Optical non-linearity tuning in Ca8-xPbxMBi(VO4)7 whitlockite-type systems

被引：16

作者：

Beskorovaynaya, Daria A. ^{[1
,2
]}

Deyneko, Dina V. ^{[1
,3
]}

Baryshnikova, Oksana V. ^{[1
]}

Stefanovich, Sergey Yu. ^{[1
,4
]}

Lazoryak, Bogdan I. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia

[2] Gubkin Russian State Univ Oil & Gas, Dept Phys & Colloid Chem, Moscow 119991, Russia

[3] Shubnikov Inst Crystallog RAS, Moscow 119333, Russia

[4] L Ya Karpov Inst Phys Chem, Moscow 105064, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 674卷

基金：

俄罗斯基础研究基金会;

关键词：

Crystal structure; X-ray diffraction; Nonlinear optics; Phase transitions; SPECTRAL PROPERTIES; LASER CRYSTAL; SOLID-SOLUTIONS; GROWTH; LUMINESCENCE; BI; PHOTOLUMINESCENCE; CA-3(VO4)(2); PHOSPHOR; LA;

D O I：

10.1016/j.jallcom.2016.02.218

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ca8-xPbxMBi(VO4)(7), M2+ = Mg2+, Zn2+ (0 <= x <= 1.5) and M2+ = Ca2+, Cd2+ (0 <= x <= 2) solid solutions with whitlockite-type structure have been prepared by solid state reactions in the form of powders and ceramics. Ferroelectric phase transitions (FPT) are revealed in the cause of dielectric, calorimetric and temperature second harmonic generation (SHG) investigations. It is found that ferroelectric Curie points in solid solutions decrease with x from 1000-1070 K to 730-800 K. The intensity of SHG firstly increases with x and then decreases, the highest SHG signal belongs to Ca7PbCdBi(VO4)(7) and Ca6.5P1.5CdBi(VO4)(7). Variation of Pb2+ concentration is shown to have a minor influence on the coherence length, therefore the SHG augmentation in solid solutions is attributed to optical nonlinear coefficient < d >. The structure of Ca6.5Pb1.5MgBi(VO4)(7) is resolved and crystal structure changes in solid solutions are analyzed. The results are interpreted in view of site occupancy by two- and trivalent cations and their influence on formation of spare space essential for Pb2+ and Bi3+ non-bonded electrons stereo-activity in whitlockite-type crystal structures. For the first time contribution to optical nonlinearity from VO43- anionic groups in different positions is also discussed. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：323 / 330

页数：8

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