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 SM ISO690:2012SHPOTYUK, Oleh, KOZDRAS, Andrzej, GOLOVCHAK, Roman, YOVU, M.. Is the marginality of non-reversible heat flow in MDSC experiments a sufficient criterion for self-organization in network glass-formers? In: Physica Status Solidi (C) Current Topics in Solid State Physics, 2011, vol. 8, pp. 3043-3046. ISSN 1862-6351. DOI: https://doi.org/10.1002/pssc.201000742 |
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 Physica Status Solidi (C) Current Topics in Solid State Physics |
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| Volumul 8 / 2011 / ISSN 1862-6351 /ISSNe 1610-1642 | ||||||
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| DOI:https://doi.org/10.1002/pssc.201000742 | ||||||
| Pag. 3043-3046 | ||||||
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Physical ageing caused by 25-years natural storage is studied in glassy As25S75 by conventional DSC technique. The observed effect was recorded as a significant increase in the value of glass transition temperature and endothermic peak area in the vicinity of glass-to-supercooled liquid transition. This result testifies, that marginal values of non-reversible heat flow in temperature-modulated DSC (ΔHnr), observed for as-prepared (or short-term aged) AsxS100-x samples within 22.5 < x < 29.5 compositional range [Ping Chen et al 2008 Phys. Rev. B78 224208], can significantly increase after longer period of physical ageing. Owing to these and previous results on collapse of the reversibility window in AsxSe100-x glasses after long-term physical ageing, we have concluded that marginality of non-reversible heat flow is not a sufficient criterion for express identification of the optimally-constrained self-organized phases in chalcogenide glasses. To make a conclusion on the marginality of ΔHnr, the long-term component of physical ageing should be taken into account. A comparison between conventional or temperature-modulated DSC scans recorded for long-term aged and rejuvenated glass samples is considered as a suitable criterion for physical ageing in glasses and, therefore, for the possibility of their network to be optimally-constrained. |
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| Cuvinte-cheie Chalcogenide glass, DSC, Physical ageing, Reversibility window, self-organization |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Spotiuc, O.I.</dc:creator> <dc:creator>Kozdras, A.</dc:creator> <dc:creator>Golovchak, R.Y.</dc:creator> <dc:creator>Iovu, M.S.</dc:creator> <dc:date>2011-11-01</dc:date> <dc:description xml:lang='en'><p>Physical ageing caused by 25-years natural storage is studied in glassy As<sub>25</sub>S<sub>75</sub> by conventional DSC technique. The observed effect was recorded as a significant increase in the value of glass transition temperature and endothermic peak area in the vicinity of glass-to-supercooled liquid transition. This result testifies, that marginal values of non-reversible heat flow in temperature-modulated DSC (ΔH<sub>nr</sub>), observed for as-prepared (or short-term aged) As<sub>x</sub>S<sub>100-x</sub> samples within 22.5 < x < 29.5 compositional range [Ping Chen et al 2008 Phys. Rev. B78 224208], can significantly increase after longer period of physical ageing. Owing to these and previous results on collapse of the reversibility window in As<sub>x</sub>Se<sub>100-x</sub> glasses after long-term physical ageing, we have concluded that marginality of non-reversible heat flow is not a sufficient criterion for express identification of the optimally-constrained self-organized phases in chalcogenide glasses. To make a conclusion on the marginality of ΔH<sub>nr</sub>, the long-term component of physical ageing should be taken into account. A comparison between conventional or temperature-modulated DSC scans recorded for long-term aged and rejuvenated glass samples is considered as a suitable criterion for physical ageing in glasses and, therefore, for the possibility of their network to be optimally-constrained. </p></dc:description> <dc:identifier>10.1002/pssc.201000742</dc:identifier> <dc:source>Physica Status Solidi (C) Current Topics in Solid State Physics () 3043-3046</dc:source> <dc:subject>Chalcogenide glass</dc:subject> <dc:subject>DSC</dc:subject> <dc:subject>Physical ageing</dc:subject> <dc:subject>Reversibility window</dc:subject> <dc:subject>self-organization</dc:subject> <dc:title>Is the marginality of non-reversible heat flow in MDSC experiments a sufficient criterion for self-organization in network glass-formers?</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>
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