| Conţinutul numărului revistei |
| Articolul precedent |
| Articolul urmator |
 |
 126 0 |
 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 |
| EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
 Physica Status Solidi (C) Current Topics in Solid State Physics |
||||||
| Volumul 8 / 2011 / ISSN 1862-6351 /ISSNe 1610-1642 | ||||||
|
||||||
| DOI:https://doi.org/10.1002/pssc.201000742 | ||||||
| Pag. 3043-3046 | ||||||
|
||||||
 Descarcă PDF |
||||||
| Rezumat | ||||||
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. |
||||||
| Cuvinte-cheie Chalcogenide glass, DSC, Physical ageing, Reversibility window, self-organization |
||||||
|
DataCite XML Export
<?xml version='1.0' encoding='utf-8'?> <resource xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://datacite.org/schema/kernel-3' xsi:schemaLocation='http://datacite.org/schema/kernel-3 http://schema.datacite.org/meta/kernel-3/metadata.xsd'> <identifier identifierType='DOI'>10.1002/pssc.201000742</identifier> <creators> <creator> <creatorName>Spotiuc, O.I.</creatorName> <affiliation>Scientific Research Company „CARAT“, Livov. Ukraine, Ucraina</affiliation> </creator> <creator> <creatorName>Kozdras, A.</creatorName> <affiliation>Opole University of Technology, Polonia</affiliation> </creator> <creator> <creatorName>Golovchak, R.Y.</creatorName> <affiliation>Scientific Research Company „CARAT“, Livov. Ukraine, Ucraina</affiliation> </creator> <creator> <creatorName>Iovu, M.S.</creatorName> <affiliation>Institutul de Fizică Aplicată al AŞM, Moldova, Republica</affiliation> </creator> </creators> <titles> <title xml:lang='en'>Is the marginality of non-reversible heat flow in MDSC experiments a sufficient criterion for self-organization in network glass-formers?</title> </titles> <publisher>Instrumentul Bibliometric National</publisher> <publicationYear>2011</publicationYear> <relatedIdentifier relatedIdentifierType='ISSN' relationType='IsPartOf'>1862-6351</relatedIdentifier> <subjects> <subject>Chalcogenide glass</subject> <subject>DSC</subject> <subject>Physical ageing</subject> <subject>Reversibility window</subject> <subject>self-organization</subject> </subjects> <dates> <date dateType='Issued'>2011-11-01</date> </dates> <resourceType resourceTypeGeneral='Text'>Journal article</resourceType> <descriptions> <description xml:lang='en' descriptionType='Abstract'><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></description> </descriptions> <formats> <format>application/pdf</format> </formats> </resource>
|
|
|
