Accession Number : AD0271743

Title :   E.S.R. IN THE LANTHANON HEXA-ANTIPYRENE IODIDES

Corporate Author : OXFORD UNIV (ENGLAND) CLARENDON LAB

Personal Author(s) : BAKER,J.M. ; RUBINS,R.S.

Report Date : JUN 1961

Pagination or Media Count : 1

Abstract : The lanthanon HAP iodides appear to undergo a crystalline distortion at low temperatures in which the C sub 3v point symmetry at each lanthanon site changes to one of lower symmetry. The transition temperature depends in undiluted salts upon the size of the lanthanon ion, and in diluted salts upon the size of the host rather than the impurity lanthanon ion. Of the observed esr spectra only those of Gd(3+) and Ce(3+) can be seen above the transition temperature. It has not been possible from the resonance data to make unambiguous estimates of either the ground state or the crystalline field parameters. (Author)

Descriptors :   *IODIDES, *LANTHANUM COMPOUNDS, CRYSTAL STRUCTURE, IMPURITIES, IONIZATION, NUCLEAR RESONANCE, PHOTOGRAPHIC ANALYSIS, SALTS, SINGLE CRYSTALS, TEMPERATURE, TRANSITION TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE