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Titolo:
High-pressure behavior of clinochlore
Autore:
Welch, MD; Marshall, WG;
Indirizzi:
Nat Hist Museum, Dept Mineral, London SW7 5BD, England Nat Hist Museum London England SW7 5BD Mineral, London SW7 5BD, England Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England Rutherford Appleton Lab Didcot Oxon England OX11 0QX 1 0QX, Oxon, England
Titolo Testata:
AMERICAN MINERALOGIST
fascicolo: 11-12, volume: 86, anno: 2001,
pagine: 1380 - 1386
SICI:
0003-004X(200111/12)86:11-12<1380:HBOC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; CHLORITE; PHASE; COMPRESSIBILITIES; REFINEMENT; BRUCITE; GPA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Welch, MD Nat Hist Museum, Dept Mineral, Cromwell Rd, London SW7 5BD, England Nat Hist Museum Cromwell Rd London England SW7 5BD 5BD, England
Citazione:
M.D. Welch e W.G. Marshall, "High-pressure behavior of clinochlore", AM MINERAL, 86(11-12), 2001, pp. 1380-1386

Abstract

The room-temperature bulk modulus of synthetic end-member clinochlore, Mg5AlSi3AlO10(OD)(8), has been determined in the pressure range 0 to 6.5 GPa using neutron powder diffraction: K-o = 75.4(2.7) GPa, K-o' = 4; K-o = 72.3(2.4) GPa, K-o' = 5.4(1.0). A structural comparison is made with the relatedmineral brucite, Mg(OH)(2). Clinochlore is a much stiffer structure than brucite (K-o = 41 - 47 GPa). Both minerals have very similar in-plane compressions of their polyhedral sheets and so their very different bulk moduli arise from different compressibilities normal to the structural layering. Rietveld refinements of neutron-diffraction data for clinochlore collected at0, 1.2, 2.5, and 4.7 GPa reveal that compression normal to the layering isequally partitioned between the interlayer and the 2:1 layer; the octahedral sheets of the brucite-like and 2:1 layers are uncompressed to 4.7 GPa. Increasing pressure strengthens the H3(D3). . . O3 hydrogen bond, which contracts linearly from 1.88(2) Angstrom at 0 GPa to 1.77(2) Angstrom at 4.7 GPa, possibly with a concomitant lengthening of the O6-H3(D3) hydroxyl bond from 1.05(2) Angstrom to 1.10(2) Angstrom over the same pressure range.

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Documento generato il 07/07/20 alle ore 12:49:51