Electrical conduction in calcium yttrium titanium cobalt oxide Ca<sub>1-x</sub>Y<sub>x</sub>Ti<sub>1-x</sub>Co<sub>x</sub>O<sub>3</sub> (x<or=0.15)
O Parkash; H S Tewari; V B Tare; D Kumar; O Parkash; Sch. of Mater. Sci. & Technol., Inst. of Technol., Banaras Hindu Univ., Varanasi, India; H S Tewari; Sch. of Mater. Sci. & Technol., Inst. of Technol., Banaras Hindu Univ., Varanasi, India; V B Tare; Sch. of Mater. Sci. & Technol., Inst. of Technol., Banaras Hindu Univ., Varanasi, India; D Kumar; Sch. of Mater. Sci. & Technol., Inst. of Technol., Banaras Hindu Univ., Varanasi, India
Журнал:
Journal of Physics D: Applied Physics
Дата:
1993-04-14
Аннотация:
The DC resistivity and Seebeck coefficient have been measured as a function of temperature in the system Ca<sub>1-x</sub>Y<sub>x</sub>Ti<sub>1-x</sub>Co<sub>x</sub>O<sub>3</sub> for the samples with x<or=0.15 in the range 300-800 K. AC conductivity has been measured as a function of temperature and frequency. Results of these measurements show that electrical transport occurs mainly by a Debye-type loss process at temperatures less than 375 K and by excitation of charge carriers at localized states close to band edges and hopping among the localized sites.
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