Temperature and Frequency Dependence Electrical Properties of Zn_{1-x}Ca_{x}O Nanoceramic

• Authors: T. Das , B. Das , K. Parashar , S. Parashar
• Languages of publication: EN

Abstracts

EN

This work reports the temperature and frequency dependence electrical properties of Ca doped ZnO (Zn_{1-x}Ca_{x}O, x=0.01) nanoceramic synthesized by solid state reaction method. The X-ray spectra show that the synthesized powder has hexagonal wurtzite structure with space group P6₃mc. The average crystallite size decreases with Ca doping. The increase in oxygen positional parameter (u) indicates lattice distortion in the crystal structure. Doping with Ca caused a slight shift in the (101) plane peak towards lower diffraction angle. The formation of pores in field emission scanning electron microscopy micrograph may be due to the defect created by Ca substitution. The electrical property was investigated by impedance spectroscopy in the temperature range 300-500°C. The synthesized sample shows temperature dependence relaxation phenomena and negative temperature coefficient of resistance effects. Electrical conductivity (σ_{ac}) increases with increase in temperature as well as with frequency due to the drift mobility of electrons and hole by hopping conduction. Dielectric constant was found to decrease with increase in frequency and temperature. This decreases drastically in the magnitude of approximately < 10 times than the corresponding undoped one.

Keywords

EN

61.05.cP; 68.37.xy; 84.37.+q; 72.80.Lc; 77.22.Ch

Discipline

• 84.37.+q: Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 130
• Issue: 6
• Pages: 1358-1362

Dates

published

2016-12

received

2016-03-17

(unknown)

2016-11-18

Contributors

author

T. Das

• Centre for Nanotechnology, School of Applied Sciences, KIIT University, Bhubaneswar-751024, Odisha, India

author

B. Das

• Centre for Nanotechnology, School of Applied Sciences, KIIT University, Bhubaneswar-751024, Odisha, India

author

K. Parashar

• Centre for Nanotechnology, School of Applied Sciences, KIIT University, Bhubaneswar-751024, Odisha, India

author

S. Parashar

• Centre for Nanotechnology, School of Applied Sciences, KIIT University, Bhubaneswar-751024, Odisha, India

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Identifiers

DOI

10.12693/APhysPolA.130.1358