https://hal-insu.archives-ouvertes.fr/insu-01442544Bottinga, YanYanBottingaIPGP - Institut de Physique du Globe de Paris - UPMC - Université Pierre et Marie Curie - Paris 6 - INSU - CNRS - Institut national des sciences de l'Univers - IPG PARIS - UPD7 - Université Paris Diderot - Paris 7 - UR - Université de La Réunion - CNRS - Centre National de la Recherche ScientifiqueWeil, D.D.WeilUniversity of Oregon, Eugene 97403 Paris France - University of Oregon [Eugene]Richet, PascalPascalRichetIPGP - Institut de Physique du Globe de Paris - UPMC - Université Pierre et Marie Curie - Paris 6 - INSU - CNRS - Institut national des sciences de l'Univers - IPG PARIS - UPD7 - Université Paris Diderot - Paris 7 - UR - Université de La Réunion - CNRS - Centre National de la Recherche ScientifiqueDensity calculations for silicate liquids. I revised method for aluminosilicate compositionsHAL CCSD1982[SDU] Sciences of the Universe [physics]Fareau, Eva2017-01-20 16:47:452021-11-16 04:46:122017-01-20 16:47:45enJournal articles10.1016/0016-7037(82)90047-31Equations are developed for calculating the density of aluminosilicate liquids as a function of composition and temperature. The mean molar volume at reference temperature Tr, is given by , where the summation is taken over all oxide components except A12O3, X stands for mole fraction, terms are constants derived independently from an analysis of volume-composition relations in alumina-free silicate liquids, and is the composition-dependent apparent partial molar volume of Al2O3. The thermal expansion coefficient of aluminosilicate liquids is given by , where terms are constants independent of temperature and composition, and is a composition-dependent term representing the effect of Al2O3 on the thermal expansion. Parameters necessary to calculate the volume of silicate liquids at any temperature T according to V(T) = Vrexp[α(T-Tr)], where Tr = 1400°C have been evaluated by least-square analysis of selected density measurements in aluminosilicate melts. Mean molar volumes of aluminosilicate liquids calculated according to the model equation conform to experimentally measured volumes with a root mean square difference of 0.28 and an average absolute difference of 0.90% for 248 experimental observations. The compositional dependence of is discussed in terms of several possible interpretations of the structural role of Al3+ in aluminosilicate melts.