Characterization of a new efflorescence salt on calcareous historic objects stored in wood cabinets: Ca2(CH3COO)(HCOO)(NO3)2·4H2O
Characterization of a new efflorescence salt on calcareous historic objects stored in wood cabinets: Ca2(CH3COO)(HCOO)(NO3)2·4H2O
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DOI：
10.1016/j.corsci.2017.12.020
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发表时间：
2017-12
影响因子：
8.3
通讯作者：
S. Bette;G. Eggert;Andrea Fischer;J. Stelzner;R. Dinnebier
中科院分区：
文献类型：
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作者：
S. Bette;G. Eggert;Andrea Fischer;J. Stelzner;R. Dinnebier
研究了生长在青铜碗、古典陶瓷和古代酒壶表面的白色风化晶体。X-射线粉末衍射(XRPD)表明，在每种情况下都形成了一个相同的、迄今未知的相。通过高分辨XRPD测量确定了其晶体结构，发现其物相组成为Ca_2(CH_3COO)(HCOO)(NO_3)_2·4H_2O，这与补充分析相一致。Ca~(2+)(CH_3COO)(HCOO)(NO_3)(NO_3)_2·4H_2O是一维的醋酸钙和甲酸钙交替排列的锯齿状链，它与天然或人工生成的风化盐如方解石或方解石密切相关。
White efflorescence crystals grown on the surfaces of a bronze bowl, classical ceramic and ancient wine jugs were investigated. X-ray powder diffraction (XRPD) revealed that in each case an identical, hitherto unknown phase was formed. The crystal structure was solved from high resolution XRPD measurements and revealed a phase composition of Ca2(CH3COO)(HCOO)(NO3)2·4H2O, which is in accordance with the complementary analysis. The overall structural motif of Ca2(CH3COO)(HCOO)(NO3)2·4H2O, one dimensional calcium carboxylate zig zag chains in which acetate and formate ions are arranged in an alternating fashion, is closely related to other naturally occurring or artificial efflorescence salts like thecotrichite or calclacite.