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Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr)

Rawal, R., McQueen, A.J., Gillie, L.J., Hyatt, N.C., McCabe, E.E., Samara, K., Alford, N.M., Feteira, A., Reaney, I.M., Sinclair, D.C. and others. (2009) Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr). Applied Physics Letters, 94 (19). p. 192904. ISSN 00036951 (ISSN). (doi:10.1063/1.3129867) (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
https://doi.org/10.1063/1.3129867

Abstract

Rietveld refinement of room temperature (RT) neutron diffraction (ND) data reveals 12R -type hexagonal perovskites Ba3 LaNb3 O 12 (BLN) and Sr3 LaNb3 O12 (SLN) to adopt space group R 3- with tilted NbO6 octahedra. The presence of an octahedral tilt transition (Ttilt) at 465 K in BLN from R 3- to R 3- m is proposed from a combination of high temperature ND data and fixed frequency permittivity measurements. Ttilt is estimated to be much higher at â?¼720 K for SLN. The large difference in the RT temperature coefficient of the resonant frequency (Ï?f), -100 ppm/K for BLN compared to -5 ppm/K for SLN, is attributed to the closer proximity of Ttilt to RT for BLN. Ï?f in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore Ttilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O3 perovskites. © 2009 American Institute of Physics.

Item Type: Article
DOI/Identification number: 10.1063/1.3129867
Additional information: Unmapped bibliographic data: C7 - 192904 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Appl Phys Lett [Field not mapped to EPrints] AD - Department of Engineering Materials, Sir Robert Hadfield Building, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom [Field not mapped to EPrints] AD - School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, United Kingdom [Field not mapped to EPrints] AD - Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Fixed frequency, Hexagonal perovskite, High temperature, Microwave dielectric properties, NbO6 octahedra, Octahedral tilting, Resonant frequencies, Room temperature, Space Groups, Temperature coefficient, Tolerance factor, Barium, Dielectric properties, Natural frequencies, Permittivity measurement, Perovskite, Rietveld method, Rietveld refinement, Barium compounds
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Emma McCabe
Date Deposited: 10 Apr 2015 09:59 UTC
Last Modified: 01 Aug 2019 10:38 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/47931 (The current URI for this page, for reference purposes)
McCabe, E.E.: https://orcid.org/0000-0001-5868-4570
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