Raman Spectroscopy of Higher Titanate Phases in the BaTiO ₃ ‐TiO ₂ System

Abstract

Polytitanates in the BaO‐TiO 2 system with Ba: Ti ratios ranging from 1:2 to 1:5 were prepared employing the liquid mix technique. The samples were heated at 600° to 1300°C in oxygen, and Raman spectroscopy was used to investigate the phase relations in the system. The powders of various compounds were amorphous at temperatures less than 600°C. They crystallized into a single phase or a mixture of phases at 700°C. These mixtures underwent further phase transformation at higher temperatures to form single‐phase compounds. Details of the procedure for sample preparation and characterization of the products are described. The results from the present study are compared with previously published data.