Preparation, characterization, magnetic susceptibility (Eu, Gd and Sm) and XPS studies of Ln(2)ZrTiO(7) (Ln = La, Eu, Dy and Gd)

作者：Kumar B Vijaya; Velchuri Radha; Devi V Rama; Sreedhar B; Prasad G; Prakash D Jaya; Kanagaraj M; Arumugam S; Vithal M^*

来源：Journal of Solid State Chemistry, 2011, 184(2): 264-272.

DOI：10.1016/j.jssc.2010.11.014

• Sol-gel
• Raman
• Magnetic susceptibility
• XPS

Bulk and nanosized pyrochlore materials Ln(2)ZrTiO(7) (Ln=La, Eu, Dy, Gd and Sm) have been prepared by the sol-gel method. All the samples were characterized by powder X-ray diffraction, Raman and X-ray photoelectron spectroscopy. Magnetic susceptibility (chi) measurements of Gd2ZrTiO7, Sm2ZrTiO7 and Eu2ZrTiO7 were carried out by vibrating sample magnetometer in the temperature range 2-320 K. The variation of chi(-1) (Or chi) with temperature of Gd2ZrTiO7. Sm2ZrTiO7 and Eu2ZrTiO7 follows the Curie law, intermediate formula and the Curie-Weiss law, respectively. From the linear portion of chi T vs. T-1 plot of Eu2ZrTiO7 from 2 to 15 K, the classical nearest neighbor exchange (J(cl)) and dipolar interactions (D-nn) are obtained. The XPS of Ln(2)ZrTiO(7) (Ln= La, Eu, Dy and Gd) gave characteristic peaks for Ln, Ti, Zr and O. The satellite peaks are observed only for 3d La of La2ZrTiO7.

• 出版日期2011-2