Oxide ion conductivity in some substituted rare earth pyrozirconates

Govindan Kutty, K. V. ; Mathews, C. K. ; Rao, T. N. ; Varadaraju, U. V. (1995) Oxide ion conductivity in some substituted rare earth pyrozirconates Solid State Ionics: Diffusion and Reactions, 80 (1-2). pp. 99-110. ISSN 0167-2738

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/016727...

Related URL: http://dx.doi.org/10.1016/0167-2738(95)00127-R


This paper reports oxide ion conductivity measurements on pyrozirconates of neodymium and gadolinium in which the rare earth elements were partially substituted by strontium, and zirconium partially substituted by aluminium. 5-10 atom% Sr and very little Al were found to enter the pyrochlore lattice, ac impedance measurements have shown an enhancement of conductivity as a result of the incorporation of small amounts of Sr in both the pyrochlores. In the Gd2Zr2O7 system, this could be traced to an improvement of the grain interior conductivity, by resolving the grain interior and grain boundary contributions to the total conductivity. Such a separation of the bulk and grain boundary conductivities could not be achieved in the Nd2Zr2O7-based compositions. The observed variations in conductivity are explained in terms of the pyrochlore crystal chemistry.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ionic Conductivity - Oxygen; Impedance Spectroscopy; Pyrozirconates; Substitution
ID Code:25397
Deposited On:06 Dec 2010 13:27
Last Modified:06 Jun 2011 11:12

Repository Staff Only: item control page