Hydrothermal Formation of Calcium Copper Tetrasilicate

E-ISSN： 1521-3765|21|49|17560-17564

ISSN： 0947-6539

Source： CHEMISTRY - A EUROPEAN JOURNAL, Vol.21, Iss.49, 2015-12, pp. : 17560-17564

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Abstract

AbstractWe describe the first hydrothermal synthesis of CaCuSi4O10 as micron‐scale clusters of thin platelets, distinct from morphologies generated under salt‐flux or solid‐state conditions. The hydrothermal reaction conditions are surprisingly specific: too cold, and instead of CaCuSi4O10, a porous calcium copper silicate forms; too hot, and calcium silicate (CaSiO3) forms. The precursors also strongly impact the course of the reaction, with the most common side product being sodium copper silicate (Na2CuSi4O10). Optimized conditions for hydrothermal CaCuSi4O10 formation from calcium chloride, copper(II) nitrate, sodium silicate, and ammonium hydroxide are 350 °C at 3000 psi for 72 h; at longer reaction times, competitive delamination and exfoliation causes crystal fragmentation. These results illustrate that CaCuSi4O10 is an even more unique material than previously appreciated.