TITLE:
Crystal Structure of BaxSr1-xTiO3 Fine Powder
AUTHORS:
Natheer B. Mahmood, Emad K. Al-Shakarchi, Brahim Elouadi, Xavier Feaugas
KEYWORDS:
Barium Strontium Titanate, Oxalate Co-Precipitation Method, X-Ray Diffraction, Transmission Electron Microscope, Ultra-Fine Powder
JOURNAL NAME:
Journal of Modern Physics,
Vol.6 No.1,
January
28,
2015
ABSTRACT: Various compositions of the system BaxSr1-xTiO3 (BST) have been elaborated both as fine powders and ceramic monoliths, using
the co-precipitation
route within a warmed supersaturated solution of oxalic acid. The appropriate
stoichiometry was determined from the mixtures of precisely titrated aqueous
solutions of cations chlorides (SrCl2, BaCl2, and TiCl4).
The reason of this process was to apply low sintering temperature in production
of BST samples with ultra-fine powders. These powders primarily calcined at
(850°C) for (5 hr) were used to elaborate ceramics after pellets sintering at
(1200°C) during (8 hrs). Indeed, XRD patterns were confirmed that the samples
are a pure phase and a perovskite cubic structural type at (x = 0, 0.5, 0.6). Whereas,
(x = 0.7, 0.8, 0.9, 1) showed a tetragonal phase. There is agreement between
the FTIR and XRD analysis, by the relation of the wave vector (K) and lattice
constant. It was deduced a stimulated relation between (x) and (K). The results
of TEM, they were clear that the lowest particle sizes investigated of BST
powders nearly (36 - 50 nm).