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首页> 外文期刊>Physica status solidi, B. Basic research >Size effect on magnetic susceptibility of titanium monoxide nanocrystals
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Size effect on magnetic susceptibility of titanium monoxide nanocrystals

机译:尺寸对一氧化钛纳米晶体磁化率的影响

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摘要

For the first time a magnetic quantum-size effect is found in paramagnetic titanium monoxide nanocrystals with the sizes down to 30nm. In situ measurements in the temperature range from 300 to 1200K showed that the magnetic susceptibility of superstoichiometric titanium monoxide nanocrystals TiOy (y>1) depends not only on the structural state of the sample, but also on the size of nanocrystals. The data analysis both for the ordered and disordered TiOy showed that the reason for inversely proportional dependence of Van-Vleck paramagnetism on the size of titanium monoxide nanocrystals is distortion of local symmetry of titanium and oxygen atoms near the nanocrystal surface. Van-Vleck contribution induced by the atomic-vacancy disordering in titanium monoxide is proportional to the deviation of the long-order parameter from its maximal value.
机译:首次在顺磁性一氧化钛纳米晶体中发现了磁性量子尺寸效应,其尺寸低至30nm。在300至1200K的温度范围内进行的原位测量表明,超化学计量一氧化钛纳米晶体TiOy(y> 1)的磁化率不仅取决于样品的结构状态,还取决于纳米晶体的尺寸。对有序和无序TiOy的数据分析表明,Van-Vleck顺磁性与一氧化钛纳米晶体尺寸成反比关系的原因是钛和氧原子在纳米晶体表面附近的局部对称性变形。一氧化钛中的原子空位无序引起的Van-Vleck贡献与长期参数与其最大值的偏差成正比。

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