Pregled bibliografske jedinice broj: 1146202
Rational Sol-Gel-Based Synthesis Design and Magnetic and Dielectric Properties Study of Selected Nanocrystalline Double and Triple Perovskites
Rational Sol-Gel-Based Synthesis Design and Magnetic and Dielectric Properties Study of Selected Nanocrystalline Double and Triple Perovskites // International research and practice conference: Nanotechnology and Nanomaterials (NANO-2021) Abtract Book / Authors, Edition (ur.).
Kijev: LLC "Computer Publishing Center, 2021. str. 523-524 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 1146202 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Rational Sol-Gel-Based Synthesis Design and
Magnetic and Dielectric Properties Study of
Selected Nanocrystalline Double and Triple
Perovskites
Autori
Djerdj, Igor ; Bijelić, Jelena ; Tatar, Dalibor ; Hajra, Sugato ; Sahu, Manisha ; Jagličić, Zvonko
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
International research and practice conference: Nanotechnology and Nanomaterials (NANO-2021) Abtract Book
/ Authors, Edition - Kijev : LLC "Computer Publishing Center, 2021, 523-524
ISBN
978-966-97587-3-6
Skup
9th International Conference Nanotechnologies and Nanomaterials (NANO-2021)
Mjesto i datum
Lviv, Ukrajina, 25.08.2021. - 27.08.2021
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
perovskites ; nanocrystalline ; sol-gel ; magnetic ; dielectric
Sažetak
Complex perovskite materials have attracted extensive attention due to their fascinating properties and novel features attributed to the coexistence of ferro/ferri/antiferro-magnetic ground state and semiconductor band gap within the same material. Triple perovskite Sr3Co2WO9 has been successfully synthesized for the first time in the nanocrystalline form with an average crystallite size of 23 nm by means of a modified aqueous citrate sol-gel method. At room temperature, the crystal structure of Sr3Co2WO9 is cubic, space group Fm-3m with lattice parameter a = 7.9073(6) Å. The formation of Sr3Co2WO9 was studied in situ by X-ray diffraction and analysed by the Rietveld analysis. The detected hysteresis loops with non-zero remanent magnetization and rather large coercive field reveal ferrimagnetic ordering with Curie temperature of 144 K. The measured effective magnetic moment of 3B is close to the expected value for rarely observed intermediate spin S = 1.It is found that the compound exhibits the semiconducting properties with the optical band gaps equal to 3.52 eV (indirect) and 3.76 eV (direct), respectively, further confirmed by AC conductivity measurements, which varies between 10−5 and 10−4 Ω−1 cm−1. The Maxwell -Wagner model is employed to describe the frequency dependent dielectric constant. The frequency dependent AC conductivity follows the universal Jonscher’s power law. Double perovskites with Sr2NiMO6 (M = W, Te) structure type have been similarly synthesized. The reaction yielded phase pure nanocrystalline powders of two compounds Sr2NiWO6 (SNWO) and Sr2NiTeO6 (SNTO). According to the Rietveld refinement of powder X-ray diffraction data at room temperature Sr2NiWO6 is tetragonal (I4/m) and Sr2NiTeO6 is monoclinic (C12/m1) with average crystallite sizes if 49 and 77 nm, respectively. Both SNTO and SNWO possess high values of dielectric constants (341 and 308, respectively) with low dielectric loss (0.06 for SNWO) at frequency of 1 kHz. The Nyquist plot of both compounds confirms the non-Debye type of relaxation behavior and the dominance of shorter-range movement of charge carriers. Magnetic studies for both compounds revealed antiferromagnetic behavior with TN being 57 K for SNWO and 35 K for SNTO.
Izvorni jezik
Engleski
Znanstvena područja
Fizika, Kemija
POVEZANOST RADA
Projekti:
HRZZ-IP-2016-06-3115 - Istraživanje složenih multiferoičnih materijala pripravljenih metodama otopinske kemije (SOLFERROMAT) (Đerđ, Igor, HRZZ - 2016-06) ( CroRIS)
Ustanove:
Sveučilište u Osijeku - Odjel za kemiju