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Microwave Dielectric Properties and Low-Temperature Sintering of Ba0.60Sr0.40TiO3 Ceramics

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In the present work, the sintering behaviors and dielectric properties of Ba0.60Sr0.40TiO3 (BST) ceramics with the addition of BaCu(B2O5) were investigated in detail. The results indicated that the addition reduced the sintering temperature of BST by about 500°C. It was suggested that a liquid phase BaCu(B2O5) assisted the densification of BST ceramics at lower temperatures. For a low-level BaCu(B2O5) addition (2.0 mol%), the BST sample sintered at 950°C for 5 h displayed good dielectric properties, with a moderate dielectric constant (=2553) and a low dielectric loss (tan =0.00305) at room temperature and at 10 kHz. The sample showed 45.9% tunability at 10 kHz under a dc electric field of 30 kV/cm. At the frequency of 0.984 GHz, BST-added 2.0 mol% BaCu(B2O5) possessed a dielectric constant of 2204 and a Q value of 146.7.
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Document Type: Research Article

Affiliations: Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

Publication date: October 1, 2009

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