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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(11) [November 2011] >
| Title: | Effect of lead content on structural and dc electrical conductivity of perovskite CaXPb(1-X)TiO3 (CPT) ceramic |
| Authors: | El-Mallah, H M |
| Keywords: | (Ca, Pb)TiO3
Structural
Perovskites
dc conductivity
Ceramics |
| Issue Date: | Nov-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Ceramic compositions of complex perovskite CaXPb(1-X)TiO3 (CPT) systems with (x =1, 0.8, 0.7, 0.6, 0.4, 0.2 and 0) were prepared by mechanical mixing of their
oxides (CaTiO3 and PbTiO3). The structure of the (CPT)
ceramics was characterized by X-ray diffraction (XRD) not only to show the
quality of the composition, but also to determine structure of the system
and the lattice parameters. The effect of Pb on the local structure of the
seven ceramic samples (CPT) has been studied. The ceramics transform gradually
from orthorhombic phase (pseudo cubic phase) to cubic phase and to tetragonal
phase by increasing Pb content per cent. Tetragonality of PbTiO3
decreases with increasing Ca content and disappears at the composition Ca0.6Pb0.4TiO3. The density, molar volume, atomic
concentration and the atomic intermediate distance have been determined. The dc.
conductivity of the compositions measured in the temperature range
303-770 K obeys Arrhenius law. Temperature dependence of conductivity revealed
that the conductivity is thermally activated. The critical (phase transition)
temperature TC was deduced by differential thermal analysis
(DTA) and dc conductivity data. Semiconductor-semiconductor-metal type
for the compositions of x = 1.0,
0.8, 0.7, 0.4 and 0.2 have been observed. While semiconductor-metal behaviour was observed for the compositions Ca0.6Pb0.4TiO3 and
PbTiO3 in
the temperature range TSM = 260-370°C and 230-480°C, respectively. |
| Page(s): | 769-775 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(11) [November 2011]
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