Model modification for calculating lattice volume and size dependent melting temperature of solid nanoparticles

العناوين الأخرى

تعديل نموذج لحساب الحجم الشبيكي و الحجم المعتمد على درجة حرارة انصهار النانوية الصلبة

مقدم أطروحة جامعية

Rauf, Nssar Abd al-Salam

مشرف أطروحة جامعية

Umar, Mustafa Said

أعضاء اللجنة

Said, Salah R.
Taha, Hawkar T.
Fathi, Sabah J.

الجامعة

جامعة صلاح الدين

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

Melting of solids has been investigated in respect with their core electron concentration.

It was found a systematic decrease of melting for groups III, IV, and V with increasing of their core electron concentration except for group elements.

Five models for calculating nanoparticles size dependence melting point were investigated, among them, the Shi-Jiang’s model is found to be the best in comparison with that of the experimental data taken from references.

The Shi-Jiang model is re-derived with the effect of lattice volume of nanoparticles size dependent melting point.

Depending on the models been reported for lattice volume dependence on nanoparticles size for Si, models were derived for nine elements, investigated among groups mentioned above and CdS.

The derived size dependent model was used to calculate the nanoparticles size dependent melting point elements of metals, semiconductors and CdS.

A systematic dependence were found for both the melting entropy Sm and S vib vibrational entropy for elementary solids versus Tm, and also mean bonding length d mean versus the materials surface layer inter-planer distance b.

التخصصات الرئيسية

الفيزياء

الموضوعات

• الأجسام الصلبة

عدد الصفحات

68

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-314365