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Pregled bibliografske jedinice broj: 703254

Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations


Vrankić, Martina; Žagar, Kristina; Bijelić, Mirjana; Popović, Jasminka; Gržeta, Biserka; Kurajica, Stanislav
Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations // Journal of physics and chemistry of solids, 75 (2014), 11; 1240-1244 doi:10.1016/j.jpcs.2014.06.006 (međunarodna recenzija, članak, znanstveni)


Naslov
Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations

Autori
Vrankić, Martina ; Žagar, Kristina ; Bijelić, Mirjana ; Popović, Jasminka ; Gržeta, Biserka ; Kurajica, Stanislav

Izvornik
Journal of physics and chemistry of solids (0022-3697) 75 (2014), 11; 1240-1244

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

Ključne riječi
Inorganic compounds; sol-gel growth; X-ray diffraction; Electron microscopy; Microstructure

Sažetak
Powder ZnAl2O4 (gahnite) samples doped with 0, 4.3, 7.6 and 11.7 at.% Mn (in relation to Zn) were prepared by a sol-gel technique followed by thermal treatment. The effect of manganese doping on microstructure of the samples has been investigated by transmission electron microscopy and X-ray diffraction. Diffraction patterns showed that all samples were cubic with a spinel structure, space group Fd m. Diffraction lines were broadened indicating on nanocrystalline samples. Transmission electron microscopy investigations confirmed that the samples were nanocrystalline. Particles (grains) in the samples, as observed by transmission electron microscopy were evenly shaped and grain size distribution could be fitted to a lognormal function. Grain sizes determined by TEM analysis and crystallite sizes obtained from diffraction line-broadening analysis were similar. Both decreased with increasing manganese doping level. Increase in doping level from 0 to 11.7 at.% Mn caused the change in grain size from 25.0(7) nm to 14.2(3) nm and the change in crystallite size from 24.1(1) nm to 18.0(1) nm. Doping Mn2+ cations acted as defects in the gahnite structure that increased lattice strain from 0.07(1)% for undoped sample to 0.21% for sample doped with 11.7 at.% Mn, and disturbed crystallites to grow.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Kemijsko inženjerstvo



POVEZANOST RADA


Projekt / tema
098-0982886-2893 - Dopirani optoelektronički i keramički nanomaterijali (Biserka Gržeta, )
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Antun Tonejc, )
125-1252970-2981 - Keramički nanokompoziti dobiveni sol-gel postupkom (Stanislav Kurajica, )

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