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

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774508040202· OSTI ID:22050948

Burdov, V A; Marychev, M O; Titaev, D N; Faddeev, M A; Chuprunov, E V ^[1]

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1. Nizhni Novgorod State University (Russian Federation)

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 {eta} {sub 1}[{phi}(r)] of the electric potential function of the crystal structure to unity. The quadratic nonlinear susceptibility of K{sub 1-x}Ti{sub 1-x}Nb{sub x}OPO{sub 4} (x = 0, 0.02, 0.04, 0.11), K{sub 1} {sub -x}Ti{sub 1-x}Sb{sub x}OPO{sub 4} (x = 0.01, 0.07, 0.17), and KTi{sub 1-x}Zr{sub x}OPO{sub 4} (x = 0.03, 0.04) crystals has been measured. The degree of central symmetry {eta} {sub 1}[{phi}(r)] has been calculated for the structures of K{sub 1-x}Ti{sub 1-x}Nb{sub x}OPO{sub 4} (x = 0, 0.04, 0.11), K{sub 1-x}Ti{sub 1-x}Sb{sub x}OPO{sub 4} (x = 0.01, 0.07, 0.17), and KTi{sub 1} {sub -x}Zr{sub x}OPO{sub 4} (x = 0.03, 0.04) crystals. It is shown that, at {eta} {sub 1}[{phi}(r)] > 0.7, the relationship between the quadratic nonlinear susceptibility of the investigated crystals and the degree of their central symmetry {eta} {sub 1}[{phi}(r)] is in qualitative agreement with the proposed model.

• OSTI ID: 22050948
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 4 Vol. 53; ISSN CYSTE3; ISSN 1063-7745
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIMONY
CRYSTAL STRUCTURE
CRYSTALS
NIOBIUM
PHOSPHATES
POTASSIUM
ZIRCONIUM