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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >X-ray and Neutron Diffuse Scattering in LiNbO_3 from 38 to 1200 K
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X-ray and Neutron Diffuse Scattering in LiNbO_3 from 38 to 1200 K

机译：LiNbO_3在38至1200 K范围内的X射线和中子扩散散射

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摘要

A semi-quantitative description of X-ray and neutron diffuse scattering from congruent lithium niobate, LiNbO3, is given. The diffuse scattering is concentrated in three sets of diffuse planes perpendicular to _ the pseudo-cubic symmetry-related [221], [241] and [421] directions and can be attributed to one-dimensional displacive and chemical disorder along these directions. The variation of the X-ray and neutron diffuse intensities with the scattering vector, as well as the comparison between X-ray and neutron data, indicate that more than one type of atom is involved. Temperature variations are followed from 38 to 1200 K. Different disorder models are discussed. The increase of the integrated intensities of the diffuse lines along the [01k2l]* and [01fc4l]* directions {i.e. sections of the diffuse planes) up to 800 K followed by a slight decrease at higher temperatures may be interpreted either by static disorder related to temperature-dependent variation of disorder/defect clusters or by dynamic disorder. Inelastic neutron scattering experiments do not show any anomaly of the transversal acoustic (TA) modes.
机译：给出了来自全同铌酸锂LiNbO3的X射线和中子扩散散射的半定量描述。漫散射集中在垂直于伪立方对称相关的[221]，[241]和[421]方向的三组漫射平面中，并且可以归因于沿着这些方向的一维位移和化学无序。 X射线和中子扩散强度随散射矢量的变化以及X射线和中子数据之间的比较表明，涉及的原子类型不止一种。温度变化范围从38 K到1200K。讨论了不同的无序模型。沿着[01k2l] *和[01fc4l] *方向{i.e.的扩散线的积分强度的增加。扩散平面的最大截面）（最高800 K），然后在较高温度下略有下降，可能是由与无序/缺陷簇的温度相关变化有关的静态无序或由动态无序所解释的。非弹性中子散射实验没有显示出横向声（TA）模式的任何异常。

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