Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry
Autore:
Tangeman, JA; Phillips, BL; Navrotsky, A; Weber, JKR; Hixson, AD; Key, TS;
Indirizzi:
Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA Univ CalifDavis Davis CA USA 95616 m Engn & Mat Sci, Davis, CA 95616 USA Containerless Res Inc, Evanston, IL 60201 USA Containerless Res Inc Evanston IL USA 60201 s Inc, Evanston, IL 60201 USA
Titolo Testata:
GEOPHYSICAL RESEARCH LETTERS
fascicolo: 13, volume: 28, anno: 2001,
pagine: 2517 - 2520
SICI:
0094-8276(20010701)28:13<2517:VF(SSA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
NMR CHEMICAL-SHIFTS; ANORTHITE-FORSTERITE; LIQUID TRANSITION; GLASSES; SI-29; PHASE; SILICATES; SPECTROSCOPY; CALORIMETRY; SILICON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Tangeman, JA Containerless Res Inc, 906 Univ Pl, Evanston, IL 60201 USA Containerless Res Inc 906 Univ Pl Evanston IL USA 60201 1 USA
Citazione:
J.A. Tangeman et al., "Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry", GEOPHYS R L, 28(13), 2001, pp. 2517-2520

Abstract

Here we report the first synthesis of a forsterite (Mg2SiO4) composition glass as an essentially phase-pure bulk material. Under containerless conditions, with heterogeneous nucleation sites minimized, glass forms by coolingca. 1 mm liquid Mg2SiO4 droplets in oxygen at 700 K/s. Si-29 NMR spectroscopic data indicate that the SiO4 tetrahedra and MgO6 octahedra exist in a corner sharing arrangement in the glass, but upon crystallization the polyhedral units reorganize to form edge-sharing linkages. Transposed temperaturedrop calorimetry shows that the glass is 61.4 +/- 1.3 kJ/mol higher in enthalpy than the crystal.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/17 alle ore 09:09:50