Document Details

Document Type : Article In Journal 
Document Title :
Variational Effect of Mn-Doping and Annealing on the Grain Growth and the PTC of Barium Titanate
(BaTiO3) في مركب تيتانيت الباريوم PTCتباين تأثير كل من التطعيم بالمنجنيز والتليين على النمو الحبيبي وظاهرة ال
 
Subject : Physics 
Document Language : Arabic 
Abstract : P-type BaTiO3, with positive temperature coefficient (PTC), semiconducting ceramics was prepared by solid state reaction. This was achieved by adding a small amount of Mn (0.04 at %). Scanning electron microscope (SEM) was employed to suggest an optimal sintering temperature, which was found to be 1450? for 30 min. The produced samples were annealed at 1200? for periods ranging from 30 min to 48 h. DC measurements on this system were carried out as a function of temperature from room temperature up to 350?. The acceptor- doped BaTiO3, sintered in air, exhibits a strong rise in resistivity just above ferroelectric transition temperature, Tc, which is characteristic of PTC of resistance. The PTC was found to be a grain boundary effect. Annealing and doping were the variables thought to affect the grain boundary. The presence of MN as a dopant was thought to increase the surface states and consequently leads to an enhancement of the PTC effect. Such enhancement may not be available by annealing. Dielectric studies diagrams showed that neither Mn nor annealing time affected the grain bulk resistance of BaTiO3. The most interesting result was the development of second peak following the ferroelectric peak (for ?? versus T ) for pure annealed samples. This peak disappeared in Mn-dopped annealed samples. This behavior related to a partial compensation of the grain boundary surface states by oxygen vacancies in the pure annealed samples. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 13 
Issue Number : 1 
Publishing Year : 1421 AH
2001 AD 
Number Of Pages : 26 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبدالعزيز عبدالله شارع الشهرانيA. A. AL-SHAHRANIResearcher  

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