کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5782954 | 1637513 | 2017 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and properties of lead silicate glasses and melts
ترجمه فارسی عنوان
ساختار و خواص عینک سیلیکات سرب و ذوب
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کلمات کلیدی
سرب سیلیکات، طیف سنجی رامان، ویسکوزیته، عینک، ساختار عینک و ذوب،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Viscosity, density and glass transition temperature measurements were performed on the simple PbO-SiO2 system with increasing PbO content from 5 to 70Â mol%. The results of these analyses have been complemented by spectroscopic studies (Raman & X-ray Absorption Spectroscopy) in order to link macroscopic properties to structural information at short- and middle-range order. A strong decrease of the viscosity is observed even with the incorporation of 5Â mol% PbO, and this decrease goes on with the increase of PbO content. This effect is confirmed by the continuous decrease of the glass transition temperature with increasing PbO content. Based on our interpretations of Raman spectra, which show similarities to alkali or earth-alkaline-silicate glasses, these effects appear to arise from depolymerization of the silica network. Consequently, lead acts as a network modifier even at low content. Although, it could form PbO4 tetrahedra when it is present in large quantities, it cannot be asserted that lead acts as a network former at high lead content.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 461, 20 June 2017, Pages 104-114
Journal: Chemical Geology - Volume 461, 20 June 2017, Pages 104-114
نویسندگان
Ilyes Ben Kacem, Laurent Gautron, Daniel Coillot, Daniel R. Neuville,