Aqueous Sol-Gel Route toward Selected Quaternary Metal Oxides with Single and Double Perovskite-Type Structure Containing Tellurium

作者：Djerdj Igor^*; Popovic Jasminka; Mal Suraj; Weller Tobias; Nuskol Marko; Jaglicic Zvonko; Skoko Zeljko; Pajic Damir; Suchomski Christian; Voepel Pascal; Marschall Roland; Kozlevcar Bojan; Smarsly Bernd M^*

来源：Crystal Growth & Design, 2016, 16(5): 2535-2541.

DOI：10.1021/acs.cgd.5b01558

Highly crystalline SrFe2/3Te1/3O3, Ba3Fe2TeO9, and Ba2NiTeO6 have been synthesized by using a specially developed sol gel route methodology, reducing the time needed employing solid-state routes and resulting in high reaction yield up to 75%. These materials have been studied by X-ray powder diffraction (XRPD), scanning and transmission electron microscopy, Raman spectroscopy, and dielectric and magnetic measurements. At room temperature, the crystal structure of SrFe2/3Te1/3O3 is cubic, space group Pm (3) over barm, with a = 3.9373(2) angstrom, whereas Ba3Fe2TeO9 crystallizes in the hexagonal crystal system, space group P6(3)/mmc, a = 5.7691(4) angstrom, and c = 14.208(1) A. The third studied perovskite Ba2NiTeO6 crystallizes in the trigonal R (3) over barm space group with a = 5.7974(4) angstrom and c = 28.599(2) angstrom. Based on structural characterization results, the obtained single and double perovskite crystallites are nearly in nanometer regime, ranging from 45 to 164 mu, building micrometer-sized particles with visible well-faceted hexagonal morphology. Magnetic measurements show the onset of ferrimagnetic ordering at relatively high temperature of 667 K for the SrFe2/3Te1/3O3, whereas Ba3Fe2TeO9 and Ba2NiTeO6 show antiferromagnetic ordering below 80 and 8.6 K, respectively. The measured room temperature dielectric constants are in the range between 15 and 77.

• 出版日期2016-5