Direct density determination of low- and high-density glassy polyamorphs following a liquid–liquid phase transition in Y2O3–Al2O3 supercooled liquids

Paul F. McMillan*, Martin C. Wilding

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

21 Dyfyniadau (Scopus)

Crynodeb

Evidence has been presented for a density-driven phase transition occurring between supercooled liquids in the system Y2O3-Al2O3. The high- and low-density liquids were quenched to metastably coexisting glasses. Chemical analysis showed the compositions of the two glasses to be identical, and it was inferred that they differed in their densities and entropies. The entropy difference has been verified by calorimetry. Here, we confirm that the chemical compositions of the glassy materials derived from the high- and low-temperature liquids are identical. We present a direct density determination of the two. glasses using sink-float techniques. The measured densities are 3.72(3) g/cm(3) for the glass derived from the high-temperature liquid (i.e., the high-density amorphous or HDA polyamorph), and 3.58(1) g/cm(3) for the low-temperature (low-density, LDA) polyamorph. (C) 2007 Elsevier B.V. All rights reserved.

Iaith wreiddiolSaesneg
Tudalennau (o-i)1015-1025
Nifer y tudalennau11
CyfnodolynJournal of Non-Crystalline Solids
Cyfrol354
Rhif cyhoeddi10-11
Dyddiad ar-lein cynnar14 Medi 2007
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 01 Chwef 2008

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