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Standard enthalpy of formation of lithium diphosphate
Institution:1. Unité de recherche de physique des matériaux isolants et semi isolants, Faculté des Sciences de Sfax, Université du Sfax, Route de Soukra Km 3.5, BP 1171, 3000, Sfax, Tunisia;2. Laboratoire Physico-Chimique de L’Etat Solide, Université du Sfax, Faculté des Sciences de Sfax, Route de Soukra Km 3.5, BP 802, Sfax 3018, Tunisia;3. LUNAM Université, Université du Maine, CNRS UMR 6283, Institut des Molécules et Matériaux du Mans(IMMM), Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France;1. Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, A-1060, Vienna, Austria;2. X-ray Centre, TU Wien, Getreidemarkt 9, A-1060, Vienna, Austria;3. Naturhistorisches Museum Wien, Burgring 7, A-1010, Vienna, Austria;4. Institut für Mineralogie und Kristallographie, Universität Wien, Althanstraße 14, A-1090, Vienna, Austria;1. Université de Tunis El Manar, Faculté des Sciences, LR 01 SE 10, Laboratoire de Thermodynamique Appliquée, 2092 Tunis, Tunisia;2. Laboratoire de Thermodynamique et de Physico-Chimie du Milieu, Université Nangui Abrogoua, UFR SFA, 02 BP 801, Abidjan 02, Cote d''Ivoire;1. School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China;2. School of Pharmaceutical, Liaocheng University, Liaocheng 252059, China
Abstract:Lithium carbonate (Li2CO3) and ammonium dihydrogen phosphate (NH4H2PO4) were used for synthesizing lithium diphosphate (Li4P2O7). The purity of the latter compound was checked up by X-ray diffraction. The heat of dissolution of (Li4P2O7) in phosphoric acid solution was measured in a C-80 SETARAM calorimeter. Many dilution and mixing processes in acid solutions of several concentrations (w/w) H3PO4, were also realized in the calorimeter in order to get the standard enthalpy of formation of this product. Two thermochemical cycles were investigated and the obtained values for the enthalpy of formation are: (?3383.4 and ?3147) kJ · mol?1. The former one is in better agreement with literature data.
Keywords:Calorimetry  Thermochemistry  Enthalpy of formation  Enthalpy  Lithium diphosphate
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