In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2018, No. 17 ( 2018-05-08), p. 1800-1804
Abstract:
We have prepared Ni 0.5 Ti 0.5 Nb 1– x Ta x O 4 microwave dielectric ceramics using a traditional solid‐state reaction method. The influence of Ta 5+ substituted at the Nb 5+ site on the crystal structures and dielectric properties of Ni 0.5 Ti 0.5 Nb 1– x Ta x O 4 ceramics is discussed. Structural refinement indicates that the distortion in the oxygen octahedron is affected by Ta substitution. The dielectric constant is dependent on the polarization of the NbO 6 octahedron. The Q × f value is improved as the Ta content increases, because of the increasing packing fractions. The τ f value is mostly dominated by distortions of the Nb–O bonds ( δ Nb–O ); and δ Nb–O reduces with increasing Ta ion doping in the Nb site, which makes the τ f value decrease with increasing Ta content. Optimal microwave dielectric properties ( ε r = 48.5, Q × f = 17500 GHz, and τ f = 88.6 ppm °C –1 at the resonant frequency of 6.05 GHz) are obtained for Ni 0.5 Ti 0.5 Nb 1– x Ta x O 4 ceramics at x = 0.2.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2018.17
DOI:
10.1002/ejic.201800016
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
1475009-0