Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/12955
Title: Effect of lead content on structural and <i>dc </i>electrical conductivity of perovskite Ca<sub>X</sub>Pb<sub>(1</sub><sub>-X)</sub>TiO<sub>3</sub> (CPT) ceramic
Authors: El-Mallah, H M
Keywords: (Ca, Pb)TiO<sub>3</sub>
Structural
Perovskites
<i>dc</i> conductivity
Ceramics
Issue Date: Nov-2011
Publisher: NISCAIR-CSIR, India
Abstract: Ceramic compositions of complex perovskite Ca<sub>X</sub>Pb<sub>(1</sub><sub>-</sub><sub>X)</sub>TiO<sub>3</sub> (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 (CaTiO<sub>3</sub> and PbTiO<sub>3</sub>). 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 PbTiO<sub>3</sub> decreases with increasing Ca content and disappears at the composition Ca<sub>0.6</sub>Pb<sub>0.4</sub>TiO<sub>3</sub>. The density, molar volume, atomic concentration and the atomic intermediate distance have been determined. The <i>dc. </i>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 <i>T</i><sub>C</sub> was deduced by differential thermal analysis (DTA) and <i>dc</i> conductivity data. Semiconductor-semiconductor-metal type for the compositions of <i>x</i> = 1.0, 0.8, 0.7, 0.4 and 0.2 have been observed. While semiconductor-metal behaviour was observed for the compositions Ca<sub>0.6</sub>Pb<sub>0.4</sub>TiO<sub>3</sub> and PbTiO<sub>3</sub> in the temperature range <i>T</i><sub>SM</sub> = 260-370°C and 230-480°C, respectively.
Description: 769-775
URI: http://hdl.handle.net/123456789/12955
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(11) [November 2011]

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