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Title: Structure analysis on the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} ceramics: Coexistence of order and disorder

Abstract

The Ba{sub 3}ZnTa{sub 2}O{sub 9} (BZT) and Ba{sub 3}MgTa{sub 2}O{sub 9} (BMT) ceramics, a family of A{sub 3}B{sup 2+}B{sup 5+}{sub 2}O{sub 9} complex perovskites, are extensively utilized in mobile based technologies due to their intrinsic high unloaded quality factor, high dielectric constant and a low (near-zero) resonant frequency temperature coefficient at microwave frequencies. The preparation conditions as well as size and nature of B cations have a profound effect on the final dielectric properties. In this article, we report the effect of Nb{sup 5+} at the Ta{sup 5+} site on the BMT structure prepared at four synthesis temperatures (1300, 1400, 1500 and 1600 deg. C). The analysis has been carried out using the Rietveld technique on the X-ray powder diffraction data. Results suggest that both the preparation temperatures and Nb{sup 5+} content have significant effect on the ordering of B cations in the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} solid solution. A disordered (cubic) structure is preferred by the 1300 deg. C compounds. The weight percentage of the ordered (trigonal) phase escalates, for a given composition, with increasing calcination temperature. A fully ordered trigonal arrangement exists only for x = 0.0 and 0.2 compounds calcined at 1600 deg. C, andmore » the rest are biphasic (cubic and trigonal). The increase in the cubic fraction upon Nb{sup 5+} augmentation suggests that the solid solution leans more toward the disordered structural arrangement of B{sup 2+} and B{sup 5+} cations.« less

Authors:
 [1];  [2]; ; ;  [3]
  1. WCCR, Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907-2009 (United States)
  2. (India), E-mail: janaswam@purdue.edu
  3. Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)
Publication Date:
OSTI Identifier:
21068219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 43; Journal Issue: 3; Other Information: DOI: 10.1016/j.materresbull.2007.04.009; PII: S0025-5408(07)00154-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; CALCINATION; CATIONS; CERAMICS; CRYSTAL STRUCTURE; MAGNESIUM COMPOUNDS; MICROWAVE RADIATION; NIOBIUM COMPOUNDS; NIOBIUM IONS; OXIDES; PERMITTIVITY; PEROVSKITES; QUALITY FACTOR; SOLID SOLUTIONS; SYNTHESIS; TANTALUM COMPOUNDS; TANTALUM IONS; TEMPERATURE COEFFICIENT; TEMPERATURE RANGE 1000-4000 K; X-RAY DIFFRACTION

Citation Formats

Janaswamy, Srinivas, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, Murthy, G. Sreenivasa, Dias, E.D., and Murthy, V.R.K.. Structure analysis on the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} ceramics: Coexistence of order and disorder. United States: N. p., 2008. Web. doi:10.1016/j.materresbull.2007.04.009.
Janaswamy, Srinivas, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, Murthy, G. Sreenivasa, Dias, E.D., & Murthy, V.R.K.. Structure analysis on the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} ceramics: Coexistence of order and disorder. United States. doi:10.1016/j.materresbull.2007.04.009.
Janaswamy, Srinivas, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, Murthy, G. Sreenivasa, Dias, E.D., and Murthy, V.R.K.. Tue . "Structure analysis on the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} ceramics: Coexistence of order and disorder". United States. doi:10.1016/j.materresbull.2007.04.009.
@article{osti_21068219,
title = {Structure analysis on the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} ceramics: Coexistence of order and disorder},
author = {Janaswamy, Srinivas and Department of Physics, Indian Institute of Technology Madras, Chennai 600036 and Murthy, G. Sreenivasa and Dias, E.D. and Murthy, V.R.K.},
abstractNote = {The Ba{sub 3}ZnTa{sub 2}O{sub 9} (BZT) and Ba{sub 3}MgTa{sub 2}O{sub 9} (BMT) ceramics, a family of A{sub 3}B{sup 2+}B{sup 5+}{sub 2}O{sub 9} complex perovskites, are extensively utilized in mobile based technologies due to their intrinsic high unloaded quality factor, high dielectric constant and a low (near-zero) resonant frequency temperature coefficient at microwave frequencies. The preparation conditions as well as size and nature of B cations have a profound effect on the final dielectric properties. In this article, we report the effect of Nb{sup 5+} at the Ta{sup 5+} site on the BMT structure prepared at four synthesis temperatures (1300, 1400, 1500 and 1600 deg. C). The analysis has been carried out using the Rietveld technique on the X-ray powder diffraction data. Results suggest that both the preparation temperatures and Nb{sup 5+} content have significant effect on the ordering of B cations in the Ba{sub 3}Mg(Ta{sub 1-x}Nb{sub x}){sub 2}O{sub 9} solid solution. A disordered (cubic) structure is preferred by the 1300 deg. C compounds. The weight percentage of the ordered (trigonal) phase escalates, for a given composition, with increasing calcination temperature. A fully ordered trigonal arrangement exists only for x = 0.0 and 0.2 compounds calcined at 1600 deg. C, and the rest are biphasic (cubic and trigonal). The increase in the cubic fraction upon Nb{sup 5+} augmentation suggests that the solid solution leans more toward the disordered structural arrangement of B{sup 2+} and B{sup 5+} cations.},
doi = {10.1016/j.materresbull.2007.04.009},
journal = {Materials Research Bulletin},
number = 3,
volume = 43,
place = {United States},
year = {Tue Mar 04 00:00:00 EST 2008},
month = {Tue Mar 04 00:00:00 EST 2008}
}