The invention relates to a new set of composite ceramic oxides and a preparation method thereof. This group of novel ceramic composite oxides with Mg: 2 MM O: \6X ': the M formula for the rare earth metal ions, yttrium or lanthanum, Sn, Sb, M' Zr, Hf, Ta and Nb, 0.5 < x < 0.5, the oxide with pyrochlore structure is not perfect. The minor composition changes of any metal ion up to 8% are permissible for the formation of desired phase states. Methods of preparing such novel compounds as: (a) according to the formula is formed: 2 compounds Mg MM 'O: 6 + X the molar ratio of Mg: M: M' = 2: 1: 1 mg, M and M 'hybrid compounds (wherein M is y La, or any rare earth elements; M' for antimony, tin, zirconium and tantalum). The minor composition changes of any metal ion up to 8% are permissible for the formation of desired phase states. (b) in step (I) compounds in use can be selected from their oxides, carbonates, chlorides, alkyl oxide, nitrate, sulfate, and the salt is preferably selected from oxides or carbonates. (c) the mixture obtained in step (I) can be mixed by ball milling or by wetting medium. The wetting medium may be water, alcohol, ketones, or any other organic solvent. The milling slurry drying the obtained powder to remove liquid, (d) the mixture in the temperature range of 1000 ~ 1600 DEG C within 3 to 50 hours according to the heating needs of different heating time, heating can be completed in one step, or in a few hours after the heating reaction removed from the inspection phase and form. If necessary, grinding again after heating. Intermediate grinding can be as much as 5 times as high as possible.
【技术实现步骤摘要】
,稀土金属;m'=sn,sb,zr,hf和ta)化合物及其制备方法
本专利技术涉及新的一组复合陶瓷氧化物及其制备方法。本专利技术特别涉及通式为Mg2MM’O6+X的新复合陶瓷氧化物以及制备该复合陶瓷氧化物的固态反应方法,其中M为稀土金属离子或Y,M’为Sn、Sb、Zr、Hf、Ta和Nb,该复合陶瓷氧化物具有不完善的烧绿石结构。本专利技术中的复合陶瓷粉末可用于有源和无源的电子器件;可用于对温度稳定、低损耗、高电容率的绝缘器件(dielectric application);可用于对温度稳定和温度补偿性的电介质、微波电介质和作为共发射的微波组件(co-fired component);可用于燃料电池的电极;可作为催化剂(固体光催化剂、氧化催化剂);可作为气体监测传感器;可作为放射性垃圾的可能主体(host)和荧光中心的主体。近年来,对制备及表征通式为A2MM’O6+X的复合陶瓷氧化物的关注在日益增加,其中A=Ba、Sr和Ca,M=Y和稀土族,M’=Sb、Sn、Nb、Zr、Hf和Ta。通式为Ba2MM’O6+X的化合物的以钙钛矿结构结晶。一些化学式为Sr2MM’O6+X的化合物也有报道。它们也具有钙钛矿结构。在这些体系中已有报道的一些化合物包括Sr2GaNbO6、Sr2GaTaO6、Sr2AlNbO6、Sr2AlTaO6、Ca2GaNbO6、Ca2GaTaO6、Ca2AlNbO6、Ca2AlTaO6、Ba2DySnO5.5、Ba2EuNbO6、Ba2ErSbO6、YBa2DySbO6、Ba2PrHfO5.5(J Koshy,K S Kumar,J Kuria ...
【技术保护点】
通式为Mg↓[2]MM’O↓[6+X]的新颖化合物,其中,M为Y、La或稀土金属,M’为Sn、Sb、Zr和Ta,0.5<x<0.5,该化合物具有烧绿石结构,任意金属离子高达8%的微小组成变化对于形成所需相态是容许的。
【技术特征摘要】
【专利技术属性】
技术研发人员:J雅梅斯,S桑迪库玛,KVPO娜拉,
申请(专利权)人:科学与工业研究委员会,
类型:发明
国别省市:IN[印度]
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。