Crystal structure and microwave dielectric properties of LiNb0.6Ti0.5O3 ceramics with Zn and Nb co-doped

•LiNb0.6Ti(0.5-x)(Zn1/3Nb2/3)xO3 (x = 0.06) obtain the best dielectric properties:εr = 72.1, Q × f = 5370 GHz (at 4 GHz), τf = 3.52 ppm/°C.•Effects of ion doping on phase composition, microstructure, lattice vibration, and microwave dielectric properties of the LNT ceramic were investigated.•It is f...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2022-11, Vol.285, p.115919, Article 115919
Main Authors: Ma, Fu-Song, Zeng, Qun, Feng, Yan-Zhao, Yao, Chun-Feng, Guo, Chao-Chao
Format: Article
Language:English
Subjects:
Bulk density
Ceramics
Crystal structure
Dielectric properties
High temperature
LiNb0.6Ti0.5O3
Microwave dielectric properties
Pattern analysis
Phase composition
Raman spectroscopy
Solid solutions
Substitutes
Titanium oxides
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•LiNb0.6Ti(0.5-x)(Zn1/3Nb2/3)xO3 (x = 0.06) obtain the best dielectric properties:εr = 72.1, Q × f = 5370 GHz (at 4 GHz), τf = 3.52 ppm/°C.•Effects of ion doping on phase composition, microstructure, lattice vibration, and microwave dielectric properties of the LNT ceramic were investigated.•It is found that (Zn1/3Nb2/3)4+ co-substituted Ti4+ can reduce the sintering temperature of LNT ceramics. The phase composition, microstructure, and microwave dielectric properties of the (Zn1/3Nb2/3)4+ substitution of Ti4+ in LiNb0.6Ti0.5O3 ceramics were systematically studied. The XRD pattern analysis results confirmed that Li1.075Nb0.625Ti0.45O3 solid solution single phase was formed in all components. Raman spectroscopy analysis showed that the substitution of (Zn1/3Nb2/3)4+ caused the expansion of the titanium oxide octahedral framework, and the increase in dielectric constant (εr) was attributed to the increase in bulk density and cation polarizability. The increase of oxygen vacancies after high-temperature sintering of doped ions has a negative impact on the quality factor (Q × f) value. As the doping content increases, the value of τf can continuously move to close to zero. LiNb0.6Ti(0.5-x)(Zn1/3Nb2/3)xO3 ceramic (x = 0.06) has good microwave dielectric properties when sintered at 1025 °C for 2 h: εr = 72.1, Q × f = 5370 GHz (at 4 GHz), τf = 3.52 ppm /°C.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2022.115919