عنوان

بررسی ساخت شیشه و شیشه- سرامیک سیستم‮‭Ge -As- Se‬با استفاده از جوانه زاهای مختلف

شماره

‭۱۸۷۷۷پ‬

زبان متن نوشتاري يا گفتاري و مانند آن

per

عنوان اصلي

بررسی ساخت شیشه و شیشه- سرامیک سیستم‮‭Ge -As- Se‬با استفاده از جوانه زاهای مختلف

نام نخستين پديدآور

/سعیده احمدپور

نام ناشر، پخش کننده و غيره

: فنی مهندسی مکانیک

تاریخ نشرو بخش و غیره

، ‮‭۱۳۹۶‬

نام توليد کننده

، افشاری

متن يادداشت

چاپی

متن يادداشت

Chalcogenide glasses and glass- ceramics are new materials that they exhibit a good transparency in the infrared region(0.8-12m). Due to their flexible structure and unlimited ability for doping and alloying are promising materials for chemical sensors photovoltaic devices, thermal imagery, image detector have received a great deal of attention Main purposes of the present research are investigation of the ZnSe and Sn roles on their production, crystallization behavior, optical and physical properties of Se-As-Ge glass. In this research according to previous studies, the appropriate composition was chosen in the Se-As-Ge system, and the effects of ZnSe and Sn additives were investigated in the ratio of 0.25, 0.5, 0.75, 1 and 1, 3, 6. molar on the base glass, respectively. First, the raw material mixture was poured into the quartz ampules and sealed with acetylene flame, Then, to get the homogenous composition it melted at a temperature range of 850-950 in the oscillating furnace for 8hr. Obtained samples quenched in a salt bath (sodium nitrate + potassium nitrate) at a temperature of a 250 , annealing heat treatment was performed at 300-320 . The thermal analysis of DSC was used to determine the temperature of the heat treatment. X-ray diffraction patterns (XRD) of specimens were studied to ensure that no crystalline phases were formed in the glass structure. For structural studies and calculation of optical parameters, FT-IR spectra and UV-Vis spectra were investigated.Field emission scanning electron microscope was used to observe the microstructure of the glass- ceramics. The transmittance spectra of glasses show exceeds 50. transmission in the range of 8 to 12 m. On the basis of the fact that Sn and ZnSe additives have a network former role, glasses containing various amounts of Sn and ZnSe mostly of the crystallization properties became more desirable materials. It is also due to the two role of the network maker and the modificative of ZnSe and Sn additives two different trends were observed in the variation of the optical parameters, which is influenced by the percentage of the additive used. Glasses containing 6. Sn and 0.75

