|
|||||
|
|
Microstructure and microwave dielectric characteristics of (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramics |
|
| Authors: | Wen-Cheng Tzou Yao-Sheng Yang Ho-Hua Chung Chien-Chen Diao |
| Affiliation: | a Department of Electro-Optical Engineering, Southern Taiwan University of Technology Yung-Kang City, Tainan, Taiwan, ROC b Department of Electronic Engineering, Kao Yuan University, Kaohsiung, Taiwan, ROC c Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan, ROC d Department of Mechanical and Automation Engineering, Kao Yuan University, Kaohsiung, Taiwan, ROC e Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan, ROC |
| Abstract: | (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 (0.1 ≤ x ≤ 0.85) composites are prepared by mixing 1150 °C-calcined BaTi4O9 with 1150 °C-calcined Ba(Zn1/3Ta2/3)O3 powders. The crystal structure, microwave dielectric properties and sinterabilites of the (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramics have been investigated. X-ray diffraction patterns reveal that BaTi4O9, ordered and disordered Ba(Zn1/3Ta2/3)O3 phases exist independently over the whole compositional range. The sintering temperatures of (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramics are about 1240 - 1320 °C and obviously lower than those of Ba(Zn1/3Ta2/3)O3 ceramics. The dielectric constants (?r) and the temperature coefficient of resonant frequency (τf) of (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramics increase with the increase of BaTi4O9 content. Nevertheless, the bulk densities and the quality values (Q × f) of (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramics increase with the increase of Ba(Zn1/3Ta2/3)O3 content. The results are attributed to the higher density and quality value of Ba(Zn1/3Ta2/3)O3 ceramics, the better grain growth, and the densification of sintered specimens added a small BaTi4O9 content. The (1 − x)Ba(Zn1/3Ta2/3)O3-xBaTi4O9 ceramic with x = 0.1 sintered at 1320 °C exhibits a ?r value of 31.5, a maximum Q × f value of 68500 GHz and a minimum τf value of 4.1 ppm/°C. |
| Keywords: | A Ceramics C X-ray diffraction D Dielectric properties |
| 本文献已被 ScienceDirect 等数据库收录！ | |