Rare earth hydroxide and method for the preparation thereof
    10.
    发明授权
    Rare earth hydroxide and method for the preparation thereof 有权
    稀土氢氧化物及其制备方法

    公开(公告)号:US06733882B2

    公开(公告)日:2004-05-11

    申请号:US09923441

    申请日:2001-08-08

    IPC分类号: B32B516

    摘要: The invention discloses a method for the preparation of a rare earth hydroxide powder in which, different from the conventional wet-process hydroxide precipitation method in an aqueous solution of a rare earth salt by the addition of an alkali, a powder of a rare earth oxide is brought into contact with a limited amount of water in the form of either liquid or vapor and kept in contact with water at a temperature of 30 to 200° C. The thus prepared rare earth hydroxide powder is characterized by a small crystallite diameter not exceeding 40 nm and outstandingly low contents of impurity chlorine and nitrate ions originating in the starting rare earth salt in the hydroxide prepared by the conventional wet-process method. The inventive rare earth hydroxide powder is advantageous as a component ingredient or as an adjuvant in the ceramic compositions for the preparation of a sintered dielectric ceramic bodies in respects of the greater dielectric constant and smaller temperature dependency of the dielectric constant than similar ceramic bodies prepared from a conventional rare earth hydroxide or oxide.

    摘要翻译: 本发明公开了一种制备稀土氢氧化物粉末的方法,其中不同于常规湿法氢氧化物沉淀法,在稀土盐水溶液中加入碱,稀土氧化物粉末 与液体或蒸气形式的有限量的水接触,并在30至200℃的温度下与水接触。由此制备的稀土氢氧化物粉末的特征在于微晶直径不超过 40nm,并且通过常规湿法制备的氢氧化物中源自起始稀土盐的杂质氯和硝酸根离子的含量显着低。 本发明的稀土氢氧化物粉末作为陶瓷组合物中的组分成分或佐剂是有利的,所述陶瓷组合物用于制备烧结介电陶瓷体的介电常数和介电常数的较小的温度依赖性比由 常规稀土氢氧化物或氧化物。