Effects of Sm substitution on microwave dielectric properties of Ba 4La9.33(Ti0.95Zr0.05) 18O54 ceramics

Xufang Gao; Tai Qiu

doi:10.1016/j.jallcom.2010.01.033

Effects of Sm substitution on microwave dielectric properties of Ba ₄La_9.33(Ti_0.95Zr_0.05) ₁₈O₅₄ ceramics

Xufang Gao, Tai Qiu

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Sm substitution for La was investigated for the modification of Ba ₄La_9.33(Ti_0.95Zr_0.05) ₁₈O₅₄ ceramics. A single-phase solid solution with tungstenbronze-like structure formed in the whole range of y values in Ba ₄(La_1-ySm_y)_9.33(Ti _0.95Zr_0.05)₁₈O₅₄ ceramics. As Sm content increased, there was a constriction of the b-axis and c-axis, and decrease in the cell volume. The Qf value did not obey the mixing rules and it varied nonlinearly with composition y. Small levels of Sm substitution improved the Qf value with a decrease of dielectric constant. The temperature coefficient of resonant frequency varied from positive to negative and decreased continuously with the increase of Sm content. A near zero τ_f value (-2.38 × 10^-6/°C) was obtained at the composition of y = 0.7.

Original language	English
Pages (from-to)	333-337
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	502
Issue number	2
DOIs	https://doi.org/10.1016/j.jallcom.2010.01.033
State	Published - 23 Jul 2010

Keywords

Ceramics
Dielectric response
Microstructure
Rare earth alloys and compounds
Sintering

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10.1016/j.jallcom.2010.01.033

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title = "Effects of Sm substitution on microwave dielectric properties of Ba 4La9.33(Ti0.95Zr0.05) 18O54 ceramics",

abstract = "Sm substitution for La was investigated for the modification of Ba 4La9.33(Ti0.95Zr0.05) 18O54 ceramics. A single-phase solid solution with tungstenbronze-like structure formed in the whole range of y values in Ba 4(La1-ySmy)9.33(Ti 0.95Zr0.05)18O54 ceramics. As Sm content increased, there was a constriction of the b-axis and c-axis, and decrease in the cell volume. The Qf value did not obey the mixing rules and it varied nonlinearly with composition y. Small levels of Sm substitution improved the Qf value with a decrease of dielectric constant. The temperature coefficient of resonant frequency varied from positive to negative and decreased continuously with the increase of Sm content. A near zero τf value (-2.38 × 10-6/°C) was obtained at the composition of y = 0.7.",

keywords = "Ceramics, Dielectric response, Microstructure, Rare earth alloys and compounds, Sintering",

author = "Xufang Gao and Tai Qiu",

year = "2010",

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doi = "10.1016/j.jallcom.2010.01.033",

language = "英语",

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AU - Gao, Xufang

AU - Qiu, Tai

PY - 2010/7/23

Y1 - 2010/7/23

N2 - Sm substitution for La was investigated for the modification of Ba 4La9.33(Ti0.95Zr0.05) 18O54 ceramics. A single-phase solid solution with tungstenbronze-like structure formed in the whole range of y values in Ba 4(La1-ySmy)9.33(Ti 0.95Zr0.05)18O54 ceramics. As Sm content increased, there was a constriction of the b-axis and c-axis, and decrease in the cell volume. The Qf value did not obey the mixing rules and it varied nonlinearly with composition y. Small levels of Sm substitution improved the Qf value with a decrease of dielectric constant. The temperature coefficient of resonant frequency varied from positive to negative and decreased continuously with the increase of Sm content. A near zero τf value (-2.38 × 10-6/°C) was obtained at the composition of y = 0.7.

AB - Sm substitution for La was investigated for the modification of Ba 4La9.33(Ti0.95Zr0.05) 18O54 ceramics. A single-phase solid solution with tungstenbronze-like structure formed in the whole range of y values in Ba 4(La1-ySmy)9.33(Ti 0.95Zr0.05)18O54 ceramics. As Sm content increased, there was a constriction of the b-axis and c-axis, and decrease in the cell volume. The Qf value did not obey the mixing rules and it varied nonlinearly with composition y. Small levels of Sm substitution improved the Qf value with a decrease of dielectric constant. The temperature coefficient of resonant frequency varied from positive to negative and decreased continuously with the increase of Sm content. A near zero τf value (-2.38 × 10-6/°C) was obtained at the composition of y = 0.7.

KW - Ceramics

KW - Dielectric response

KW - Microstructure

KW - Rare earth alloys and compounds

KW - Sintering

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SN - 0925-8388

VL - 502

SP - 333

EP - 337

JO - Journal of Alloys and Compounds

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IS - 2

ER -

Effects of Sm substitution on microwave dielectric properties of Ba ₄La_9.33(Ti_0.95Zr_0.05) ₁₈O₅₄ ceramics

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