X-ray, scanning electron microscopy and electrical properties of synthetic fresnoite (Ba2TiSi2O8) ceramics

Synthesis of Ba2TiOSi2O7 and Ba2TiOSi1.8Ge0.2O7 ferroelectric ceramics and the structure determination by Rietveld analysis

“…This impurity phase peak at 2u = 26.378 and 31.498 may be due to the formation of BaTiO 3 and TiO 2 which is within 5% of the total error and coming within the error limit. The detailed X-ray analysis of the pure compound was reported in our earlier paper [25]. Further analysis reveals that there is no impurity peak for substituted compound (Ba 2 TiOSi 1.8 Ge 0.2 O 7 ) in Rietveld refined pattern.…”

Synthesis, Structural, and Electrical Properties of Ca‐Modified Ba2TiSi2O8 Ceramics

“…A complete analysis of the bond lengths and bond angles are in progress and will be communicated separately. The detail description of the high activation energy value of the pure fresnoite compound has also been given on the basis of energy band model in our earlier paper 30 …”

Preparation and Electrical Properties of Ba2TiOSi2−xGexO7 (x=0.0 and 0.2) Ferroelectric Ceramics

“…When the Ge-ion is substituted in Si-site, the Si-O bond of high bond energy 452 kJ/mol breaks and makes a new bond Si-Ge of low bond energy 297 kJ/mol hence bond strength reduce and increases the conductivity of substituted compound. The detailed description of the high activation energy value of the pure fresnoite compound has been given on the basis of energy band model in our earlier paper [15]. Although there is a difference in conductivity of both samples, their small but finite conductivities have been taken into account to explain the ferroelectricity in the samples.…”