Structural Origin of Thermally Induced Second Harmonic Generation Enhancement in RbNaMgP2O7

被引：21

作者：

Yang, Xiaoyan ^{[1
]}

Zhao, Sangen ^{[2
]}

Geng, Shipeng ^{[1
]}

Yang, Li ^{[1
]}

Huang, Qingzhen ^{[3
]}

Kuang, Xiaojun ^{[1
]}

Luo, Junhua ^{[2
]}

Xing, Xianran ^{[4
,5
]}

机构：

[1] Guilin Univ Technol, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Guangxi Key Lab Opt & Elect Mat & Devices, Coll Mat Sci & Engn, Guilin 541004, Peoples R China

[2] Chinese Acad Sci, State Key Lab Struct Chem, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China

[5] Univ Sci & Technol Beijing, Inst Solid State Chem, Beijing 100083, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2019年 / 31卷 / 23期

基金：

中国国家自然科学基金;

关键词：

NONLINEAR-OPTICAL MATERIAL; RB; CONDUCTIVITY; CRYSTALS; SHOW; UV;

D O I：

10.1021/acs.chemmater.9b03971

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：

RbNaMgP2O7 is a newly reported nonlinear optical (NLO) crystal that displays remarkable second harmonic generation (SHG) enhancement upon heating. In this work, we carried out in situ neutron powder diffraction and impedance spectroscopy measurements through its polar-to-polar phase-transition region and confirmed that the dynamic process for the alignment of NLO-active anionic [P2O7](4-) groups is composed of thermo-induced incremental rotation of [P2O7](4-) groups, which is accompanied by cationic migration enhancement. Furthermore, we elucidated a new mechanism of coupling between anionic group alignment and cationic migration for the first time in NLO materials. This mechanism could offer extra freedom for new NLO material design and anionic group alignment control for a better SHG response via tuning the cationic migration.

引用

页码：9843 / 9849

页数：7

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