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Processing and Study on B2O3–Nb2O5–SrO-BaO Glass Ceramics

Author: ZuoXiaoYe
Tutor: ZengYiKe
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Glass ceramic Energy storage materials BaF2 addition crystallization kinetics
CLC: TQ174.6
Type: Master's thesis
Year: 2010
Downloads: 45
Quote: 0
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Abstract


Due to good performance of ferroelectric glass ceramics which own both advantages of glass and ferroelectrics, glass ceramic materials are attracting more and more material scientist’s attention. Specially, as the high energy density capacitance, the ferroelectric glass ceramics own huge application value. In ferroelectric glass ceramics, since glass ceramic with high permittivity and high breakdown voltage can meet requirement of power electronics and pulsed power application, a large number of investigations have been started all over the world. In this degree thesis, a series of B2O3– Nb2O5– SrO– BaO glass ceramics were prepared and studied.Transparent 58B2O3- 10Nb2O5- 10Li2O and 58B2O3– 10Nb2O5– 10SrO– 10BaO glass matrixes were prepared by conventional melting. The effect of heating mechanism was both studied in these two glass ceramics. The result proved that high heating temperature and long heating time were helpful to improve these glass ceramics’crystallization and dielectric performance. The 58B2O3- 10Nb2O5- 10Li2O glass ceramics heated at 650℃for 4 h gained a relative dielectric constant of 25 and a breakdown strength of 18.5KV/mm. The 58B2O3– 10Nb2O5– 10SrO– 10BaO glass ceramic heated at 800℃for 4h gained a relative dielectric of 65 and a breakdown strength of 20.1KV/mm. In addition, in order to a33- 10Nb2O5- 10Li2O abided by bulk crystallization and 58B2O3– 10Nb2O5– 10SrO– 10BaO glass ceramic was surface crystallization.58B2O3- 10Nb2O5- 10Li2O abided by bulk crystallization and 58B2O3– 10Nb2O5– 10SrO– 10BaO glass ceramic was surface crystallization.58B2O3– 10Nb2O5– 10SrO– 10BaO glass ceramics with addition of BST, PLZST, and BaF2 were prepared. The result showed that BaF2 could improve the glass ceramics’dielectric constant. And the dielectric breakdown performance was not affected. Then the contents of Nb2O5, SrO and BaO were modified in glass ceramics with BaF2 and the change of these contents was obvious. 58B2O3– 11Nb2O5– 11SrO– 11BaO- 3BaF2 glass ceramic’s relative dielectric constant was the highest:εr=116, tanθ=0.011, Ev=25KV/mm, We =0.32J/cm3。.A series of strontium barium niobate-based B2O3 system glass ceramics have been prepared by conventional melting and heat-treated crystallization method. The effect of BaF2 addition innucleation and crystallization kinetics has been explored for dielectric applications. BaF2 addition decreased the activation energy of crystallization obviously and changed microstructure of glass–ceramics significantly. The dielectric constant and breakdown strength of glass–ceramics were improved significantly by adding BaF2. The glass–ceramic with a relative dielectric constant of 337, a breakdown strength of 52.7 kV/mm and an energy density of 4.14J/cm3 was achieved.

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