Struvite Grown in Gel, Its Crystal Structure at 90 K and Thermoanalytical Study

Crystals

Agnieszka Czylkowska¹  Lesław Sieroń¹  Jolanta Prywer² 

[1] Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Łódź, Poland;Institute of Physics, Lodz University of Technology, Wólczańska 219, 90-924 Łódź, Poland;

关键词: crystal growth;    crystallization;    morphology;    crystal structure;    phosphates;    thermal decomposition;    magnesium compounds;    struvite structure;    struvite;    growth from gel;    magnesium ammonium phosphates hexahydrate;   

DOI  :  10.3390/cryst9020089

来源: DOAJ

【 摘 要 】

In this article, we report the crystallization of struvite in sodium metasilicate gel by single diffusion gel growth technique. The obtained crystals have a very rich morphology displaying 18 faces. In this study, the habit and morphology of the obtained struvite crystals are analyzed. The crystals were examined and identified as pure struvite by single X-ray diffraction (XRD). The orthorhombic polar noncentrosymmetric space group Pmn2₁ was identified. The structure of the crystal was determined at a temperature of 90 K. Our research indicates a lack of polymorphism, resulting from the temperature lowering to 90 K, which has not been previously reported. The determined unit cell parameters are as follows a = 6.9650(2) Å, b = 6.1165(2) Å, c = 11.2056(3) Å. The structure of struvite is presented here with a residual factor R1 = 1.2% at 0.80 Å resolution. We also present thermoanalytical study of struvite using thermal analysis techniques such as thermogravimetry (TG), derivative thermogravimetry (DTG) and differential thermal analysis (DTA).

【 授权许可】

Unknown