Skip to main content

New high permittivity tetragonal tungsten bronze dielectrics Ba2LaMNb4O15: M=Mn, Fe

McCabe, E.E., West, A.R. (2010) New high permittivity tetragonal tungsten bronze dielectrics Ba2LaMNb4O15: M=Mn, Fe. Journal of Solid State Chemistry, 183 (3). pp. 624-630. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2009.11.032) (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

The new phases Ba2LaMNb4O15: M=Mn, Fe were prepared by solid state reaction at 1100 °C. They have the tetragonal tungsten bronze structure, space group P4/mbm, at room temperature. The two octahedral sites show partial order of M and Nb with preferential occupancy of the smaller B(1) sites by M. Both phases have high permittivities 90±15 over the range 10-320 K. Ba2LaFeNb4O15 is highly insulating with bulk conductivity �10-8 ohm-1 cm-1 at 25 °C and tan δ�0.001 over the range 100-320 K and at 105 Hz. Solid solutions between these new phases and the compositionally and structurally related relaxor ferroelectric Ba2LaTi2Nb3O15 show gradual loss of ferroelectric behaviour attributed to replacement of polarisable Ti4+ by a mixture of (Mn, Fe)3+ and Nb5+. © 2010.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2009.11.032
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Dielectrics, Electrical properties, Tetragonal tungsten bronze, Bulk conductivities, Electrical property, High permittivity, New high, Octahedral sites, Partial order, Relaxor ferroelectric, Room temperature, Space Groups, Tetragonal tungsten bronze, Tetragonal tungsten-bronze structure, Barium, Ferroelectric materials, Ferroelectricity, Ionic conduction, Manganese, Manganese compounds, Permittivity, Solid state reactions, Tungsten, Bronze
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 09:56 UTC
Last Modified: 01 Aug 2019 10:38 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/47929 (The current URI for this page, for reference purposes)
McCabe, E.E.: https://orcid.org/0000-0001-5868-4570
  • Depositors only (login required):