Synthesis and X-ray powder diffraction data of Ba_(2.64)Ta_(11.25)O_(30.81)

摘要

The Ba_(2.64)Ta_(11.25)O_(30.81) was prepared by conventional solid-state reaction technique as a single phase. It was found that the compound crystallizes in the tetragonal system, space group PAImbm (No. 127) and unit-cell parameters are a = 12.508 59(8) A, c = 3.912 81(2) A, V= 612.218(7) A~3, and Z= 1. The crystal structure of the Ba_(2.64)Ta_(11.25)O_(30.81) phase is found to be closely related to the tetragonal tungsten bronze structure type, comprising interstitial (TaO)~+ inclusions. Reference data were derived from the Rietveld analysis and reported here.