds are crystallized with increasing manganese content in the ludwigite (space group Pbam)–hulsite (space group P2/m)–orthopinakiolite (space group Pbam) series and belong to the “3 Å wallpaper” borate family. A common property of materials is the presence of octahedral complexes (walls) consisting of manganese ions with a mixed valence at even crystallographic sites. The dc magnetization and specific heat of the Mg_{2 –} _xMn_{1 +} _xBO₅ (x = 0.0, 0.2, 0.4) compounds have been studied for the first time. These studies have shown that cooling is accompanied by magnetic transitions, which are due to the ordering of several magnetic subsystems.

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混合价硼酸盐 Mg2 - xMn1 + xBO5 (x = 0.0, 0.2, 0.4) 中的结构多样性和相变

通过溶融自发结晶和固态反应，首次获得了 Mg2 - xMn1 + xBO5 (x = 0.0, 0.2, 0.4) 氧硼酸盐的单晶和多晶样品。X 射线衍射研究表明，随着锰含量的增加，这些化合物会结晶成 ludwigite（空间群 Pbam）-hulsite（空间群 P2/m）-orthopinakiolite（空间群 Pbam）系列，属于 "3 Å 壁纸 "硼酸盐家族。这些材料的一个共同特性是在偶数晶体学位点存在由混合价态锰离子组成的八面体复合物（壁）。我们首次对 Mg2 - xMn1 + xBO5（x = 0.0、0.2、0.4）化合物的直流磁化和比热进行了研究。这些研究表明，冷却伴随着磁性转变，这是由于几个磁性子系统的有序化造成的。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.