Title: SrTi1­xNixO3 nanoparticles: synthesis and characterisation

Authors: Doan Thi Thuy Phuong, Le Van Hong, Nguyen Van Minh

Addresses: Center for Nanoscience and Technology, Hanoi National University of Education (HNUE), 136 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam. ' Laboratory of Magnetism and Superconductivity, Division for Electronic Materials, Institute of Materials Science, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Road, Hanoi, Vietnam. ' Center for Nanoscience and Technology, Hanoi National University of Education, 136 Xuan Thuy Road, Cau Giay, Hanoi 10000, Vietnam

Abstract: We present the synthesis of SrTi1­xNixO3 (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.

Keywords: nickel doping; strontium titanate; nanoparticles; Raman spectroscopy; impedance spectroscopy; magnetisation; nanotechnology; sol-gel; conductivity; perovskites.

DOI: 10.1504/IJNT.2011.038208

International Journal of Nanotechnology, 2011 Vol.8 No.3/4/5, pp.312 - 323

Published online: 21 Jan 2011 *

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