Solid solubilities of (La,Nd)2(Zr,Ti)2O7 phases deduced by neutron diffraction

Harvey, E. J. and Whittle, K. R. and Lumpkin, G. R. and Smith, R. I. and Redfern, S. A. T. (2005) Solid solubilities of (La,Nd)2(Zr,Ti)2O7 phases deduced by neutron diffraction. Journal of Solid State Chemistry, 178 (3). pp. 800-810. DOI 10.1016/j.jssc.2004.12.030

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Abstract

Time-of-flight powder neutron diffraction has been performed on oxides with composition (La1−xNdx)2Zr2O7 and Nd2(Zr1−xTix)2O7, where x=0, 0.2, 0.4,…1.0, in order to determine the solid solution behaviour across each series. Between La2Zr2O7 and Nd2Zr2O7, a cubic pyrochlore phase is observed (View the MathML source, Z=8). A linear decrease in the lattice parameter from 10.8047 to 10.6758 Å indicates complete miscibility of the two end-members. For the same series, the 48f oxygen x-parameter increases from 0.3313 to 0.3348, suggesting increased distortion of the 6 coordinate B sites and reduced distortion of the 8 coordinate A sites. There is limited solubility of Nd2Ti2O7 in Nd2Zr2O7. Exsolution of a monoclinic phase (P21, Z=8) rich in Nd2Ti2O7 is observed at approximately x=0.56. The compositional range over which a solid solution exists is more extensive than that which has been previously reported. The solubility of Nd2Zr2O7 in Nd2Ti2O7 is very low.

Item Type: Article
Uncontrolled Keywords: 2005 PUBL 2005 AREP IA46 IA47
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Solid State Chemistry
Volume: 178
Page Range: pp. 800-810
Identification Number: 10.1016/j.jssc.2004.12.030
Depositing User: Sarah Humbert
Date Deposited: 31 May 2011 09:53
Last Modified: 23 Jul 2013 09:58
URI: http://eprints.esc.cam.ac.uk/id/eprint/1670

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