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Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC

Identifieur interne : 000129 ( Main/Repository ); précédent : 000128; suivant : 000130

Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC

Auteurs : RBID : Pascal:14-0048545

Descripteurs français

Pascal (Inist)
- Calorimétrie différentielle balayage, Enthalpie, Addition argent, Phase cristalline, Cristallisation, Diffraction RX, Concentration impureté, Transition vitreuse, Chaleur massique, Composition chimique, Verre chalcogénure, Tellurure de germanium, Tellurure d'indium.

English descriptors

KwdEn :
- Chalcogenide glasses, Chemical composition, Crystalline phase, Crystallization, Differential scanning calorimetry, Enthalpy, Germanium tellurides, Glass transition, Impurity density, Indium tellurides, Silver additions, Specific heat, XRD.

Abstract

Alternating Differential Scanning Calorimetric (ADSC) studies on quaternary Ge₁₅Te_80-xln₅Ag_x glasses show the non-reversing enthalpy (ΔH_NR) at T_g to exhibit a broad global minimum in the 8%≤x≤ 16% range of Ag, an observation that is taken evidence for existence of an Intermediate Phase (IP) in that range. Glasses at x < 8% are in the flexible phase while those at x > 16% in the stressed-rigid phase. The nature of crystalline phases formed upon crystallization of bulk glasses are elucidated by XRD studies, and reveal presence of Te, GeTe, Ag₈GeTe₆, AgTe, In₂Te₃ and In₄Te₃ phases. These experiments also reveal that the fraction of Ag- bearing phases increases while those of Te- bearing ones decreases with increasing x. suggesting progressive replacement of Te-Te bonds by Ag-Te bonds.

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Pascal:14-0048545

Le document en format XML

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<author><name sortKey="Sreevidya Varma, G" uniqKey="Sreevidya Varma G">G. Sreevidya Varma</name>
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<country>Inde</country>
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<author><name sortKey="Das, Chandasree" uniqKey="Das C">Chandasree Das</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Electrical and Electronics Engineering, BMS College of Engineering</s1>
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<s3>IND</s3>
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<country>Inde</country>
<wicri:noRegion>Bangalore 560 019</wicri:noRegion>
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<author><name sortKey="Asokan, S" uniqKey="Asokan S">S. Asokan</name>
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<term>Germanium tellurides</term>
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<front><div type="abstract" xml:lang="en">Alternating Differential Scanning Calorimetric (ADSC) studies on quaternary Ge<sub>15</sub>
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 glasses show the non-reversing enthalpy (ΔH<sub>NR</sub>
) at T<sub>g</sub>
 to exhibit a broad global minimum in the 8%≤x≤ 16% range of Ag, an observation that is taken evidence for existence of an Intermediate Phase (IP) in that range. Glasses at x < 8% are in the flexible phase while those at x > 16% in the stressed-rigid phase. The nature of crystalline phases formed upon crystallization of bulk glasses are elucidated by XRD studies, and reveal presence of Te, GeTe, Ag<sub>8</sub>
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Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC

Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

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Pour manipuler ce document sous Unix (Dilib)

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