加速器质谱用NH_4HfF_5的分离条件及热稳定性研究  

Study on the separation conditions optimization and thermostability in NH_4HfF_5 for accelerator mass spectrometry

作　　者：姜涛[1] 杨君[1] 杨通在[1] 何玉晖[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《化学研究与应用》2013年第1期69-72,共4页Chemical Research and Application

基　　金：国家自然科学基金项目(11075142)资助

摘　　要：研究了不同淋洗液浓度对加速器质谱测量用NH4HfF5制样过程中阳离子交换产额的影响,用重量法对阳离子交换产额进行了测量。研究了多相法合成的NH4HfF5样品热稳定性,用XRD表征了不同温度处理下样品物相的变化情况。研究了三种(液相、固相和多相)合成方法对样品中180HfF5-离子束流和19F-/16O-比值的影响,用离子源进行了测量。结果表明:在阳离子交换过程选择60mL 1mol/L HCl为淋洗液时,阳离子交换产额可达97%。多相法合成的NH4HfF5样品在573K热处理1h后物相转变为NH4Hf2F9,在773 K、973 K、1173 K和1373 K热处理1h后物相则转变为HfO2,说明在热处理温度高于573 K后NH4HfF5热稳定较差。多相法合成的NH4HfF5样品中19F-/16O-比值能达到35,180HfF5-离子束流能达到560 nA,优于液相和固相法合成的样品。The relationship between elution solution concentrations and yields of cation exchange separation process was studied. The yields of cation exchange were measured by weight approach. The NH4 HfF5 samples synthesized by multiphase method were charac- terized by XRD after being heated in different temperatures. The samples（ containing Hf and F）were measured by ion resource in order to study the effect on the19F-/16O- ratio and the beam flux of 180HfFs- in three types samples（ synthesized by liquid-phase, solid-phase and multiphase method）. The results showed that the best yield of cation exchange was 97% ,when 60 mL lmol/L HC1 solution was chosen as eluent. When the NH4 HfF5 sample synthesized by multiphase method was heated at 573 K for 1 h, it trans- formed to NH4Hf2F9. After being heated at 773 K,973 K, 1173 K and 1373 K for 1 h, respectively, they all transformed to HfO2. When heating temperature was above 573 K, the thermostability of NH4 HfF5 sample was poor. In NH4 HfF5 sample synthesized by multiphase method,the 19F-/160- ratio was 35 and the beam flux of 180HfF5- was 560 nA,which were both better than those in the samples synthesized by liquid-phase synthesis or solid-phase method.

关 键 词：加速器质谱 NH4HfF5 分离 热稳定性 束流 

分 类 号：O614.413[理学—无机化学]