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Structural conditionality of the piezoelectric properties of langasite family crystals

机译:硅酸镧族晶体压电性质的结构条件。

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The atomic displacements upon isomorphic substitutions in crystals of the langasite family have been analyzed. The thermal parameters are determined and the probability density function of atoms is analyzed. Local potential energy minima are found which can be occupied by atoms under external effects. The contributions of cations in all four independent crystallographic positions and anions in all three such positions to the piezoelectric properties are established. One specific structural feature is the constant (at isomorphic substitutions) or possible (under external effects) but always opposite displacements of two cations along symmetry axis 2. Large cations in eight-vertex polyhedra make the main contribution to the piezoelectric properties. The cations in the tetrahedra on symmetry axis 2 weaken these properties. The cations in the octahedra in the origin of coordinates and in the tetrahedra on symmetry axes 3 only slightly affect the piezoelectricity.
机译:分析了硅酸镧族晶体中同构取代后的原子位移。确定热参数并分析原子的概率密度函数。发现局部势能极小值在外部作用下可被原子占据。建立了在所有四个独立的晶体学位置的阳离子和在所有三个这样的位置的阴离子对压电性能的贡献。一个特定的结构特征是恒定的(在同构置换中)或可能的(在外部作用下),但两个阳离子沿着对称轴2总是相反的位移。八顶点多面体中的大阳离子是压电性能的主要贡献。对称轴2上四面体中的阳离子削弱了这些特性。坐标原点的八面体中和对称轴3上的四面体中的阳离子仅对压电性产生轻微影响。

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