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Large negative thermal expansion and phase transition in (Pb1−xCax)TiO3 (0.30 ≤ x ≤ 0.45) ceramics

Published online by Cambridge University Press:  03 March 2011

Amreesh Chandra ,
Dhananjai Pandey ,
M.D. Mathews  and
A.K. Tyagi
Amreesh Chandra
Affiliation:
School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi-221005, India
Dhananjai Pandey*
Affiliation:
School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi-221005, India
M.D. Mathews
Affiliation:
Solid State Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400005, India
A.K. Tyagi
Affiliation:
Solid State Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400005, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

High-temperature dilatometric studies on (Pb1−xCax)TiO3 (x = 0.35, 0.35, 0.40, 0.45) ferroelectric ceramics reveal negative thermal expansion for x ≤ 0.40. The negative thermal expansion coefficient for x = 0.30, as obtained by dilatometry and powder x-ray diffraction, were found to be −8.541 × 10−6 K−1 and −11 × 10−6 K−1, respectively, which are comparable to those of other well-known negative thermal expansion materials like ZrW2O8, NaZr2(PO4)3. Results of temperature-dependent x-ray diffraction studies are also presented to show that the large negative thermal expansion behavior for x = 0.30 persists in a very wide range of temperatures, 70–570 K. Ca2+ substitution reduces the value of the negative thermal expansion coefficient of pure PbTiO3 crystal, but it enables the preparation of strong sintered ceramic bodies. The negative thermal expansion behavior is shown to disappear above the ferroelectric Curie point and is restricted to only the tetragonal compositions of (Pb1−xCax)TiO3.

Keywords

CeramicDielectric propertiesX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 350 - 356
Copyright
Copyright © Materials Research Society 2005

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