Features of the Structure and Thermal Properties of Borate Tungstates LnBWO6 (Ln = La; La0.999Nd0.001 and La0.99Gd0.01) Synthesized by the Sol–Gel Method

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Russian Journal of Inorganic Chemistry Pub Date : 2024-07-31 DOI:10.1134/s0036023624600394

V. A. Krut’ko, M. G. Komova, R. D. Svetogorov, A. V. Khoroshilov, N. N. Efimov, E. A. Ugolkova

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Abstract

Borate tungstates LnBWO₆ (Ln = La; La_0.999Nd_0.001 and La_0.99Gd_0.01) are synthesized by the Pechini method followed by annealing of the intermediates and examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystallographic parameters of the synthesized LnBWO₆ are refined by powder X-ray diffraction in two crystal systems: monoclinic (space group P2₁) and orthorhombic (space group P222). Reversible first-order phase transitions in the synthesized LnBWO₆ are detected by the DSC method, and the temperatures and enthalpies of phase transformations are determined. The doping of LnBWO₆ with Nd³⁺ and Gd³⁺ ions is shown to decrease the temperature of the LT (low-temperature) → HT (high-temperature) phase transition of LaBWO₆. Two independent positions of Gd in the La_0.99Gd_0.01BWO₆ structure are determined from the experimental electron paramagnetic resonance (EPR) data.

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溶胶-凝胶法合成的硼酸盐钨酸盐 LnBWO6（Ln = La；La0.999Nd0.001 和 La0.99Gd0.01）的结构和热性能特征

摘要通过佩奇尼法合成了硼钨酸盐 LnBWO6（Ln = La；La0.999Nd0.001 和 La0.99Gd0.01），然后对中间产物进行退火处理，并通过 X 射线衍射 (XRD) 和差示扫描量热 (DSC) 进行了检验。合成的 LnBWO6 的晶体学参数通过粉末 X 射线衍射细化为两个晶系：单斜晶系（空间群 P21）和正交晶系（空间群 P222）。利用 DSC 方法检测了合成 LnBWO6 中的可逆一阶相变，并确定了相变的温度和焓。结果表明，在 LnBWO6 中掺杂 Nd3+ 和 Gd3+ 离子可降低 LaBWO6 的 LT（低温）→HT（高温）相变温度。根据电子顺磁共振（EPR）实验数据确定了 Gd 在 La0.99Gd0.01BWO6 结构中的两个独立位置。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

期刊介绍： Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.