Estimating the thermodynamic properties of phosphate minerals at high and low temperature from the sum of constituent units
Open Access
- 28 October 2009
- journal article
- Published by Editorial CSIC in Estudios Geológicos
- Vol. 65 (2), 109-119
- https://doi.org/10.3989/egeol.39849.060
Abstract
11 pages, 6 tables, 2 figures.Using the polyhedral units model of Hazen and employing a method of least-squares, the contributionud of nineteen constituent units to the free energy and fifteen units to the enthalpy, at 298 K and 1 bar ofud pressure, have been calculated for mineral phosphates. The contribution of these constituent units to theud free energy at higher temperatures has also been calculated.ud [EN] From these data we can estimate the thermodynamic properties of phosphates by summing the contributionud of the distinct units, with more accuracy than the methods published up until now.[ES] Usando el modelo de unidades poliédricas de Hazen, y empleando un método de ajuste por mínimosud cuadrados, se ha calculado la contribución de diecinueve unidades constituyentes a la energía libre y deud otras quince unidades a la entalpía de los fosfatos minerales en condiciones termodinámicas normalesud (298 °K de temperatura y 1 bar de presión) y a altas temperaturas (400-1.000 °K).ud Con los valores de gi y hi calculados por este método se puede estimar las propiedades termodinámicasud de cualquier fosfato mineral con mayor precisión que la conseguida hasta ahora por otros métodos.This work was funded by project CGL-2005-C02-02 fromud the Spanish Ministerio de Educacion y Ciencia.Peer revieweKeywords
This publication has 1 reference indexed in Scilit:
- Electrogyration and Faraday rotation in pure and Cr-doped lead germanate crystalsJournal of Physics: Condensed Matter, 2008