Abstract Influence of thermal treatment in H2 atmosphere on magnetic and dielectric properties of nanocrystalline BaTiO3 samples was studied. It was found that increase of the concentration of oxygen vacancies during prolonged annealing in hydrogen leads to a noticeable increase in the diamagnetic response and a decrease in the magnetization and dielectric permittivity. Observed changes of magnetic properties probably are caused by the modification in a state of oxidation of titanium ions in the surface layer. Along with these the experimental results revealed that magnetization of the nanocrystalline BaTiO3 is proportional to the total surface area of nanogranules in the sample.

中文翻译：

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氧空位对纳米晶钛酸钡磁介电性能的影响

摘要 研究了H2 气氛热处理对纳米晶BaTiO3 样品磁介电性能的影响。发现在氢气中长时间退火期间氧空位浓度的增加导致抗磁响应的显着增加以及磁化和介电常数的降低。观察到的磁性变化可能是由于表面层中钛离子在氧化状态下的改性引起的。连同这些实验结果表明，纳米晶 BaTiO3 的磁化强度与样品中纳米颗粒的总表面积成正比。