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

Chandra, Amreesh ; Pandey, Dhananjai ; Mathews, M. D. ; Tyagi, A. K. (2005) Large negative thermal expansion and phase transition in (Pb1-xCax)TiO3 (0.30 ≤ x ≤ 0.45) ceramics Journal of Materials Research, 20 (02). pp. 350-356. ISSN 0884-2914

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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.

Item Type:Article
Source:Copyright of this article belongs to Cambridge University Press.
Keywords:Ceramic; Dielectric Properties; X-ray Diffraction (XRD)
ID Code:88734
Deposited On:29 Mar 2012 14:42
Last Modified:29 Mar 2012 14:42

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