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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structure of strontium barium niobate SrxBa1-xNb2O6 (SBN) in the composition range 0.32 <= x <= 0.82
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Structure of strontium barium niobate SrxBa1-xNb2O6 (SBN) in the composition range 0.32 <= x <= 0.82

机译:组成范围0.32 <= x <= 0.82的铌酸锶钡SrxBa1-xNb2O6(SBN)的结构

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摘要

The structure of strontium barium niobate crystals SrxBa1-xNb2O6 is comprehensively studied in the whole range of the tetragonal tungsten bronze phase (x = 0.32-0.82) using both powder and single-crystal X-ray diffraction measurements. Unit-cell parameters, density, site-occupancy factors and interionic distances show an explicit composition dependence which can be consistently explained using simple model calculations. The temperature dependence of the unit-cell parameters exhibits a remarkable anisotropy in a broad temperature region below the phase transition temperature. This proves that the electrostrictive contribution to the thermal expansion plays an important role in strontium barium niobate.
机译:铌酸锶钡晶体SrxBa1-xNb2O6的结构在粉末状和单晶X射线衍射测量的整个四方钨青铜相(x = 0.32-0.82)范围内得到了全面研究。晶胞参数,密度,位点占用因子和离子间距显示出明显的成分依赖性,可以使用简单的模型计算来一致地解释。晶胞参数的温度依赖性在相变温度以下的宽温度范围内表现出显着的各向异性。这证明了电致伸缩对热膨胀的贡献在铌酸锶钡中起重要作用。

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