Thermodynamic characteristics of natural iron-lithium micas
- 1. Moskovskij Gosudarstvennyj Univ. im. M.V. Lomonosova, Geologicheskij Fakul'tet, Moscow (Russian Federation)
- 2. Vserossijskij Inst. Mineral'nogo Syr'ya im. N.M. Fedorovskogo, Moscow (Russian Federation)
Description
A thermochemical study of natural lithium micas, iron-containing polylithionite and lepidolite, was performed on a high-temperature heat-flux Calvet microcalorimeter (Setaram, France). Melt solution calorimetry was used to measure the enthalpies of mineral formation from the elements Δf H0el(298.15 K), -5989.3 ± 9.6 and -5981.3 ± 6.3 kJ/mol, respectively. The drop method was used to determine the enthalpy increments heating of the micas over the temperature interval 444-973 K. The equations for the temperature dependences of the heat capacities and enthalpies of Fe-polylithionite and Fe-lepidolite were obtained. The S0(298.15 K) and Δf G0el(298.15 K) values were estimated. The thermodynamic functions of the micas were calculated over the temperature range 298.15-1000 K
Abstract (Russian)
На высокотемпературном теплопроводящем микрокалориметре Кальве проведено термохимическое изучение природных литиевых слюд - железистых полилитионита и лепидолита. Методом расплавной калориметрии растворения экспериментально определены их энтальпии образования из элементов ΔfH0el(298.15 K): -5989.3 ± 9.6 и -5981.3 ± 6.3 кДж/моль соответственно. Методом сброса получены экспериментальные данные по приращениям энтальпии этих слюд в интервале 444-973 K и рассчитаны уравнения температурных зависимостей теплоемкости и теплосодержаний для Fe-полилитионита и Fe-лепидолита. Оценены значения S0(298.15 K) и рассчитаны величины ΔfG0el(298.15 K) и термодинамических функций изученных слюд в интервале 298.15-1000 KAdditional details
Additional titles
- Original title (Russian)
- Термодинамические характеристики природных железисто-литиевых слюд
Publishing Information
- Journal Title
- Zhurnal Fizicheskoj Khimii
- Journal Volume
- 82
- Journal Issue
- 6
- Journal Page Range
- p. 1074-1077
- ISSN
- 0044-4537
- CODEN
- ZFKHA9
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 39122399
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- CALORIMETRY; ENTROPY; EXPERIMENTAL DATA; FORMATION FREE ENTHALPY; FORMATION HEAT; IRON OXIDES; LITHIUM OXIDES; MICA; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K
- Descriptors DEC
- ALKALI METAL COMPOUNDS; CHALCOGENIDES; DATA; ENERGY; ENTHALPY; FREE ENTHALPY; INFORMATION; IRON COMPOUNDS; LITHIUM COMPOUNDS; MINERALS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REACTION HEAT; SILICATE MINERALS; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- 19 refs., 6 tabs.