Abstract — A physicochemical study of natural hydrous magnesium orthophosphates bobierrite Mg 3 [PO 4 ] 2 · 8H 2 O and kovdorskite Mg 2 [PO 4 ](OH) · 3H 2 O from the Kovdor carbonatite massif, Kola Peninsula, Russia, was carried out using X-ray diffraction, infrared spectroscopy, Raman spectroscopy, and thermal analysis. The enthalpies of dehydration of the minerals were measured using a NETZSCH DSC 204 F1 differential scanning calorimeter, the enthalpies of formation from the elements for bobierrite (–6167 ± 16 kJ/mol) and kovdorskite (–3251 ± 10 kJ/mol) were determined by high-temperature melt solution calorimetry on a Setaram high-temperature heat-flux Tian–Calvet microcalorimeter. The values of their standard entropies and Gibbs energies of formation are estimated.

中文翻译：

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天然水合正磷酸盐镁水硼钙石和 Kovdorskite：FTIR、拉曼、热和热化学研究

摘要——对俄罗斯科拉半岛科夫多尔碳酸盐岩地块中天然水合正磷酸镁镁 3 [PO 4 ] 2 · 8H 2 O 和柯夫多锰矿 Mg 2 [PO 4 ](OH) · 3H 2 O 进行了理化研究使用 X 射线衍射、红外光谱、拉曼光谱和热分析。矿物的脱水焓使用 NETZSCH DSC 204 F1 差示扫描量热仪测量，测定了钙铁矿 (–6167 ± 16 kJ/mol) 和 kovdorskite (–3251 ± 10 kJ/mol) 元素的形成焓通过 Setaram 高温热通量 Tian-Calvet 微量热仪上的高温熔体溶液量热法。估计它们的标准熵和吉布斯形成能的值。