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Titolo:
High-temperature X-ray investigation of sanidine-analbite crystalline solutions: Thermal expansion, phase transitions, and volumes of mixing
Autore:
Hovis, GL; Brennan, S; Keohane, M; Crelling, J;
Indirizzi:
Lafayette Coll, Dept Geol & Environm Geosci, Easton, PA 18042 USA Lafayette Coll Easton PA USA 18042 Environm Geosci, Easton, PA 18042 USA Hopkins High Sch, Dept Sci, New Haven, CT 06515 USA Hopkins High Sch New Haven CT USA 06515 Dept Sci, New Haven, CT 06515 USA Penn State Univ, Dept Geosci, University Pk, PA 16802 USA Penn State UnivUniversity Pk PA USA 16802 i, University Pk, PA 16802 USA Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 n, University Pk, PA 16802 USA
Titolo Testata:
CANADIAN MINERALOGIST
, volume: 37, anno: 1999,
parte:, 3
pagine: 701 - 709
SICI:
0008-4476(199906)37:<701:HXIOSC>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLUTION THERMODYNAMIC MODELS; POSITION-SENSITIVE DETECTOR; AL-SI DISTRIBUTION; ALKALI FELDSPARS; ANGULAR RELATIONS; HIGH ALBITE; ENTHALPIES; MONALBITE; SERIES;
Keywords:
volumes of mixing; phase transitions; temperature; alkali feldspars; sanidine; analbite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Hovis, GL Lafayette Coll, Dept Geol & Environm Geosci, Easton, PA 18042 USA Lafayette Coll Easton PA USA 18042 Geosci, Easton, PA 18042 USA
Citazione:
G.L. Hovis et al., "High-temperature X-ray investigation of sanidine-analbite crystalline solutions: Thermal expansion, phase transitions, and volumes of mixing", CAN MINERAL, 37, 1999, pp. 701-709

Abstract

Unit-cell parameters and volumes have been measured for an eleven-member sanidine - analbite series from room temperature to 950 degrees C. Slopes dV/dT and. in turn, coefficients of thermal expansion, vary systematically with composition, as sodic members expand to a greater degree than potassic ones, Volumes of K-Na mixing (V-ex) reach maximum values in the sodic parr of the compositional range at all temperatures, but decrease in magnitude byabout 20% from room to elevated temperature, as the distribution of V-ex values also becomes increasingly symmetrical with respect to composition Transformation from triclinic to monoclinic symmetry occurs above room temperature for the five most sodic samples. Transformation temperature is relatedlinearly to the mole fraction of potassium in the feldspar.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 22:07:54