The influence of temperature (20–1000 °C) on binary mixtures of solid solutions of CH₃COOLi·2H₂O–MgHPO₄·3H₂O

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• 作者：Micha2 ; H. Umbreit ; Dominik Paukszta
• 关键词：CH₃COOLi&#xb7 ; 2H₂O ; MgHPO₄&#xb7 ; 3H₂O ; Binary mixtures ; TG ; DTA ; DTG ; IR ; WAXS
• 刊名：Physica B
• 出版年：2009
• 出版时间：1 November 2009
• 年：2009
• 卷：404
• 期：20
• 页码：3620-3636
• 全文大小：1886 K

文摘

Thermally induced phase transitions (20–1000 °C) in the substrates and binary mixtures of CH₃COOLi·2H₂O(1)–MgHPO₄·3H₂O(11) have been analysed. Changes taking place on dehydration and thermal dissociation of binary mixtures prepared with percent molar ratios of 90–10 % were studied by differential thermal analysis (TG, DTG, DTA), IR-spectroscopy and WAXS.

The above-mentioned substrates changed their structure when heated for 1 h at 500 or 1000 °C. CH₃COOLi·2H₂O(1) (ID: 23-1171) changed the structure at 500 °C to that of Li₂CO₃ (ID: 22-1141), while at 1000 °C the structure was impossible to analyse as the compound reacted both with porcelain and with platinum (crucible materials). MgHPO₄·3H₂O(11) (Newberyite, ID: 35-780, 19-762) changed its structure at 500 °C to amorphous phase and at 1000 °C to Mg₂P₂O₇ (ID: 32-626).

The following compounds were assayed in the respective binary mixtures heated at 500 °C for 1 h: 70 % (1)–30 % (11): LiMgPO₄ (ID: 18-735), MgO (ID: 4-829); 50 % (1)–50 % (11): LiMgPO₄ (ID: 18-735), Li₃PO₄ (ID: 25-1030); 30 % (1)–70 % (11): LiMgPO₄ (ID: 32-574); binary mixtures heated at 1000 °C contained the following compounds: 70 % (1)–30 % (11): LiMgPO₄ (ID: 32-574,18-735), Li₃PO₄ (ID: 15-760,25-1030), MgO (ID: 4-829); 50 % (1)–50 % (11): LiMgPO₄ (ID: 32-574, 18-735), MgO (ID: 4-829); 30 % (1)–70 % (11): LiMgPO₄ (ID: 18-735, 32-574), Mg₂P₂O₇ (ID: 22-1152, 8-38), Li₄SiO₄ (37-1472).