New powellite type oxides in Ca-R-Nb-Mo-O system (R=Y, La, Nd, Sm or Bi) - Their synthesis, structure and dielectric properties

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Title:	New powellite type oxides in Ca-R-Nb-Mo-O system (R=Y, La, Nd, Sm or Bi) - Their synthesis, structure and dielectric properties
Authors:	Raveendran Nair, K Prabhakar Rao, P Sameera, S Vinitha Mohan, S Chandran, M R Peter Koshy
Keywords:	Dielectrics Electroceramics X-ray techniques Powellite Low-temperature coefficient dielectrics
Issue Date:	2008
Publisher:	Elsevier
Citation:	Materials Letters 62(17-18):2868-2871;30 Jun 2008
Abstract:	New complex oxides having powellite (CaMoO4) type structure in the Ca-R-Nb-Mo-O system (R=Y, La, Nd, Sm or Bi) were prepared employing the method of solid state reaction between the component oxides at high temperature (1000-1100 degrees C). The new compounds, CaRNbMoO8 (R=Y, La, Nd, Sm, Bi) are colorless and electrical insulators. The dielectric constants (K at 1 MHz) of these compounds are in the range 14-33 and K shows very little variation in the temperature range 30-100 degrees C. Their temperature coefficient of dielectric constant (TCK) is negative, which varies from -21 to -220 ppm/°C.
URI:	http://ir.niist.res.in:8080/jspui/handle/123456789/1977
ISSN:	0167-577X
Appears in Collections:	2008

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