Issue 23, 2012

Structural dependence of microwave dielectric properties of ixiolite structured ZnTiNb2O8 materials: crystal structure refinement and Raman spectra study

Abstract

Structural and property relationships of ixiolite structured ZnTiNb2O8 microwave dielectric materials were studied by structure refinement and Raman spectra analysis. The vibration modes which have Raman activities of the ixiolite structure were assigned for the first time. The bands with wavenumbers greater than 450 cm−1 can be associated with several modes (Ag(2), B3g(1), B3g(2), Ag(1), B1g(2), Ag(3), B2g(2)) involving the stretching of the cation–O bonds. For wavenumbers between 250 and 450 cm−1, the bands are due, principally, to the bending of O–cation–O (B1g(1), B2g(1), B1g(3)). The origin of the bands with wavenumbers below 250 cm−1 would be lattice vibrations (B1g(4), Ag(4), B3g(4), B2g(4)), mainly associated with cation ions. The correlation between bond strength and packing fraction, Raman shift, full width at half maximum (FWHM) of Raman spectra were discussed. With increase of bond strength, the oxygen octahedron became rigid, the Raman shift increased, and the damping behavior became weaker. With increase of Raman shift, the dielectric constant decreased. With increase of packing fraction and decrease of FWHM, the Qf (quality factor × resonance frequency) value increased. The τf (temperature coefficient of resonance frequency) decreased with increase of bond strength. And there was no direct relationship between oxygen octahedron distortion and τf. The excellent microwave dielectric properties of ZnTiNb2O8 in this work were: dielectric constant (ε) = 34.4, Qf = 56 900 GHz, τf = −47.94 × 10−6/°C.

Graphical abstract: Structural dependence of microwave dielectric properties of ixiolite structured ZnTiNb2O8 materials: crystal structure refinement and Raman spectra study

Article information

Article type
Paper
Submitted
20 Dec 2011
Accepted
21 Mar 2012
First published
23 Mar 2012

Dalton Trans., 2012,41, 6963-6969

Structural dependence of microwave dielectric properties of ixiolite structured ZnTiNb2O8 materials: crystal structure refinement and Raman spectra study

Q. Liao and L. Li, Dalton Trans., 2012, 41, 6963 DOI: 10.1039/C2DT12451C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements