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Register a new userStudy the ellectriicall propertiies off Co Zn - ferriites doped by Nii at diifferent frequenciies
دراسة الخصائص الكهربائية لفرايت Co Zn المطعم بتراكيز مختلفة من Ni عند ترددات مختلفة
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Added by
Tishreen University ورقة بحثية
Publication date
2015
fields
Physics
and research's language is
العربية
Created by
Shamra Editor
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يتضمن هذا العمل دراسة عينات فرايت كوبالت زنك المطعم بتراكيز مختلفة من النيكل حيث حُضّرت العينات بالطريقة السيراميكية التقليدية , و تحققنا من كون العينات لها تركيب السبينل المكعبي المميز للفرايت و ذلك بأخذ طيف انعراج الأشعة السينية , ثم تمت دراسة بعض الخواص الكهربائية مثل المقاومة النوعية ,الناقلية الكهربائية , ثابت العزل و معامل الفقد. بالإضافة إلى دراسة تغيراتها بدلالة درجة الحرارة و ذلك عند ترددات مختلفة ضمن المجال (Hz( 20 -105.
This work includes study of Co Zn-ferrite samples doped by Ni which prepared by Ceramic method. Then verified that it had spinel structure by using XRD. In addition we study properties such as electrical resistivity , electrical conductivity , dielectric constant and loss coefficient. And also we have studied variations of this properties in terms of temperature at different frequencies in the range of (20 -105) Hz.
References used
WULFSBERG,G. Modern Ferrite technology, crystal structure of ferrites 2002, p52-69
SATTAR, A. A.; ELSAYED, H. M. ; ELSHOKROFY, K. M. Improvement of the magnetic properties of Mn-Ni-Zn ferrite by the non magnetic Al+3 ion substitution. Ain Shams university Egypt journal of Applied sciences 5 , 2005,p120-131
AHMED, M. A.; TAWFIK, A. physical and electrical properties of Ni Al . Journal of material science letters, Tanta university 1991,p250-300
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In this work the study of the total current density distribution for Co(1-x)ZnxFe2O4 ferrite disc where (x=0.4) prepared by using traditional ceramic method as a function of disc radius in the frequency range (1kHz – 1GHz). For achievement of this in
vestigation the disc radius and thickness, electrical conductivity and relative magnetic permeability have been used at room temperature. It is noticed that the total current density becomes concentrated on the outer lateral surface of the disc at 1GHz frequency while it almost stays constant and nearly equals one at other frequencies of the range.
يتضمن هذا البحث تحضير مُركب الانضغاط المغناطيسي عند النسب x= (0.0, 1.0) بالطريقة السيراميكية عند درجة حرارة تلبيد 1200 . دُرست بعض خصائصه البنيوية بتقنية انعراج الأشعة السينية XRD، والميكانيكية بتقنية تحويل فُورييه للأشعة تحت الحمراء FT-IR. وذلك بهد
ف تحديد سرعة وتردد الأمواج التي يمكن توليدها باستخدام المُركب المُحضر. تُظهر النتائج تَشكُل بنية السبينيل المكعب المميز للفرايت، وأن متوسط أبعاد الحبيبة من مرتبة الـ nm. كما لاحظنا عند النسبة x=1.0 زيادة في قيم كل من متوسط أبعاد الحبيبة وثابت الشبكة البلورية، وبالمقابل نقصان قيم كل من الكثافة، ومعامل يونغ للمُركب. تُبين النتائج أيضاً أن تردد الأمواج فوق الصوتية التي يمكن توليدها يقع ضمن المجالين kHz والـ MHz، أما الأمواج فوق الصوتية المتولدة من فرايت النيكل لها سرعة وتردد أعلى مقارنة مع الأمواج فوق الصوتية المتولدة من فرايت الكوبالت .
Ceramic Sample of tin doped pure barium titanate prepared by solid-state reaction at
a sintering temperature of 1350˚C for 3.5h. The electrical properties of ceramic BaTi1-
xSnxO3 studied for the ratios (x= 0, 0.05, 0.07, 0.1, 0.12, 0.15, 0.17), as
a function of
temperature from 0˚C to 170˚C at 1kHz. The maximum value of the dielectric constant
reached to έ=6568 for the content x=0.1 at the temperature Tc=50˚C. The phase transition
for barium titanate was of the first type with γ=1.07. The degree of the transition changed
by increase the ratio of added tin. Where the maximum value of transition degree γ=1.46 at
the ratio x=0.15. Curie constant decreases with increasing ratios of tin added to the ceramic
samples.
Ceramic samples of calcium doped barium titanate have been prepared from highpurity
raw materials by using solid-state reaction method at a sintering temperature of
1350˚C for 3.5h. The electrical properties of ceramic samples Ba1-xCaxTiO3 have bee
n
studied for the ratios (x = 0, 0.1, 0.3, 0.5, 0.7, 1), as a function of temperature within the
range of 25˚C to 220˚C at the frequency 1kHz. Experimental results show that the Currie
point moved within the temperature range from 120˚C to 150˚C by change of calciumadded
ratios. Dielectric constant decreases by increasing the calcium-added ratios. The
maximum value of the dielectric constant rached to έ=6898.85 for barium titanate at the
temperature Tc = 132˚C. We got the high values of the tangent loss angle at both ends of
the studied temperature range. Curie constant decrease of the samples by increasing the
additional calcium ratios.
The target of this study is improving the electrical power systems performance estimation
because of its importance in complex modern networks investment that have a lot of
advanced equipments.
Having a complete representation of the electrical sy
stem makes diagnosis thing much
accurate and reliable which is used in electrical networks operation and maintenance. We
focus in this research on implying different conditions and factors which affect operation
and we use fuzzy petri nets for that purpose because of its characteristics in handling with
incomplete and uncertainty data . we make our simulation on a real diagram of a refinery
to compute its truth degree and discuss the results , we match that adding changing factors
at operation contribute in improving networks estimation accuracy and support decisionmaking
process .
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