Carlson Elmer T, Berman Horace A
J Res Natl Bur Stand A Phys Chem. 1960 Jul-Aug;64A(4):333-341. doi: 10.6028/jres.064A.032. Epub 1960 Aug 1.
Two calcium aluminate carbonate hydrates, previously reported in the literature, were prepared and various properties determined. The compound 3CaO·AlO·CaCO·11HO, was prepared by precipitation from mixtures of solutions of calcium aluminate, calcium hydroxide and sodium carbonate; and, in less pure form, by several other means. It forms thin hexagonal plates having refractive indices 1.532 and 1.554. From X-ray diffraction, cell parameters, calculated on the assumption of hexagonal symmetry, are =8.716, =7.565. On continued exposure to atmospheric carbon dioxide it is decomposed to calcium carbonate and hydrated alumina. The compound 3CaO·AlO·3CaCO·32HO, was prepared by precipitation from mixtures of ammonium bicarbonate, calcium aluminate, and calcium hydroxide in aqueous sucrose solution. It crystallized as spherulites of minute needles. Other methods produced individual crystals, some tubular, but only in minute quantities or mixed with other phases. X-ray diffraction indicates isomorphism with 3CaO·AlO·3CaSO·32HO. 3CaO·AlO·3CaCO·32HO is, in general, less stable than the monocarbonate complex. The needle-form "silicoaluminate" reported by Flint and Wells was re-examined. It was concluded that the phase probably contains CO as well as SiO, but the exact composition is in doubt.
制备了文献中先前报道的两种碳酸钙铝水合物，并测定了各种性质。化合物3CaO·Al₂O₃·CaCO₃·11H₂O是通过从铝酸钙、氢氧化钙和碳酸钠溶液的混合物中沉淀制备的；并且通过其他几种方法制备的纯度较低。它形成具有折射率1.532和1.554的薄六边形板。根据X射线衍射，假设为六方对称计算的晶胞参数为a = 8.716，c = 7.565。持续暴露于大气二氧化碳中，它会分解为碳酸钙和水合氧化铝。化合物3CaO·Al₂O₃·3CaCO₃·32H₂O是通过在蔗糖水溶液中从碳酸氢铵、铝酸钙和氢氧化钙的混合物中沉淀制备的。它结晶为微小针状的球晶。其他方法产生单晶，一些是管状的，但数量很少或与其他相混合。X射线衍射表明与3CaO·Al₂O₃·3CaSO₄·32H₂O同构。一般来说，3CaO·Al₂O₃·3CaCO₃·32H₂O比单碳酸盐配合物稳定性差。对弗林特和韦尔斯报道的针状“硅铝酸盐”进行了重新研究。得出的结论是，该相可能同时含有CO₂和SiO₂，但确切组成仍不确定。