جزئيات پايان نامه و نوع درجه آن

کارشناسی ارشد

نظم درجات

مهندسی مواد - گرایش سرامیک

زمان اعطا مدرک

‮‭۱۳۹۶/۰۶/۱۱‬

کسي که مدرک را اعطا کرده

تبریز

متن يادداشت

شیشه و شیشه سرامیک‌های کالکوژناید مواد جدیدی هستند که در ناحیه مادون قرمز ‮‭۸‬ تا ‮‭۱۲‬ ‮‭m‬ قابلیت عبور بالایی دارند .به دلیل ساختار منعطف و توانایی در عدم محدودیت به آلائیدن با عناصر مختلف، برای استفاده در سنسور های شیمیایی، دستگاه های فتوولتاییک، تصویرسازی حرارتی، آشکارسازهای تصویر و ... توجه محققین زیادی را به خود جلب نموده‌اند .هدف اصلی از این تحقیق بررسی تاثیر افزودنی‌های ‮‭ZnSe‬ و ‮‭Sn‬ بر ساخت، رفتار تبلور و ویژگی‌های نوری و فیزیکی شیشه کالکوژنایدی‮‭Ge -As- Se‬است .در این پژوهش بر اساس مطالعات قبلی ترکیب مناسب در سیستم‮‭Ge - As- Se‬ انتخاب شد و تاثیر افزودنی های ‮‭ZnSe‬ و ‮‭Sn‬به ترتیب در نسبت‌های‮‭۲۵/۰‬ ،‮‭۵/۰‬ ،‮‭۷۵/۰‬ ، ‮‭۱‬ و‮‭۱‬ ،‮‭۳‬ ، ‮‭۶‬ درصد مولی بر روی شیشه پایه مورد بررسی قرار گرفت .ابتدا مخلوط مواد اولیه داخل آمپول‌های کوارتزی ریخته شد و توسط شعله استیلنی مهر و موم شد، سپس در محدوده دمایی‮‭۸۵۰ - ۹۵۰‬در کوره نوسانی به مدت ‮‭h۸‬ برای بدست آوردن ترکیب همگن ذوب شد .نمونه‌های بدست آمده در حمام نمک) نیترات سدیم + نیترات پتاسیم (با دمای ‮‭۲۵۰‬ کوئنچ شد، عملیات حرارتی آنیل در دمای‮‭۳۰۰ - ۳۲۰‬انجام گرفت .با استفاده از دماهای بیشینه تبلور حاصل از آنالیز‮‭DSC‬ ، شرایط عملیات تبلور شیشه‌ها تعیین و نمونه‌های شیشه سرامیکی ساخته شدند .برای حصول اطمینان از عدم تشکیل فازهای بلوری در ساختار شیشه، الگوی پراش اشعه ایکس ‮‭XRD‬ نمونه‌ها مورد مطالعه قرار گرفت .برای مطالعات ساختاری و محاسبه پارامترهای اپتیکی، طیف‌های‮‭IR - FT‬و طیف‌های‮‭Vis - UV‬مورد بررسی قرار گرفتند .از میکروسکوپ ‮‭FESEM‬ نیز برای مشاهده ریز ساختار و مورفولوژی شیشه سرامیک‌ها استفاده شد

متن يادداشت

Chalcogenide glasses and glass- ceramics are new materials that they exhibit a good transparency in the infrared region(0.8-12m). Due to their flexible structure and unlimited ability for doping and alloying are promising materials for chemical sensors photovoltaic devices, thermal imagery, image detector have received a great deal of attention Main purposes of the present research are investigation of the ZnSe and Sn roles on their production, crystallization behavior, optical and physical properties of Se-As-Ge glass. In this research according to previous studies, the appropriate composition was chosen in the Se-As-Ge system, and the effects of ZnSe and Sn additives were investigated in the ratio of 0.25, 0.5, 0.75, 1 and 1, 3, 6 molar on the base glass, respectively. First, the raw material mixture was poured into the quartz ampules and sealed with acetylene flame, Then, to get the homogenous composition it melted at a temperature range of 850-950 in the oscillating furnace for 8hr. Obtained samples quenched in a salt bath (sodium nitrate + potassium nitrate) at a temperature of a 250 , annealing heat treatment was performed at 300-320 . The thermal analysis of DSC was used to determine the temperature of the heat treatment. X-ray diffraction patterns (XRD) of specimens were studied to ensure that no crystalline phases were formed in the glass structure. For structural studies and calculation of optical parameters, FT-IR spectra and UV-Vis spectra were investigated.Field emission scanning electron microscope was used to observe the microstructure of the glass- ceramics. The transmittance spectra of glasses show exceeds 50 transmission in the range of 8 to 12 m. On the basis of the fact that Sn and ZnSe additives have a network former role, glasses containing various amounts of Sn and ZnSe mostly of the crystallization properties became more desirable materials. It is also due to the two role of the network maker and the modificative of ZnSe and Sn additives two different trends were observed in the variation of the optical parameters, which is influenced by the percentage of the additive used. Glasses containing 6 Sn and 0.75 ZnSe, due to the network former characteristics of these additives, showed optimal optical properties, crystallization, increased glass transition temperature and increased hardness

مستند نام اشخاص تاييد نشده

احمدپور، سعیده

مستند نام اشخاص تاييد نشده

دکتر محمد رضوانی، استاد راهنما

مستند نام اشخاص تاييد نشده

دکتر محمد رضازاده، استاد مشاور

يادداشت عمومي

سیاه و سفید

وضعیت فهرست نویسی

نمایه‌سازی قبلی