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Title: Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298. 15 to 1400 K, and the reaction quartz + jadeite = analbite

Abstract

The heat capacities, C/sub p//sup 0/ of low albite, analbite, microcline, and high sanidine have been measured between 350 and 1000 K by differential scanning calorimetry. Evaluation of the results of several phase equilibrium studies of the reaction quartz + jadeite = analbite yields -3029.870 +/- 4.200 and -2851.300 +/- 4.200 kJ/mol for the enthalpy and Gibbs free energy of formation, respectively, of jadeite at 298.15 K and 1 bar. The enthalpy of the low albite-analbite transition determined from calorimetry using Amelia albite for low albite underestimates the magnitude of the enthalpy of the transition because Amelia albite is partially disordered (e.g., Holm and Kleppa, 1968).

Authors:
; ;
Research Org.:
Geological Survey, Reston, VA
OSTI Identifier:
5352130
Resource Type:
Journal Article
Journal Name:
Am. Mineral.; (United States)
Additional Journal Information:
Journal Volume: 66:11-12
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; FELDSPARS; PHASE STUDIES; SPECIFIC HEAT; THERMODYNAMICS; ALBITE; CALORIMETRY; EXPERIMENTAL DATA; HIGH TEMPERATURE; VERY HIGH TEMPERATURE; DATA; INFORMATION; MINERALS; NUMERICAL DATA; PHYSICAL PROPERTIES; SILICATE MINERALS; THERMODYNAMIC PROPERTIES; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989)

Citation Formats

Hemingway, B S, Krupka, K M, and Robie, R A. Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298. 15 to 1400 K, and the reaction quartz + jadeite = analbite. United States: N. p., Web.
Hemingway, B S, Krupka, K M, & Robie, R A. Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298. 15 to 1400 K, and the reaction quartz + jadeite = analbite. United States.
Hemingway, B S, Krupka, K M, and Robie, R A. . "Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298. 15 to 1400 K, and the reaction quartz + jadeite = analbite". United States.
@article{osti_5352130,
title = {Heat capacities of the alkali feldspars between 350 and 1000 K from differential scanning calorimetry, the thermodynamic functions of the alkali feldspars from 298. 15 to 1400 K, and the reaction quartz + jadeite = analbite},
author = {Hemingway, B S and Krupka, K M and Robie, R A},
abstractNote = {The heat capacities, C/sub p//sup 0/ of low albite, analbite, microcline, and high sanidine have been measured between 350 and 1000 K by differential scanning calorimetry. Evaluation of the results of several phase equilibrium studies of the reaction quartz + jadeite = analbite yields -3029.870 +/- 4.200 and -2851.300 +/- 4.200 kJ/mol for the enthalpy and Gibbs free energy of formation, respectively, of jadeite at 298.15 K and 1 bar. The enthalpy of the low albite-analbite transition determined from calorimetry using Amelia albite for low albite underestimates the magnitude of the enthalpy of the transition because Amelia albite is partially disordered (e.g., Holm and Kleppa, 1968).},
doi = {},
url = {https://www.osti.gov/biblio/5352130}, journal = {Am. Mineral.; (United States)},
number = ,
volume = 66:11-12,
place = {United States},
year = {},
month = {}
}