SrTi_1­xNi_xO₃ nanoparticles: synthesis and characterisation
by Doan Thi Thuy Phuong, Le Van Hong, Nguyen Van Minh
International Journal of Nanotechnology (IJNT), Vol. 8, No. 3/4/5, 2011

Abstract: We present the synthesis of SrTi_1­xNi_xO₃ (STNO) (x = 0.00, 0.10, 0.20, 0.30, 0.40, 0.50) nanoparticles and investigate their structure, absorption spectra, temperature-dependent Raman spectroscopy, impedance spectroscopy and magnetic property. Nanoparticles of STNO were prepared by sol-gel method. The particle size is smaller than 30 nm and depends on the Ni-substituted content. The experimental results indicate that the Ni ions have replaced the site of Ti in unit cells. Detailed temperature-dependent Raman studies of the optical phonons in STNO nanoparticles indicate that the mode energies and symmetry of SrTiO₃ have been changed as doping of Ni ions. An abrupt change in Raman spectra suggests a phase transition around 150 K. We also used impedance spectra to discuss the conductivity of STNO in relation to absorption spectroscopy. Furthermore, magnetisation of STNO significantly increases as Ni content increases.

Online publication date: Fri, 21-Jan-2011

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