☆ 4.5 Article

Enthalpy of formation of natural hydrous iron phosphate: Vivianite

JOURNAL OF CHEMICAL THERMODYNAMICS (2017)

Journal

JOURNAL OF CHEMICAL THERMODYNAMICS

Volume 110, Issue -, Pages 193-200

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

DOI: 10.1016/j.jct.2017.02.020

Keywords

Enthalpy of formation; Tian-Calvet microcalorimetry; Hydrous iron phosphate; Vivianite

Categories

Thermodynamics Chemistry, Physical

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Abstract

This paper presents the new data on thermodynamic properties of hydrous iron phosphate, vivianite. The thermochemical study of natural vivianite Fe2.322+Fe0.333+ Mg-0.35(PO4)(2)(OH)(0.33).7.67H(2)O (Kerch iron ore basin, Republic of Crimea, Russia) was carried out on a high-temperature heat-flux Tian-Calvet microcalorimeter Setaram (France). The mineral was characterized by X-ray microprobe analysis, powder and single crystal X-ray diffraction, thermal analysis, FFIR, Raman and Mossbauer spectroscopy. The value of Delta H-f(m)0(T= 298.15 K) for natural vivianite was found to be -(5217 +/- 11 kJ mol(-1)). The standard values of the entropy, enthalpy and Gibbs energy of formation at T= 298.15 K for vivianite of theoretical composition Fe-3(2+)(PO4)(2).8H(2)O were calculated as (571.0) J (K moI)(-1), -(5119 19) kJ mol(-1) and -(4439 +/- 19) kJ mol(-1) respectively. (C) 2017 Elsevier Ltd.

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Article Thermodynamics

Intermolecular interactions and thermochemical properties for aliphatic alcohols in 2-methyltetrahydrofuran: structure-property relations

Ruslan N. Nagrimanov, Aliya R. Ibragimova, Boris N. Solomonov

Summary: In this study, the heats of solution of hydrocarbons and alcohols with 2-methyltetrahydrofuran are systematically analyzed. Structure-property relationships are developed to calculate the enthalpy of solvation of aliphatic alcohols in 2-methyltetrahydrofuran. Specific interactions in the alcohol-2-methyltetrahydrofuran systems are determined to better understand intermolecular interactions in 2-methyltetrahydrofuran solutions. This research provides valuable insights into the properties and energies of these interactions, facilitating the transition to more environmentally friendly solvents.

JOURNAL OF CHEMICAL THERMODYNAMICS (2024)

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