摘要
全文共分成三部分：１．ＮＨ４ＨＦ２的升华提纯；２．ＺｒＦ４、ＨｆＦ４的升华提纯；３．ＡｌＦ３的升华提纯（包括在ＢａＦ２、ＬａＦ３等中的用升华法除去过渡金属氟化物杂质的提纯）．１．ＮＨ４ＨＦ２的升华提纯用热力学计算的方法，计算了有关ＮＨ４ＨＦ２的制备、在水溶液中的离解、固态热分解等的平衡常数Ｋ和克分子转化率α；为ＮＨ４ＨＦ２的制备和使用，更主要的是为除水、为升华温度的选择、为整个升华工艺的建立，提供了可靠的依据．得到的升华产品，经用ＸＲＤ鉴定，为ＪＣＰＤＳ１２－３０２ＮＨ４ＨＦ２的正交晶体，不含其它成分；Ｆｅ含量＜０．５ｐｐｍ．
The whole article is composed of three portions:1. Sublimating purification of NH4HF2;2. Sublimating purification of ZrF4 and HfF4;3. Sublimating purification of AlF3 (included purification of BaF2 and LaF3 ect. by sublimating out impurities of transition metal fluorides).1. Sublimating purification of NH4HF2 This article, in the way of thermodynamic calculating, has computed equilibrium constant K and molar transition rate al for the preparation of NH4HF2, for dissociation of NH4HF2 in aqueous solution and for heating decompostion of NH4HF2. The result provides sound basis for the preparation and use of NH4HF2, as well as more mainly for removing water, for choosing sublimate temperature and for establishing the whole sublimation technological process of NH4HF2.Sublimated product is examined by XRD to be JCPDS 12-302 rhombic system NH4HF2 crystal.The content of Fe is less than 0.5ppm.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第3期343-350,共8页
Journal of Inorganic Materials
关键词
酸合
氟化铵
氟化物
升华
提纯
ammonium acidfluoride, fluorides sublimation, equilibrium constant
