用红外光谱法研究 LiNb0.15Ta0.85O3 单晶中的氢吸收和扩散实验

Q4 Physics and Astronomy

Defect and Diffusion Forum Pub Date : 2023-12-12 DOI:10.4028/p-2J7FpE

C. Kofahl, Steffen Ganschow, Harald Schmidt

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引用次数: 0

摘要

氢是一种杂质，经常出现在 LiXO3（X= Nb、Ta）单晶和相关材料中。在这种情况下，氢的扩散是一个重要的过程，因为它可能会影响材料的整体电导率。我们研究了 600 °C 下 LiNb0.15Ta0.85O3 单晶中的扩散吸氢。在实验中，通过液态氘化水（D2O）通入 O2，从而导致气体环境中的 D2O 饱和，并在等温退火过程中融入晶体。通过红外光谱测定了氘在吸收过程中的扩散率。我们发现了一个与示踪剂扩散相关的快速过程，以及另一个扩散率几乎低三倍的慢速过程。

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Experiments on Hydrogen Uptake and Diffusion in LiNb0.15Ta0.85O3 Single Crystals by Infra-Red Spectroscopy

Hydrogen is an impurity that is often present in LiXO3 (X= Nb, Ta) single crystals and related materials. In this context, the diffusion of hydrogen is an important process because it may influence the overall conductivity of the material. We investigated the diffusional hydrogen uptake in LiNb0.15Ta0.85O3 single crystals at 600 °C. For the experiments, O2 is bubbled through liquid deuterated water (D2O), which leads to a saturation of the gas atmosphere with D2O that is incorporated into the crystal during isothermal annealing. The diffusivities of deuterium during uptake were determined by infra-red spectroscopy. We identified a fast process that can be associated with tracer diffusion and a second slower process with an almost three times lower diffusivity.

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来源期刊

Defect and Diffusion Forum Physics and Astronomy-Radiation

CiteScore

1.20

自引率

0.00%

发文量

127

期刊介绍： Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.