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Pregled bibliografske jedinice broj: 1002340

Single‐step preparation of rutile‐type CrNbO4 and CrTaO4 oxides from oxalate precursors–characterization and properties


Androš Dubraja, Lidija; Pajić, Damir; Vrankić, Martina; Dragović, Jure; Valant, Matjaz; Benčina, Metka; Jurić, Marijana
Single‐step preparation of rutile‐type CrNbO4 and CrTaO4 oxides from oxalate precursors–characterization and properties // Journal of the American Ceramic Society (2019) (znanstveni, prihvaćen)


Naslov
Single‐step preparation of rutile‐type CrNbO4 and CrTaO4 oxides from oxalate precursors–characterization and properties

Autori
Androš Dubraja, Lidija ; Pajić, Damir ; Vrankić, Martina ; Dragović, Jure ; Valant, Matjaz ; Benčina, Metka ; Jurić, Marijana

Vrsta, podvrsta
Radovi u časopisima, znanstveni

Izvornik
Journal of the American Ceramic Society (2019)

Status rada
Prihvaćen

Ključne riječi
Band gap ; decomposition ; magnetic materials/properties ; scanning electron microscopy ; X‐ray methods

Sažetak
Chromium niobate and tantalate (CrNbO4 and CrTaO4) were synthesized by pyrolysis of the oxalate‐based heterometallic complexes [Cr2(bpy)4(μ-O)4Nb2(C2O4)4]·3H 2O (Cr‐Nb) and [Cr(bpy)2(H2O)(μ‐O)Ta(C2O4)3]2·3.5H2O (Cr‐Ta) (bpy = 2, 2'‐bipyridine). Compared to conventional solid‐state synthesis, herein studied oxides are prepared at lower temperatures, in one step without repeating grinding procedures. The structure, morphology, and optical properties of the as‐synthesized oxides were characterized using powder X‐ray diffraction (PXRD), field emission scanning electron microscopy (SEM), the thermogravimetric and differential thermal analysis (TG/DTA) and UV‐vis diffuse reflectance spectroscopy (UV‐vis DRS). The determined band gap energies of CrNbO4 and CrTaO4 are 2.39 and 2.82 eV, respectively, which prompted us to investigate photocatalytic activity of these oxides in degradation of dyes. Microscopy studies show that the particles of both oxides began to aggregate into bigger particles, leading to an increase in grain size. Additionally, magnetization measurements on both oxides revealed spin‐glass behavior at low temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2014-09-4079 - Novi metal-organsi sustavi s oksalatnim i kinoidnim ligandima s podešenim svojstvima pogodnim za primjenu (Krešimir Molčanov, )
HRZZ-UIP-2014-09-8276 - Multiferični i magnetoelektrični sustavi (Damir Pajić, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus