Preparation of a New Strontium Titanium Sulfide SrxTiS3 (x = 1.05 - 1.22) with Infinitely Adaptive Structures

Abstract

A new strontium titanium sulfide, SrxTiS3, has been prepared by the reaction of CS2 with a mixture of SrCO3 and TiO2. The powder X-ray diffraction and the electron diffraction patterns showed that it has infinitely adaptive structures (or vernier structures) similar to BaxFe2S4. The crystal structure can he described as interpenetration of two subcells having a common a and two different c axes in a hexagonal selling of trigonal symmetry. One of the lattice dimensions along c, c1, is from the TiS3 part and another, c2, is from the Sr part. In the composition range between x = 1.05 and x = 1.22 in SrxTiS3, the c1 expands while the c2 shrinks with increasing x value. The X-ray diffraction peaks could be indexed using four integers.