Li(Nb,Ta)O3单晶中氢和锂示踪剂扩散系数与氢浓度的关系

IF 3.3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Claudia Kofahl , Lars Dörrer , Steffen Ganschow , Hendrik Wulfmeier , Holger Fritze , Harald Schmidt
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引用次数: 0

摘要

对于LiNb1-xTaxO3单晶,在低于600℃的温度下,Li和H(作为杂质)的离子扩散率对整体电导率有很强的影响。我们研究了H和Li在LiNbO3、LiTaO3和LiNb0.15Ta0.85O3单晶中的扩散与H浓度在510℃下超过两个数量级的关系。氢气扩散实验是通过D2O气体大气中氘(D)和氢(H)的同位素交换和红外光谱来实现的。锂扩散实验采用6Li/7Li示踪剂交换和二次离子质谱法进行。在5 × 1016 cm−3和3 × 1018 cm−3之间,随着氢浓度的增加,两种扩散器的扩散系数都略有下降,最大下降幅度为2 ~ 3倍。我们认为,当氢的浓度达到约3 × 1018 cm−3时,晶格中氢的掺入量的增加只会轻微地改变两种物质的迁移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrogen and lithium tracer diffusivities as a function of hydrogen concentration in Li(Nb,Ta)O3 single crystals
For LiNb1-xTaxO3 single crystals, the ion diffusivities of the species Li and H (as an impurity) have strong influence on the overall conductivity at temperatures below 600 °C. We investigated the diffusion of H and Li in LiNbO3, LiTaO3, and LiNb0.15Ta0.85O3 single crystals as a function of H concentration over two order of magnitude at 510 °C. The hydrogen diffusion experiments were realized by isotope exchange of deuterium (D) and hydrogen (H) in a gaseous D2O atmosphere and infra-red spectroscopy. The lithium diffusion experiments were done by 6Li/7Li tracer exchange and Secondary Ion Mass Spectrometry. The diffusivities of both types of species decrease only slightly with increasing hydrogen concentration between 5 × 1016 cm−3 and 3 × 1018 cm−3 by a maximum factor of two to three for each type of diffusor. We suggest that the increased incorporation of hydrogen up to a concentration of about 3 × 1018 cm−3 into the lattice modifies only very slightly the migration of both species.
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来源期刊
Solid State Ionics
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.
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