STRUCTURE CORRELATED INFRARED PROPERTIES OF FLUORIDE FILMS

被引：5

作者：

LEHMANN, A ^{[1
]}

HEERDEGEN, W ^{[1
]}

SCHIRMER, G ^{[1
]}

MUTSCHKE, H ^{[1
]}

RICHTER, W ^{[1
]}

HACKER, E ^{[1
]}

DOHLE, R ^{[1
]}

机构：

[1] CARL ZEISS JENA, O-6900 JENA, GERMANY

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 1990年 / 119卷 / 02期

关键词：

D O I：

10.1002/pssa.2211190233

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

BaF2, PbF2, and CaF2 films are investigated by IRAS (infrared reflection absorption spectroscopy), ATR (attenuated total reflection), IR transmission measurements, and IR ellipsometry. Interesting features of their spectra particularly occur near 300, 1500, and 3000 cm−1. These absorptions are due to intrinsic modes, hydroxyl, and methylen, respectively. The frequencies of the vibrational modes are related to the film material, but also to its history. The so called longitudinal optical frequencies roughly coincide with corresponding values for the cubic modifications of the fluorides, where the F ions are tetrahedrically surrounded by four nearest neighbour metal ions. Polarization dependent measurements hint at an anisotropic incorporation of water molecules in some cases. According to the lower melting point of PbF2 its water content can be reduced by heating above 373 K more quickly than it is possible for BaF2 films. This is proved by ATR measurements. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA

引用

页码：683 / 688

页数：6

共 8 条

[1] INFRARED ABSORPTION AT LONGITUDINAL OPTIC FREQUENCY IN CUBIC CRYSTAL FILMS [J].