Improvement of electric and magnetic properties for li spinel ferrite by divalent Zn2+ ions substitution

العناوين الأخرى

تأثير أيونات الزنك الثنائية على الخواص الكهربية و المغناطيسية لليثيوم اسبنل فريت

مقدم أطروحة جامعية

Abu Musa, Zanah Awdah Muhammad

مشرف أطروحة جامعية

Dawud, Husayn Abd al-Karim

أعضاء اللجنة

Tayih, Sufyan Abd al-Rahman
Hamadah, Majdi Salim

الجامعة

الجامعة الإسلامية

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

فلسطين (قطاع غزة)

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2016

الملخص الإنجليزي

In the present work magnetic, electric and dielectric properties are investigated for mixed ferrite Li0.5(1-x)ZnxFe2.5-0.5xO4 ( where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1) which are prepared from high purity oxides using standard ceramic technique.

The magnetization (M) is measured at room temperature in the range of the applied field from 148 A.m-1 up to 1856 A.m-1.

The results indicated that the magnetization increased as increasing Zn2+ ions for samples of (x ≤ 0.6) while samples of (x ≥ 0.8) were considered to be paramagnetic at room temperature which have no magnetization .

DC conductivity ( ) is measured as a function of temperature, the relation between ln with temperature indicates that the conductivity increases with increasing the temperature which prove that the samples has a semiconductor behavior.

Also the relation between lnT and temperature show a change in the slope which is attributed to the change of samples from ferrimagnetic to paramagnetic, Curie point, ( C T ).

To determine C T , the inductance was measured as a function of temperature.

The inductance increased until C T , then decreased sharply.

C T is found to decrease with increasing the Zn2+ ions.

Dielectric constant ( ), dielectric loss tangent ( tan ) and AC conductivity ( AC  ) have been investigated in the frequency range of (10 10 )Hz 4 6  at room temperature.

It is found that the value of  decreases continuously with increasing the frequency, while AC  increases with increasing frequency until certain point then it seems to be constant with change of frequency.

Experimental results of tan show maxima points at certain frequency and these maxima found to be shifted to lower frequency.

التخصصات الرئيسية

الفيزياء

عدد الصفحات

77

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-735358