MOSSBAUER SPECTROSCOPIC STUDY OF IODINE-INTERCALATED BI2SR2CACU2OY

Iodine-intercalated high-T-c oxide Bi(2)Sr(2)CaCu(2)O3(y) was studied at 16 K using I-129 Mossbauer effect. The Mossbauer spectrum shows the presence of Ig ions which have an almost linear structure and a symme trical charge population, and no other iodine species are found. In ad dition to the electronic structure of each iodine species, the analysi s of the intensity ratios of the quadrupole-split transitions reveals information about the anisotropy of the recoilless fraction for each i odine atom. It cannot exclude the possibility that the Ig ion is sligh tly asymmetrical and/or bent with consideration to small interactions between the I-3(-) ion and the neighboring Bi-O layers.