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Pregled bibliografske jedinice broj: 498830

Evolution of structural and optical properties in the course of thermal evolution of sol–gel derived cobalt-doped gahnite


Kurajica, Stanislav; Tkalčec, Emilija; Gržeta, Biserka; Iveković, Damir; Mandić, Vilko; Popović, Jasminka; Kranželić, Dajana
Evolution of structural and optical properties in the course of thermal evolution of sol–gel derived cobalt-doped gahnite // Journal of alloys and compounds, 509 (2011), 7; 3223-3228 doi:10.1016/j.jallcom.2010.12.099 (međunarodna recenzija, članak, znanstveni)


Naslov
Evolution of structural and optical properties in the course of thermal evolution of sol–gel derived cobalt-doped gahnite

Autori
Kurajica, Stanislav ; Tkalčec, Emilija ; Gržeta, Biserka ; Iveković, Damir ; Mandić, Vilko ; Popović, Jasminka ; Kranželić, Dajana

Izvornik
Journal of alloys and compounds (0925-8388) 509 (2011), 7; 3223-3228

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

Ključne riječi
Transition metals compounds; sol–gel process; optical properties; light absorption and reflection

Sažetak
Thermal evolution of sol–gel derived gahnite (ZnAl2O4) with 4, 8 and 12 at.% of Zn replaced with Co was studied by thermal analysis techniques (DTA/TGA), X-ray diffraction (XRD) and V–vis diffuse reflectance spectroscopy (DRS). Zinc–cobalt spinel powders were produced by gel heat treatment at temperatures as low as 400 ◦C. Crystal structure was characterized using Rietveld refinement of X-ray diffraction patterns for the samples annealed at 800 ◦C, simultaneously with the analysis of diffraction line broadening. It was found out that the distribution of Co2+ ions in tetrahedral and octahedral sites of zinc cobalt aluminate crystal lattice, crystallite size and lattice strain depend on Co loading. The green color of samples thermally treated at T < 800 ◦C has been explained as a consequence of partial oxidation of Co2+ ions at lower temperatures and accommodation of Co3+ ions in octahedral sites. Thermal treatment at higher temperatures promote gradual change of color from green to blue, characteristic for tetrahedrally coordinated Co2+ ions. The spectra evolution could be interpreted as a progressive reduction of Co3+ to Co2+ ions at higher temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo



POVEZANOST RADA


Projekt / tema
098-0982886-2893 - Dopirani optoelektronički i keramički nanomaterijali (Biserka Gržeta, )
125-1252970-2981 - Keramički nanokompoziti dobiveni sol-gel postupkom (Stanislav Kurajica, )

Ustanove
Prehrambeno-biotehnološki fakultet, Zagreb,
Institut "Ruđer Bošković", Zagreb,
Fakultet kemijskog inženjerstva i tehnologije, 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


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