額外添加Ba2+於(Ba,Ca)(Ti,Zr)O3系統的顯微結構、晶體結構及介電性質

謝宗諭

doi:10.6844/NCKU.2010.01915

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額外添加Ba2+於(Ba,Ca)(Ti,Zr)O3系統的顯微結構、晶體結構及介電性質

Microstructure, crystal structure, and dielectric property of (Ba,Ca)(Ti,Zr)O3 system synthesized with excess Ba2+

謝宗諭 , Masters　　Advisor：黃啟原　　

繁體中文 DOI： 10.6844/NCKU.2010.01915

鈦酸鋇； BCTZ ； BCTZC ； X8R ；介電常數； barium titanate ； BCTZ ； BCTZC ； X8R ； dielectric constant

Abstract │ Reference (36) │ Times Cited (19) │ Altmetrics

Abstract 〈TOP〉

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Due to the great performance of dielectric property, barium titanate was widely used in great number of high-K capacitor products, such as passive devices, multilayer ceramic capacitors, and thermistors. To make electric device reach the EIA’s industrial standard (X7R, Z5U, Y5V, etc), it’s necessary to add dopants into BaTiO3 proceeding ion exchanging or dopant to adjust the dielectric and temperature property. Single phase Ba0.95Ca0.05Ti0.88Zr0.12 (BCTZ) was obtained in this study by Ca2+ and Zr4+ doped into BaTiO3-based material, and (Ba,Ca)(Ti,Zr,Ca)O3 (BCTZC) was reacted of BCTZ system with excess of 0.04 and 0.06 mole of barium carbonate. In the study, we analyzed the material, structure and property analysis of both composition to realize the crystal structure and dielectric property’s affect when Ba2+ was occupied in Ti site.
As the result, single phase of BCTZ and BCTZC powder could be obtained under the calcined condition of 1200℃/4 h. The crystal structure of both was tetragonal phase which was analysed by XRD, Raman, and TEM diffraction pattern. Compared with BCTZ of XRD patterns, as the more amount of BaCO3 was added, d-spacing was raised by the observation of the lower angle of all the crystal planes. According to cell parameter calculation, a and c axis were increased after Ca2+ entered the Ti site, enlarged the volume of an unit cell and decreased the theory density.
After sintering under the condition of 1240℃/6 h and 1280℃/6 h, BCTZ and BCTZC sintered bulk’s relative density was 97%, 85% - 95%. The average grain size was about 4, 6 – 8 μm. Dielectric constant of BCTZ was about 2400 under 1 kHz condition and grain growth was observed at higher temperature with lower dielectric constant. BCTZC sintered bulk with 0.04 mole BaCO3 was nearby 4200 and rarely affect by the grain size, added with 0.06 mole BaCO3 was 6000 and decreased with lager grain. With Ca2+ occupied into Ti site after excess BaCO3 were added, curie temperature was lower when there was more BaCO3 doped and also the raise of dielectric constant at room temperature had been proved

Reference ( 36 ) 〈TOP〉

2. G. Shirane, F. Jona, and R. Pepinsky, “Some aspects of ferroelectricity,” Proc. I.R.E., 42, 1738-1793 (1955).
連結：
3. D. Hennings and A. Schnell, “Diffuse ferroelectric phase transitions in Ba(Ti1-yZry)O3 ceramics, ” J. Am. Ceram. Soc., 65 [11] 539-544 (1982).
連結：
4. J. Ravez, C. Broustera and A. Simon, “Lead-free ferroelectric relaxor ceramics in the BaTiO3–BaZrO3–CaTiO3 system,” J. Mater. Chem., 9 [7] 1609-1613 (1999).
連結：
5. H. Kishi, N. Kohzu, Y. Iguchi, J. Sugino, M. Kato, H. Ohsato, and T. Okuda, “Study of occupational sites and dielectric properties of Ho-Mg and Ho-Mn substituted BaTiO3,” Jpn. J. Appl. Phys., 39 [9B] 5533-5537 (2000).
連結：
6. A. Kirianov, T. Hagiwara, H. Kishi, and H. Ohsato, “Effect of Ho/Mg ratio on formation of core-shell structure in BaTiO3 and on dielectric properties of BaTiO3 ceramics,” Jpn. J. Appl. Phys., 41 [11B] 6934-6937 (2002).
連結：

Times Cited (19) 〈TOP〉

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