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Title: Enhanced microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics doping by metal Fe powders

Abstract

Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics by adding mental Fe powders have been fabricated via the solid-state reaction method. The microstructures and optical properties of samples are systematically studied in order to establish the effects of Fe powder additives on microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics by x-ray diffraction, x-ray photoelectron spectroscopy, and optical reflective spectrum. The results show the coexistence of Fe{sup 2+} and Fe{sup 3+} in Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics, the decrease of O vacancy concentrations, and their incorporation into the B-site (Ti) of the Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} host lattice give rise to excellent microwave dielectric properties. All samples have a higher Q value above 290 while maintaining relatively high tunability above 16.6%. In particular, the sample with the composition of x = 0.035 mol has the dielectric constant of 889, Q Multiplication-Sign f value of 826 (at 1.370 GHz), and tunability of 24%, which are very promising for high power tunable devices. In comparison, Fe{sub 2}O{sub 3} oxide doped Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics with the same molar ratios of Fe exhibit inferior microwave properties. It indicates that additives of the metal Fe powders can more effectively improve dielectric properties of Ba{sub x}Sr{submore » 1-x}TiO{sub 3} system than Fe{sub 2}O{sub 3} oxide.« less

Authors:
 [1];  [2]; ;  [1];  [3];  [4]
  1. Functional Materials Research Laboratory, Tongji University, 1239 Siping Road, Shanghai 200092 (China)
  2. (China)
  3. Institute of Quality Inspection of Electronic and Electrical Appliances and Household Electrical Appliances Presentation, 627 Yong Jia Road, Shanghai 200031 (China)
  4. Agilent Technologies Co., Ltd, 690 Bibo Road, Shanghai 201203 (China)
Publication Date:
OSTI Identifier:
22089547
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; CERAMICS; CRYSTALS; DOPED MATERIALS; IRON ADDITIONS; IRON OXIDES; MICROSTRUCTURE; MICROWAVE RADIATION; PERMITTIVITY; POWDERS; Q-VALUE; REFLECTIVITY; RISE; SPECTRA; STRONTIUM COMPOUNDS; TITANATES; VACANCIES; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Zhang Qiwei, School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, Zhai Jiwei, Yao Xi, Ben Qianqian, and Yu Xian. Enhanced microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics doping by metal Fe powders. United States: N. p., 2012. Web. doi:10.1063/1.4766276.
Zhang Qiwei, School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, Zhai Jiwei, Yao Xi, Ben Qianqian, & Yu Xian. Enhanced microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics doping by metal Fe powders. United States. doi:10.1063/1.4766276.
Zhang Qiwei, School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, Zhai Jiwei, Yao Xi, Ben Qianqian, and Yu Xian. Thu . "Enhanced microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics doping by metal Fe powders". United States. doi:10.1063/1.4766276.
@article{osti_22089547,
title = {Enhanced microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics doping by metal Fe powders},
author = {Zhang Qiwei and School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010 and Zhai Jiwei and Yao Xi and Ben Qianqian and Yu Xian},
abstractNote = {Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics by adding mental Fe powders have been fabricated via the solid-state reaction method. The microstructures and optical properties of samples are systematically studied in order to establish the effects of Fe powder additives on microwave dielectric properties of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics by x-ray diffraction, x-ray photoelectron spectroscopy, and optical reflective spectrum. The results show the coexistence of Fe{sup 2+} and Fe{sup 3+} in Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics, the decrease of O vacancy concentrations, and their incorporation into the B-site (Ti) of the Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} host lattice give rise to excellent microwave dielectric properties. All samples have a higher Q value above 290 while maintaining relatively high tunability above 16.6%. In particular, the sample with the composition of x = 0.035 mol has the dielectric constant of 889, Q Multiplication-Sign f value of 826 (at 1.370 GHz), and tunability of 24%, which are very promising for high power tunable devices. In comparison, Fe{sub 2}O{sub 3} oxide doped Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} ceramics with the same molar ratios of Fe exhibit inferior microwave properties. It indicates that additives of the metal Fe powders can more effectively improve dielectric properties of Ba{sub x}Sr{sub 1-x}TiO{sub 3} system than Fe{sub 2}O{sub 3} oxide.},
doi = {10.1063/1.4766276},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 10,
volume = 112,
place = {United States},
year = {2012},
month = {11}
}