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Register a new userStudy of certain mechanical and thermal properties of ferrite by means of IR and TG/DTA
دراسة بعض الخصائص الميكانيكية و الحرارية للفرايت باستخدام الوسائل TG/DTA, IR
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حُضِّر مسحوق الفرايت، حيث (x= 0.5) بالطريقة السيراميكية التقليدية ثنائية التلبيد (CCDS). و حسبنا ثابت قوة الاهتزاز K للمواقع الرباعية و الثمانية في شبكة الفرايت، و ثابت المرونة C11، و معامل الانضغاط B . كما تم حساب سرعة الموجة المرنة الطولية و القصية وفق اتجاه أحرف البلورة المكعبية للعينة. بعد ذلك، حددنا تردد عتبة الانتقالات الالكترونية من طيف IR. علاوة على ذلك، تم حساب الحركية الجرية في المواقع الرباعية و الثمانية، و تغيّر عزم ثنائي القطب المغناطيس للرابطة. تم رسم العلاقة بين المساحة تحت القمم الماصة للحرارة (الانتالبية) في مخطط التحليل لحراري التفاضلي و الوزني TG/DTA مع تغيّر الوزن TG%، و كذلك السعة الحرارية للعينة تحت ضغط ثابت Cp مع درجة حرارة معالجتها. و لوحظ أن لهذه السعة الحرارية قيمة حدية عند درجة الحرارة 175.
errite (x=0.5) was prepared by a well-known conventional ceramic double sintering method (CCDS). Force constant K was calculated for tetrahedral and octahedral sites. The elastic constant C11, bulk modulus B , longitudinal and shear wave velocities were calculated. Threshold frequency for electronic transition was determined using IR spectra. In addition, the drift mobility for tetrahedral and octahedral sites, as well as magnetic dipole moment changes for bond were determined. The area beneath endothermic peaks was correlated to the weight change TG%. On the other hand, the heat capacity under constant pressure CP was correlated to sample treatment temperature. It has been noticed that the CP has a critical value at 175.
References used
Mah Rukh Siddiquash, - Effect of Doping of Various Metal cations on Structural, Electrical and Magnetic Properties of Nano –cobalt Ferrites. Dissertation submitted to the Quaid – i- Azam Uni. Islamabad,2008,p.5
Gisbert Grossmann et al., – Struktur und Bindung-atome und Molekϋle, VEB Deutscher Verlag fϋr Grundstoffindustrie, Leipsig, 1985, p.167
Dawoud H. et al., a structural study of CuZn-ferrite by infrared spectra, J.Al-Aqsa Unv., 2006,247-262
Mazen S., Abed Allah M., Nakhaa R.and Zaki H., Mat. Chem.and Phys., 1993, 34- 35
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