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首页> 外文期刊>Crystallography reports >On the effect of structural and symmetrical features of potassium titanyl phosphate crystals with different contents of niobium, antimony, and zirconium on the second-harmonic intensity
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On the effect of structural and symmetrical features of potassium titanyl phosphate crystals with different contents of niobium, antimony, and zirconium on the second-harmonic intensity

机译：铌，锑，锆不同含量的钛氧基磷酸氧钛钾晶体的结构对称特征对二次谐波强度的影响

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摘要

A model is proposed, which shows that, at small deviations from the centrosymmetric state of the atomic structure, the quadratic nonlinear susceptibility of a crystal monotonically decreases with approach of the degree of central symmetry [. ( r)] of the electric potential function of the crystal structure to unity. The quadratic nonlinear susceptibility of K 1 - x Ti 1 - x Nb x OPO 4 ( x = 0, 0.02, 0.04, 0.11), K 1 - x Ti 1 - x Sb x OPO 4 ( x = 0.01, 0.07, 0.17), and KTi 1 - x Zr x OPO 4 ( x = 0.03, 0.04) crystals has been measured. The degree of central symmetry [. ( r)] has been calculated for the structures of K 1 - x Ti 1 - x Nb x OPO 4 ( x = 0, 0.04, 0.11), K 1 - x Ti 1 - x Sb x OPO 4 ( x = 0.01, 0.07, 0.17), and KTi 1 - x Zr x OPO 4 ( x = 0.03, 0.04) crystals. It is shown that, at [. ( r)] > 0.7, the relationship between the quadratic nonlinear susceptibility of the investigated crystals and the degree of their central symmetry [. ( r)] is in qualitative agreement with the proposed model.
机译：提出了一个模型，该模型表明，在偏离原子结构中心对称状态的微小偏差下，晶体的二次非线性磁化率随中心对称度的接近而单调降低。 （r）]使晶体结构的电位函数统一。 K 1-Ti 1-x Nb x OPO 4（x = 0，0.02，0.04，0.11），K 1-x Ti 1-x Sb x OPO 4（x = 0.01，0.07，0.17）的二次非线性磁化率，并且已经测量了KTi 1-x Zr x OPO 4（x = 0.03，0.04）晶体。中心对称度[。 （r）]已计算出K 1-x Ti 1-x Nb x OPO 4（x = 0，0.04，0.11），K 1-x Ti 1-x Sb x OPO 4（x = 0.01， 0.07，0.17）和KTi 1-x Zr x OPO 4（x = 0.03，0.04）晶体。如图所示。 （r）]> 0.7，则所研究晶体的二次非线性磁化率与其中心对称度之间的关系[。 （r）]与提议的模型在质量上一致。

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