Lanthanide distribution in some doped alkaline earth aluminates and gallates

Saines, P.J. and Elcombe, M.M. and Kennedy, B.J. (2006) Lanthanide distribution in some doped alkaline earth aluminates and gallates. Journal of Solid State Chemistry, 179 (3). pp. 613-622. ISSN 00224596 (ISSN). (doi:https://doi.org/10.1016/j.jssc.2005.10.043) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.scopus.com/inward/record.url?eid=2-s2.0...

Abstract

High-resolution neutron and synchrotron X-ray powder diffraction studies are reported for the six oxides AB2O4 (A=Ca2+, Sr2+ and Ba2+ and B=Al3+ and Ga3+). These oxides all adopt a stuffed tridymite type structure, the precise nature of which depends on both the A- and B-type cations. Bond valence calculations reveal a range of values for the various A-type cations, in all cases at least one site is significantly underbonded. Conversely the tetrahedral B-type sites invariably exhibit unexceptional bond valencies. Attempts to dope the oxides with various lanthanides to the 1% level invariably resulted in some segregation into alternate phases located at the grain boundaries. The identity of the impurity phases is presented and the importance of bond valencies in understanding this segregation is highlighted.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia [Field not mapped to EPrints] AD - Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Alkaline earth, Aluminates, Gallates, Lanthanides, Neutron diffraction, Stuffed tridymites, X-ray diffraction, Crystal structure, Neutron diffraction, Positive ions, Synchrotrons, X ray diffraction, Alkaline earth, Aluminates, Gallates, Stuffed tridymites, Rare earth elements
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Paul Saines
Date Deposited: 07 Oct 2015 10:30 UTC
Last Modified: 07 Oct 2015 10:30 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50749 (The current URI for this page, for reference purposes)
  • Depositors only (login required):