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Title:  Thermal and XRD studies of polycrystalline (Fe, Sr) TiO3 ceramics
Authors: Srivastava, K K P
Sinha, K K
Keywords: Ceramics
Differential scanning calorimetry
Ferroelectrics
SrTiO3
XRD
Issue Date: Oct-2004
Publisher: CSIR
IPC CodeG01N 33/38
Abstract:  Ferroelectrics of ABO3 type perovskite structure like PbTiO3 and BaTiO3, and those synthesized with a varied concentration of other divalent, tetravalent and pentavalent atoms are important because of their application as dielectric materials and the study of phase change in such materials is interesting. In the same series SrTiO3 is cubic at room temperature with no ferroelectric property and it can serve as a reference lattice. Mössbauer, EPR and IR studies of FexSr1-xTiO3 (x ≤ 0.3) ceramics have indicated structural change. The variation of the specific heat with temperature shows a peak at around 157 K, which indicates phonons occupying two energy states and a phase change. The specific heat of 7.5 R deg-1 mole-1 at 500°C is much greater than 3R for simple elemental systems (metals), which indicates that other internal modes of vibrations are excited or anharmonic movements of atoms are present. The XRD intensity peaks are quite sharp that indicates that samples are made of well-grown crystallites mostly in single phase. The samples have orthorhombic structure though there are significant changes in unit cell volumes. For example, the sample with x = 0.3 has a = 6.3853, b = 4.7769 Å, c = 3.9039 Å.
Page(s): 745-748
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(10) [October 2004]

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