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

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Djerdj, Igor ; Popović, Jasminka ; Mal, Suraj ; Weller, Tobias ; Nuskol, Marko ; Jagličić, Zvonko ; Skoko, Željko ; Pajić, Damir ; Suchomski, Christian ; Voepel, Pascal ; Marschall, Roland ; Kozlevčar, Bojan ; Smarsly, Bernd M.:
Aqueous Sol–Gel Route toward Selected Quaternary Metal Oxides with Single and Double Perovskite-Type Structure Containing Tellurium.
In: Crystal Growth & Design. Bd. 16 (2016) Heft 5 . - S. 2535-2541.
ISSN 1528-7505
DOI: https://doi.org/10.1021/acs.cgd.5b01558

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Abstract

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 Pm3̅m, with a = 3.9373(2) Å, whereas Ba3Fe2TeO9 crystallizes in the hexagonal crystal system, space group P63/mmc, a = 5.7691(4) Å, and c = 14.208(1) Å. The third studied perovskite Ba2NiTeO6 crystallizes in the trigonal R3̅m space group with a = 5.7974(4) Å and c = 28.599(2) Å. Based on structural characterization results, the obtained single and double perovskite crystallites are nearly in nanometer regime, ranging from 45 to 164 nm, 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.