Accession Number : AD0447460

Title :   INFRARED STUDIES OF PEROVSKITE TITANATES,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE SPECTROSCOPY LAB

Personal Author(s) : Perry,C. H. ; Khanna,B. N. ; Rupprecht,G.

Report Date : 09 MAR 1964

Pagination or Media Count : 5

Abstract : The infrared reflection and transmission spectra of CaTiO3, SrTiO3, and PbTiO3 have been measured from 1/4000 to 1/30 cm at room temperature. The reflection data have been analyzed by means of a Kramers-Kronig method, from which the frequencies of the normal optically active vibrations were derived in agreement with data obtained from transmission spectra. Three infrared active vibrations were observed for cubic SrTiO3 as required by group theory. However, in the case of CaTiO3 and PbTiO3 which crystallize as slightly distorted perovskite structures to become orthorhombic and tetragonal, respectively, additional bands were found which had not been observed previously. These distortions from ideal cubic symmetry would split degenerate modes to possibly give additional frequencies. The results are compared with those of other workers. (Author)

Descriptors :   (*TITANATES, INFRARED SPECTROSCOPY), CALCIUM COMPOUNDS, STRONTIUM COMPOUNDS, LEAD COMPOUNDS, VIBRATION, ABSORPTION SPECTRA, RUTILE, RAMAN SPECTROSCOPY

Distribution Statement : APPROVED FOR PUBLIC RELEASE