Naslov
Aqueous sol-gel route toward selected quaternary metal oxides with single and double perovskite-type structure containing tellurium

Autori
Đerđ, 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.

Izvornik
Crystal growth & design (1528-7483) 16 (2016), 5; 2535-2541

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
perovskites ; tellurates ; structure ; ferrimagnetism

Sažetak
Highly crystalline SrFe2/3Te1/3O3, Ba3Fe2TeO9 and Ba2NiTeO6 have been synthesized by using a specially developed sol-gel route methodology, reducing the time needed using 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, dielectric and magnetic measurements. At room temperature, the crystal structure of SrFe2/3Te1/3O3 is cubic, space group Pm-3m, 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 trigonal R-3m 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA