碳酸鐳

碳酸鐳是一種無機化合物，化學式為RaCO₃，有強放射性。它可以形成正交晶系晶體，空間群Pmcn。^[2]

製備

碳酸鐳可以通過可溶性鐳鹽和碳酸銨反應得到：^[1]

Ra²⁺ + CO₃^2- → RaCO₃↓

硫酸鐳和1.5 M碳酸鈉在85 °C反應，也能得到碳酸鐳。^[3]

碳酸鐳可以和酸反應，生成其它鐳化合物：

RaCO₃ + 2 HNO₃ → Ra(NO₃)₂ + 2 H₂O

在室溫時，碳酸鐳在碳酸銨或氯化銨濃溶液中的溶解度比碳酸鋇大10倍，藉此可將鐳與鋇分離。^[4]它可用於製造鐳鈹中子源。^[5]

^ ^1.0 ^1.1 Richard C. Ropp. Encyclopedia of the Alkaline Earth Compounds. Elsevier, 2013. pp 370-371. Radium Carbonate
^ Weigel, F.; Trinkl, A. Crystal chemistry of radium. V. Radium salts of inorganic anions. Radiochimica Acta, 1973. 19 (4): 199-202. ISSN: 0033-8230.
^ Artem V. Matyskin, Burçak Ebin, Mikhail Tyumentsev, Stefan Allard, Gunnar Skarnemark, Henrik Ramebäck, Christian Ekberg. Disassembly of old radium sources and conversion of radium sulfate into radium carbonate for subsequent dissolution in acid. 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 （英語）.
^ 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.
^ Bedrich, Fridrich. Preparation of radium-beryllium neutron sources. Sb. Ref. Celostatni Radiochem. Konf., 3, Liblice, Czech., 1964. pp 135. CAN64: 90519.