【摘要】 采用溶胶-凝胶法制备Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷粉末,以传统陶瓷制备工艺制备Mg元素掺杂的Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷.研究MgO掺杂量为1.6%(质量分数)时,MgO固相掺杂和Mg2+湿化学法掺杂两种不同的掺杂方式对Mg掺杂的Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷显微结构及电学性能的影响.研究结果表明,当Mg掺杂量相同时,掺杂方式对Mg掺杂的Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷的显微结构和电学特性有显著的影响,相比纯的Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷,两种掺杂方式中,Mg2+湿化学法掺杂相对于MgO固相掺杂,在BSZT陶瓷中的分布更均匀,替位程度更高,所以其对介电常数的影响也相对更大.而MgO固相掺杂相对于Mg2+湿化学法掺杂明显地促进了陶瓷晶粒的生长,提高了陶瓷的致密性,同时其击穿电场和电阻率也有较大提高.1 350℃下烧结的固相MgO掺杂的Ba0.3Sr0.7Zr0.18Ti0.82O3陶瓷性能较优,介电常数约为590,介电损耗低于0.000 5,电阻率为7.78×1013Ω.mm,击穿场强为6.56kV/mm.更多还原

【Abstract】 Ba0.3Sr0.7Zr0.18Ti0.82O3(BSZT) powder was synthesized by sol-gel processing and Mg:Ba0.3Sr0.7Zr0.18Ti0.82O3 ceramics with 1.6%(wt.) MgO doped were prepared by ceramic fabrication traditional technology.The effects of doping method on the characteristics of the microstructure and electric properties of Mg:Ba0.3Sr0.7Zr0.18Ti0.82O3 ceramics were investigated experimentally.The Mg element was introduced into the powder by mixing with solid state MgO and by sol-gel processing with Mg2+,respectively.The results revealed that doping method played an important role in the microstructure and electric properties of Mg:Ba0.3Sr0.7Zr0.18Ti0.82O3 ceramics.Compared with pure Ba0.3Sr0.7Zr0.18Ti0.82O3 ceramics,Mg2+ aid distributed more evenly and substituted highlier in the BSZT ceramics than MgO aid,so it had a great impact on the dielectric constant of ceramics.Moreover,compared to Mg2+ aid,MgO aid was beneficial to improve the density of the ceramics and the resistivity and breakdown strength were also enhanced.The Mg:Ba0.3Sr0.7Zr0.18Ti0.82O3 ceramics doped MgO,sintered at 1 350 ℃,possessed the best electric properties:ε≈590 at 110 MHz,tanδ≈0.000 5,ρ≈7.78×1013 Ω·mm,E≈6.56 kV/mm.更多还原