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polyamorphism

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Journal Article
Published: 01 December 2005
The Canadian Mineralogist (2005) 43 (6): 1921-1958.
... ( e.g. , triclusters) that are not common in crystalline phases. Furthermore, polyamorphic phase-transitions may occur at high temperature and pressures; the application of new theoretical models like mean field-constraint hypothesis suggests that several glass phenomena, and probably melt phenomena...
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Journal Article
Journal: Elements
Published: 01 October 2006
Elements (2006) 2 (5): 269-273.
... octahedral coordination in glasses with local charge compensation ( Farges et al. 1991 ). This unusual coordination, encountered in alkali zirconosilicates, was previously suspected from Zr geochemistry ( Watson 1979 ). “Polyamorphism,” implying a relatively abrupt structural change, is a widely...
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Journal Article
Published: 01 January 2010
Reviews in Mineralogy and Geochemistry (2010) 71 (1): 437-463.
... for liquid-liquid unmixing is at a temperature well below the stable liquid field, that is within the thermodynamic stability field of solid MgSiO 3 (enstatite), so it is very unlikely that polyamorphism will ever be observed in this liquid. However, other silicate liquid compositions, such as CaAl 2 Si 2 O...
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Journal Article
Published: 01 May 2009
American Mineralogist (2009) 94 (5-6): 693-703.
... for anomalously large degree of polymerization in Mg 2 SiO 4 glass and melt. American Minerologist , 93 , 946 –949. Senker, J. and Rossler, E. ( 2001 ) Triphenyl phosphate: a candidate for liquid polyamorphism. Chemical Geology , 174 , 143 –156. Skibinsky, A., Buldyrev, S.V., Franzese, G., Malescio...
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Journal Article
Published: 01 January 2006
Reviews in Mineralogy and Geochemistry (2006) 63 (1): 275-311.
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Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 711-720.
...-selective time-resolved laser fluorescence spectroscopy of Eu 3+ in calcite . J. Colloid Interface Sci. , 321 , 323 – 331 . Fernandez-Martinez , A. , Kalkan , B. , Clark , S.M. , Waychunas , G.A. ( 2013 ): Pressure-induced polyamorphism and formation of ‘Aragonitic...
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Journal Article
Published: 01 March 2019
European Journal of Mineralogy (2019) 31 (2): 231-236.
.... , Gebauer D. , Sainz-Díaz C.I. ( 2012 ): Calcium carbonate polyamorphism and its role in biomineralization: How many amorphous calcium carbonates are there? Angew. Chemie – Int. Ed. , 11960 – 11970 . Croitoru C. , Spirchez C. , Cristea D. , Lunguleasa A. , Pop...
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Journal Article
Published: 01 February 2011
American Mineralogist (2011) 96 (2-3): 283-287.
.... , and Deschamps , T. ( 2007 ) Polyamorphism: Path to new high density glasses at ambient conditions . Journal of Non-Crystalline Solids , 353 , 4208 – 4211 . Champagnon , B. , Martinet , C. , Boudeulle , M. , Vouagner , D. , Coussa , C. , Deschamps , T. , and Grosvalet , L...
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Journal Article
Journal: Elements
Published: 01 October 2006
Elements (2006) 2 (5): 265-268.
... that are bonded to only one network former Order (structural) - Applied to arrangements of atoms that can be described by well-defined bond angles and distances and/or non-random distributions of adjacent cations or anions Polyamorphism - Two liquids or glasses with the same composition...
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Journal Article
Published: 01 September 2018
American Mineralogist (2018) 103 (9): 1468-1472.
... Reports , 6 , 19902 . Winkel , K. Hage , W. Loerting , T. Price , S.L. , and Mayer , E. 2007 Carbonic acid: From polyamorphism to polymorphism . Journal of the American Chemical Society , 129 , 13,863 – 13,871 . Wu , C.Y.R. Judge , D.L. Cheng , B.-M...
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Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2004
DOI: 10.1180/EMU-notes.6.13
EISBN: 9780903056519
... domains with distinct short-range structures. At low pressure, a tetrahedral framework structure ( T ) prevails, then, an intermediate domain with a mixture of [4] Ge and [6] Ge appears, and at higher pressure, the Oc domain corresponds to a structure with [6] Ge. The notion of polyamorphism would...
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Journal Article
Published: 01 January 2006
Reviews in Mineralogy and Geochemistry (2006) 63 (1): 171-204.
...-angle- and small-angle-scattering. Also, the incoherent scattering from protons or deuterons is no longer a problem with X-ray diffraction, and the insensitivity to scattering from protons and deuterons is even an advantage in this particular case, as this polyamorphism is sufficiently expressed...
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Journal Article
Published: 01 August 2014
European Journal of Mineralogy (2014) 26 (4): 523-535.
... ). Moreover, it was shown that the formation of sea-urchin spine and nacre proceeds through CaCO 3 polyamorphs ( e.g. Cartwright et al. , 2012 ). Thus, the above observations could fit with the formation of ACC particles stabilized by magnesium ions and SOM that then evolved in a given crystalline phase...
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Journal Article
Journal: Elements
Published: 01 February 2006
Elements (2006) 2 (1): 23-30.
... have also been used to study processes governing the modification of glass and melt structures at high pressure (polyamorphism). Determination of the structure of high-density glasses requires in situ studies since coordination changes are reversible ( Majérus et al. 2004b ). However...
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Journal Article
Published: 01 March 2019
European Journal of Mineralogy (2019) 31 (2): 217-229.
... , J.H.E. , Checa , A.G. , Gale , J.D. , Gebauer , D. , Sainz-Díaz , C.I. ( 2012 ): Calcium carbonate polyamorphism and its role in biomineralization: How many amorphous calcium carbonates are there? Angew. Chem. Int. Ed. , 51 , 11960 – 11970 . Checa , A.G. , Cartwright...
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Journal Article
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1304-1314.
... coordination species. The simulated MgSiO 3 glass shows no clear sign of polyamorphic phase transition, which has been proposed to occur in other systems including silica glass ( Zha et al. 1994 ). We find continuous structural changes along with a smooth increase (decrease) in density with compression...
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Journal Article
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 724-735.
... before the nucleation towards a low-energy state. This hypothesis would be within the recent concept of polyamorphism that have been found in carbonates ( Cartwright et al. 2012 ), where different amorphous phases can exist and induce the nucleation of the corresponding crystal polymorph. In our minerals...
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Journal Article
Published: 01 January 2007
American Mineralogist (2007) 92 (1): 166-173.
..., the position of the “glass hump” for the recovered sample appeared to move to the lower energy value (larger d -spacing) relative to that for the phase under compression. This behavior suggests possible relaxation of the glass structure upon release of pressure or reflects existence of polyamorphs—amorphous...
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Journal Article
Published: 01 March 2005
European Journal of Mineralogy (2005) 17 (2): 223-232.
.... , Reynard , B. ( 1994 ): A study of SiO 2 glass and supercooled liquid to 1950K via high temperature Raman spectroscopy . Geochim. Cosmochim. Acta , 58 , 3653 – 3664 . McMillan , P.F. , Wilson , M , Wilding , M.C. ( 2003 ): Polyamorphism in aluminate liquids . J. Phys...
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Journal Article
Published: 01 August 2017
American Mineralogist (2017) 102 (8): 1657-1666.
... ) High-pressure effects on liquid viscosity and glass transition behaviour, polyamorphic phase transitions and structural properties of glasses and liquids . Journal of Non-Crystalline Solids , 355 , 722 – 732 . Neuville , D.R. , Cormier , L. , Montouillout , V. , Florian , P...
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