Features of hydrogen diffusion and spatial heterogeneity of its distribution in pure LiNbO3 crystals of congruent composition

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-05-08 DOI:10.1016/j.ssi.2025.116888

A.V. Yatsenko , V.F. Shul'gin , S.V. Yagupov , O.V. Palatnikova , N.V. Sidorov , M.N. Palatnikov

引用次数: 0

Abstract

Diffusion of H⁺ ions in pure LiNbO₃ crystals of congruent composition in the temperature range of 948–998 K has been studied by IR spectroscopy. It has been shown that in this temperature range the diffusion of H⁺ ions is substantially anisotropic and the diffusion constants along the polar and non-polar directions differ by approximately 2 times. When the diffusion activation energy Е_а = 1.03 eV, the corresponding values are (D_o)_z = (0.050 ± 0.007) cm⁻² and (D_o)_x = (0.027 ± 0.003) cm⁻². It has been shown that a significant gradient of the volume concentration of H⁺ ions arises during proton exchange in large-volume LiNbO₃ crystals.

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氢在同成分纯LiNbO3晶体中的扩散特征及其分布的空间非均质性

用红外光谱法研究了H+离子在948 ~ 998 K温度范围内在组成一致的纯LiNbO3晶体中的扩散。结果表明，在此温度范围内，H+离子的扩散基本上是各向异性的，沿极性和非极性方向的扩散常数相差约2倍。当扩散活化能Еа = 1.03 eV时，对应的值为（Do）z =(0.050±0.007)cm−2,(Do)x =(0.027±0.003)cm−2。研究表明，在大体积LiNbO3晶体中质子交换过程中，H+离子的体积浓度会发生显著的梯度变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.