RESEARCH ARTICLE

 

Electrical and optical properties of nanosized perovskite-type La_0.5Ca_0.5MO₃ (M=Co,Ni) prepared using a sol-gel method

 

 

Mohammad Yazdanbakhsh^I; Haman Tavakkoli^I; Seyed Mohammad Hosseini^{II, *}

^IDepartment of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 91799, Iran
^IIMaterials and Electroceramics Laboratory, Department of Physics, Ferdowsi University of Mashhad, Mashhad 91799, Iran

 

 

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ABSTRACT

In this paper the uniform nanopowders of La_0.5Ca_0.5CoO_3-δ and La_0.5Ca_0.5NiO_3-δ (LCCO and LCNO) were synthesized from nitrates of the constituent metal ion, citric acid (CA), and ethylene glycol (EG) by the combined citrate-ethylene glycol (EG) method. These nanopowders were also characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), SEM-EDX analysis and Brunauer-Emmett-Teller (BET) method XRD results show that single perovskite phase was completely formed after calcination at 750 °C. Fourier transform infrared (FTIR) spectra were measured for the xerogels and powder samples after calcination. In addition, the TEM images show that the average particle size of nanoparticles is approximately 25-32 nm in diameter. The ultraviolet (UV) spectrum was used to calculate the absorption coefficient (a) as a function of photon energy (hv) and the obtained results indicate that the optical band gap energy (E_g) for LCNO sample is smaller than that of LCCO. Finally, the temperature dependence of the specific resistivity of LCCO and LCNO sintered at 1100 °C was compared and revealed that the resistivity of both compounds decreases exponentially by increasing the temperature.

Keywords: La_0.5Ca_0.5MO₃, perovskite, sol-gel process, nanopowder, optical properties

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Acknowledgements

The authors wish to thank the financial support of Ferdowsi University of Mashhad for this project (P439) and are grateful to Materials and Electroceramics Laboratory of department of physics for electrical measurements. We also acknowledge R. Pesian and N. Hashemian for taking TEM images and EDX analysis at the central lab of Ferdowsi University of Mashhad.

 

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Received 28 March 2011
Revised 19 June 2011
Accepted 29 June 2011

 

 

* To whom correspondence should be addressed. E-mail: sma_hosseini@yahoo.com