Phase Formation, Polymorphism, Optical Properties, and Conductivity of Nd2WO6-Based Compounds and Solid Solutions

IF 0.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Russian Journal of Physical Chemistry A Pub Date : 2024-10-28 DOI:10.1134/S0036024424701735

E. D. Baldin, N. V. Lyskov, V. A. Rassulov, A. V. Shlyakhtina

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Abstract

The phase formation of neodymium tungstate Nd₂WO₆ from mechanically activated oxides was studied in a wide temperature range: 25–1600°C. Conditions for the formation of various polymorphic modifications were determined: low-temperature orthorhombic β-Nd₂WO₆ and δ-Nd₂WO₆ (P2₁2₁2₁ (no. 19)); high-temperature monoclinic Nd₂WO₆ (C12/c1 (no. 15)). Optical absorption spectra were studied for polymorphic ceramics with a nominal composition of Nd₂WO₆. Differences in the spectra of δ-Nd₂WO₆ and monoclinic Nd₂WO₆ were detected. Both modifications (δ-Nd₂WO₆ and monoclinic Nd₂WO₆) showed proton conductivity with activation energies of 1.05 and 1.06 eV, respectively. For the Ca-containing solid solution with a monoclinic structure (Nd\(_{{1 - x}}\)Ca_x)₂WO\(_{{6-\delta }}\) (x = 0.01), whose overall conductivity increases compared to that of pure monoclinic Nd₂WO₆, hole conductivity predominates in air.

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基于 Nd2WO6 的化合物和固溶体的相形成、多态性、光学特性和电导率

研究了机械活化氧化物中钕钨酸盐 Nd2WO6 在 25-1600°C 宽温度范围内的相形成。确定了形成各种多晶体修饰的条件：低温正交β-Nd2WO6 和 δ-Nd2WO6（P212121（编号 19））；高温单斜 Nd2WO6（C12/c1（编号 15））。研究了标称成分为 Nd2WO6 的多晶体陶瓷的光学吸收光谱。发现δ-Nd2WO6 和单斜 Nd2WO6 的光谱存在差异。两种改性（δ-Nd2WO6 和单斜 Nd2WO6）都显示出质子传导性，其活化能分别为 1.05 和 1.06 eV。对于具有单斜结构 (Nd\(_{{1 - x}}\)Cax)2WO\(_{{6-\delta }}\) (x = 0.01) 的含钙固溶体，其整体电导率比纯单斜 Nd2WO6 的电导率更高，在空气中空穴电导率占主导地位。

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.