Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 183, Issue 3, Pages 624-630Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2009.11.032
Keywords
Dielectrics; Electrical properties; Tetragonal tungsten bronze
Funding
- EPSRC
- EPSRC [EP/G005001/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G005001/1] Funding Source: researchfish
Ask authors/readers for more resources
The new phases Ba2LaMNb4O15 M=Mn, Fe were prepared by solid state reaction at 1100 degrees 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 degrees C and tan delta << 0 001 over the range 100-320 K and at 10(5) 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+. (C) 2010 Published by Elsevier Inc.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available