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Single-Step Preparation of the Mixed BaII−NbV Oxides from a Heteropolynuclear Oxalate Complex


Jurić, Marijana; Popović, Jasminka; Šantić, Ana; Molčanov, Krešimir; Brničević, Nevenka; Planinić, Pavica
Single-Step Preparation of the Mixed BaII−NbV Oxides from a Heteropolynuclear Oxalate Complex // Inorganic chemistry, 52 (2013), 4; 1832-1842 doi:10.1021/ic301888p (međunarodna recenzija, članak, znanstveni)


Naslov
Single-Step Preparation of the Mixed BaII−NbV Oxides from a Heteropolynuclear Oxalate Complex

Autori
Jurić, Marijana ; Popović, Jasminka ; Šantić, Ana ; Molčanov, Krešimir ; Brničević, Nevenka ; Planinić, Pavica

Izvornik
Inorganic chemistry (0020-1669) 52 (2013), 4; 1832-1842

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

Ključne riječi
Heteropolynuclear oxalate complex; single-step preparation; mixed BaII−NbV oxides

Sažetak
A novel oxalate-based complex of the formula {; ; Ba2(H2O)5[NbO(C2O4)3]HC2O4}; ; ·H2O (1) was prepared from an aqueous solution containing the [NbO(C2O4)3]3− and Ba2+ entities in the molar ratio 1:2, and characterized by X-ray single-crystal diffraction, IR spectroscopy, and thermal analysis. The crystal packing of 1 reveals a complex three-dimensional (3D) network: the Nb polyhedron is connected to eight neighboring Ba polyhedra through the oxalate ligands and the oxo- oxygen group, whereas the Ba polyhedra share edges and vertices. The ability of compound 1 to act as a single-source precursor for the formation of bimetallic oxides was investigated by the thermal analysis (TGA and DSC) and X-ray powder diffraction. Thermal processing of 1 resulted in the formation of mixed-metal oxide phases, Ba4Nb2O9 and Ba5Nb4O15. Three stable polymorphs of Ba4Nb2O9 were isolated: the known, hexagonal α- and orthorhombic γ-Ba4Nb2O9, and another one, not previously reported, hexagonal δ-Ba4Nb2O9 polymorph. The new, δ-Ba4Nb2O9 polymorph has the 6H-perovskite structure (space group P63/m), in which the Nb2O98− face-sharing octahedral dimers are interconnected via corners to the regular BaO610− octahedra. Formation of the mixed-metal oxides takes place at different temperatures: the Ba5Nb4O15 oxide occurred at ∼700 °C, as the major crystalline oxide phase ; by heating the sample up to 1135 °C, the α-Ba4Nb2O9 form was obtained, whereas the heating at 1175 °C caused the crystallization of two polymorphs, γ-Ba4Nb2O9 and δ-Ba4Nb2O9. Special focus was set on the electrical properties of the prepared mixed BaII−NbV oxides obtained by this molecular pathway in a singlestep preparation.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
098-0982904-2946 - Višenuklearni metalni sustavi: sinteza i svojstva (Berislav Perić, )
098-0982929-2916 - Utjecaj strukture na električna svojstva (bioaktivnih) stakala i keramike (Andrea Moguš-Milanković, )
098-1191344-2943 - Protein-ligand međudjelovanja na atomnoj razini (Marija Luić, )

Ustanove
Institut "Ruđer Bošković", 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
  • MEDLINE


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