کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5441114 | 1510376 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On relative merits of the criteria of glass formation and effects of ultraviscous liquid properties
ترجمه فارسی عنوان
در مورد خواص نسبی معیارهای تشکیل شیشه و اثرات خواص مایع فوق العاده ذهنی
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
A liquid is said to become glass when cooled to a temperature T infinitesimally below the temperature Tl â g. According to the glass-formation criteria, either, (I) Ïs = CI/qc at Tl â g, or, (II) (dÏs/dT) â
CII/qc, or, (III) (Ïs/T)Â â
 CIII/qc, where Ïs is taken as equal to Ïα, the relaxation time of the α-process, qc is the cooling rate, and CI = 16.67 K, CII â
 1, and CIII â
 1. Criterion I is generally used in glass phenomenology, criterion II was related to the effective enthalpy of activation in the Tl â g range and recommended over criterion I, and criterion III was used for discussing the pressure dependence of Tl â g. We investigate their merits by comparing formally the criteria-based Ïs at Tl â g in an ideal case against Ïα at T = Tl â g, and discuss the effects of using the glass-liquid transition temperature, Tg â l, the fictive temperature, Tf, and the midpoint temperature of the Cp-T plots as alternatives to Tl â g. The three criteria yield basically different results. Moreover, Tl â g differs from the kinetic freezing temperature of the α-relaxation process, and CI varies with both qc and the material. We suggest that contributions from several properties of ultraviscous liquids affect the shape of the Cp-T scans from which Tl â g is determined. The findings have consequences for interpretations in which Ïs is used as Ïα.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 471, 1 September 2017, Pages 439-445
Journal: Journal of Non-Crystalline Solids - Volume 471, 1 September 2017, Pages 439-445
نویسندگان
G.P. Johari,