碳酸镭

碳酸镭是一种无机化合物,化学式为RaCO3,有强放射性。它可以形成正交晶系晶体,空间群Pmcn[2]

碳酸镭
英文名
识别
CAS号 7116-98-5  checkY
性质
化学式 RaCO3
286.011 g·mol¹
溶解性 2.1×10−4g(20 °C)[1]
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

制备

碳酸镭可以通过可溶性镭盐和碳酸铵反应得到:[1]

Ra2+ + CO32- → RaCO3

硫酸镭和1.5 M碳酸钠在85 °C反应,也能得到碳酸镭。[3]

性质及用途

碳酸镭可以和酸反应,生成其它镭化合物:

RaCO3 + 2 HNO3 → Ra(NO3)2 + 2 H2O

在室温时,碳酸镭在碳酸铵氯化铵浓溶液中的溶解度比碳酸钡大10倍,借此可将镭与钡分离。[4]它可用于制造镭铍中子源。[5]

参考文献

  1. Richard C. Ropp. Encyclopedia of the Alkaline Earth Compounds. Elsevier, 2013. pp 370-371. Radium Carbonate
  2. Weigel, F.; Trinkl, A. Crystal chemistry of radium. V. Radium salts of inorganic anions. Radiochimica Acta, 1973. 19 (4): 199-202. ISSN: 0033-8230.
  3. Artem V. Matyskin, Burçak Ebin, Mikhail Tyumentsev, Stefan Allard, Gunnar Skarnemark, Henrik Ramebäck, Christian Ekberg. . Journal of Radioanalytical and Nuclear Chemistry. 2016-11, 310 (2): 589–595 [2020-12-10]. ISSN 0236-5731. doi:10.1007/s10967-016-4927-x (英语).
  4. Nikitin, B. A. Studies on the analytical chemistry of radium. II. Reactions of pure radium. Trav. inst. elat radium (U. S. S. R.), 1937. 3. pp 228-237. CAN31: 32676.
  5. Bedrich, Fridrich. Preparation of radium-beryllium neutron sources. Sb. Ref. Celostatni Radiochem. Konf., 3, Liblice, Czech., 1964. pp 135. CAN64: 90519.
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