热稳定性
堆积
结晶学
聚合
热液循环
吸收(声学)
二次谐波产生
材料科学
吸收光谱法
谱线
分析化学(期刊)
化学
光学
有机化学
物理
聚合物
化学工程
工程类
复合材料
天文
激光器
作者
Xiang Xu,Chun‐Li Hu,Bingxuan Li,Bing‐Ping Yang,Jiang‐Gao Mao
摘要
Two new noncentrosymmetric isomeric silver polyiodates, namely, α-AgI3O8 (Pnc2) and β-AgI3O8 (I4̅), have been synthesized through the hydrothermal reactions of AgNO3 with I2O5. Both isomers exhibit layered structures that are constructed from I3O8– anions interconnected by Ag+ cations. The main structural difference between the two isomers lies in the different stacking fashions of [AgI3O8] layers along the c axis in order to meet the requirements of their space groups. Powder second-harmonic generation (SHG) measurements indicate that α-AgI3O8 and β-AgI3O8 are both phase-matchable materials with large SHG responses of approximately 9.0 and 8.0 times that of KH2PO4, respectively. UV–vis–NIR transmission spectra show that the cutoff absorption edges are 328 nm for α-AgI3O8 and 345 nm for β-AgI3O8. Thermal stability studies demonstrate that both isomers are thermally stable up to about 370 °C. Theoretical calculations based on DFT methods for the two AgI3O8 phases as well as the NaI3O8 analogue have been performed.
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