Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Structure and Microwave Dielectric Properties in the x Ca2AlNbO6: (1-x) Ca3Nb2O8 System

Published

Author(s)

Julia Y. Chan, Terrell A. Vanderah, Robert S. Roth, Winnie Wong-Ng, B A. Reisner, Richard G. Geyer

Abstract

The structure and dielectric properties of bulk ceramics in the xCa2AlNbO6: (1-x)Ca3Nb2O8 system were studied. Ca2AlNbO6 (P21/n, a = 5.3785(1) , b = 5.4158(1) , c = 7.6259(1) , b = 89.93(1)o) is a double perovskite with structure similar to CaTiO3 and Ca3Nb2O8 is a defect perovskite-related phase (a = 23.803(1) ). The end members exhibit temperature coefficients of resonant frequency (Df) that are opposite in sign; therefore, compositions along the tie linebetween them were prepared to examine the dielectric properties. Materials in this system exhibit modest relative permittivities (24 < er < 39) and low dielectric loss (7000 < Q x f < 14000 at 6 GHz). At the composition near x = 0.6, the relative permittivity is 26 with Df near 0 ppm at 7 GHz. Synthesis, structural characterization from single-crystal X-ray and powder neutron diffraction, and the dielectric properties of the phases will be described.
Proceedings Title
Sigma Xi Post Doctoral Poster Presentations, 2000
Conference Dates
February 17-18, 2000
Conference Location
washington, DC, US
Conference Title
Sigma Xi Web Page

Keywords

ceramics, dielectric properties, perovskite

Citation

Chan, J. , Vanderah, T. , Roth, R. , Wong-Ng, W. , Reisner, B. and Geyer, R. (2000), Structure and Microwave Dielectric Properties in the x Ca<sub>2</sub>AlNbO<sub>6</sub>: (1-x) Ca<sub>3</sub>Nb<sub>2</sub>O<sub>8</sub> System, Sigma Xi Post Doctoral Poster Presentations, 2000, washington, DC, US (Accessed December 13, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created January 31, 2000, Updated October 12, 2021