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: | K. Ravindran Nair P. Prabhakar Rao S. Sameera Vinitha S. Mohan M.R. Chandran Peter Koshy |
| |
Affiliation: | aMaterials and Minerals Division, National Institute for Interdisciplinary Science and Technology, Trivandrum-695 019, India |
| |
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 °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 °C. Their temperature coefficient of dielectric constant (TCK) is negative, which varies from − 21 to − 220 ppm/°C. |
| |
Keywords: | Dielectrics Electroceramics X-ray techniques Powellite Low-temperature coefficient dielectrics |
本文献已被 ScienceDirect 等数据库收录! |
|