A relation between temperature coefficient of resistance (α) and material parameters is deduced for PTCR ceramics based on Heywang model. It shows that α is proportional to Q2/(NdC0), where Q is acceptor charge density, Nd is donor density and C0 is Curie constant. Q, Nd and C0 were measured by means of impedance spectroscopy method. The calculated α s are in reasonable agreement with directly measured ones.
Ferroelectrics
Volume 247, 2000 - Issue 1
![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})