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Titolo:
CONTROL OF PHASE-FORMATION AND FILM ORIENTATION BY MOLAR VOLUME STRESS DURING MGO-GEO2 THIN-FILM SOLID-SOLID REACTIONS
Autore:
BLUM W; HESSE D;
Indirizzi:
MAX PLANCK INST MIKROSTRUKTURPHYS,WEINBERG 2 D-06120 HALLE GERMANY MAX PLANCK INST MIKROSTRUKTURPHYS D-06120 HALLE GERMANY UNIV GOTTINGEN,SONDERFORSCH BEREICH 345 D-37073 GOTTINGEN GERMANY
Titolo Testata:
Solid state ionics
fascicolo: 1-2, volume: 95, anno: 1997,
pagine: 41 - 49
SICI:
0167-2738(1997)95:1-2<41:COPAFO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
OLIVINE SPINEL TRANSFORMATION; POLYMORPHS ORTHO-PYROXENE; BINARY DIFFUSION COUPLES; CRYSTAL-STRUCTURES; GROWTH-KINETICS; MG2GEO4 OLIVINE; CLINOPYROXENE; TRANSITION; MECHANISM; MGGEO3;
Keywords:
PHASE FORMATION; THIN FILM; STRESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
W. Blum e D. Hesse, "CONTROL OF PHASE-FORMATION AND FILM ORIENTATION BY MOLAR VOLUME STRESS DURING MGO-GEO2 THIN-FILM SOLID-SOLID REACTIONS", Solid state ionics, 95(1-2), 1997, pp. 41-49

Abstract

Experimental investigations were performed on the role molar volume stresses play during thin-film solid-solid reactions and phase transformations. Reactions and transformations in the thin-film system MgO-GeO2 were studied under two different conditions, viz. a planar thin-filmgeometry on a rigid substrate involving stress, and a microbeam geometry ensuring the immediate relaxation of any stresses via microbeam bending. Induced by reactions or transformations, respectively, the formation of the different phases (MgGeO3, Mg2GeO4, Mg28Ge10O48) and theirpolymorphs (clino- and orthopyroxene, spinel and olivine) was investigated by RBS, XRD, TEM/SAED and EDX as well as by in situ-TEM-observations applying a double-tilt heating holder. The results show that phase formation under thin-film conditions involving stress indeed differsfrom that under stress-free conditions. Stability ranges and transformation temperatures were distinctly shifted under conditions involvingstress. Moreover, the crystallographic orientation of the olivine phase was stress-dependent, The observations are discussed in terms of different phase transformation mechanisms and a contribution of the stress enthalpy to the Gibbs free energy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 19:09:39