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Modified aqueous sol-gel route towards quaternary metal oxides containing tungsten

In modern times of technology development there is a need for reducing size and expanding density of data storage components. Ferroelectricity and ferromagnetism are essential for achieving multifunctional properties. Complex metal oxides with double perovskite type crystal structure Sr3Fe2WO9 and Ba3Fe2WO9 have been synthesized using modified citrate sol-gel route. Dried samples were calcined at 600 °C and 950 °C in furnace with air flow and at a temperature rate of 2 °C per minute. Calcined samples were characterized by Powder X-ray diffraction (PXRD), Energy- dispersive X-ray spectroscopy (EDS), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) while magnetic ground state has been determined using SQUID measurement. At room temperature, the crystal structure of Sr3Fe2WO9 is cubic, space group Pm-3m (221) with a = 3.9440 Å, whereas Ba3Fe2WO9 crystallizes in hexagonal crystal system with space group P63/mmc (194), a = 5.7593 Å and c = 14.1096 Å. Obtained results have revealed that synthesized materials are 96 wt. % pure and their average crystallite size has remained in nanometer range ranging from 15 to 27 nm despite the high calcination temperatures. Magnetic measurements have revealed that these materials possess ferrimagnetic properties.

perovskite structure ; sol-gel, ferroics ; multiferroics ; citrate route

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