摘要
采用草酸盐共沉淀法,以氯化钙、氯化锶、氧氯化锆和草酸为原料成功地制备了Ca1-xSrxZrO3系列陶瓷固溶体.利用TGDTA和XRD等手段分析了Ca1-xSrxZrO3前驱体的热分解过程并确定了形成结晶相的温度.结果表明:在1000℃以上煅烧前驱体可获得立方相的Ca1-xSrxZrO3完全固溶体,晶体的晶格常数变化规律符合Vegard定律;将经过1100℃煅烧的Ca0.8Sr0.2ZrO3粉体干压成型并在1450℃烧结后,所得瓷体的相对密度和平均晶粒尺寸分别达到93.0%和0.7μm;当Sr2+在固溶体中的比例(x)为0.2时,Ca1-xSrxZrO3陶瓷在10MHz高频下室温介电常数达到最大27.6.
Ca1-xSrxZrO3（CSZ） powders were synthesized successfully by the oxalate coprecipitation process. In this study, oxalate acid and a mixture solution of CaC12, SrC12 and ZrOC12 were used as reactants and the product was a precursor of CSZ. TG-DTA curves were employed to characterize the thermal decomposition behavior of the precursor and gave an initial temperature of formation of CSZ crystal. The XRD results revealed also that when heating temperature was up to 1000℃, the powder crystallized was a full solid solution with cubic structure and the relationship of lattice parameter （a） and x agreed with the Vergard＇s law. The CSZ powder calcined at 1100℃ was sintered at 1450℃. The SEM micrograph of the sintered ceramics showed that the average grain size was around 0.7μm, and the relative density of the ceramics was 93.0%. The dielectric constant of the Ca0.8Sr0.2ZrO3 with Sr^2＋ in solid solution （x） of 0.2 measured at room temperature and under the high frequency of 10 MHz was 27.6.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第7期1704-1708,共5页
CIESC Journal
基金
国家高技术研究发展计划项目(2003AA32G030
2003AA302760).~~
