Synthesis of a new series of compounds RE2Co2/3Nb4/3O7 and stability field diagram of RE2B2/3′B4/3″O7 pyrochlore compounds

New pyrochlore-type oxides in Ca–R–Ti–Nb–O system (R=Y, Sm or Gd)—structure, FT-IR spectra and dielectric properties

“…It is likely that by the above type of reasoning, the first absorption band is due to the Nb -O and the second due to the Ti-O stretching vibration in NbO 6 and TiO 6 octahedron of the pyrochlore. This is reminiscent of results reported earlier [21]. It can be concluded from the above absorption bands that the phase formed is pyrochlore and A -O and B -O stretching frequency is shifted slightly to lower region with the increase in mass of the rare earth cation.…”

[Bmim][TfO] ionic liquid-assisted oriented growth of Co3O4 nanoworms

“…It has many functional applications, including heterogeneous catalysts [4], solid-state sensors [5], electrochromic devices [6], solar energy absorbers [7], electrode materials in Li-ion rechargeable batteries and magnetic materials [8,9]. Various strategies have been developed for the synthesis of Co 3 O 4 nanoparticles viz., thermal decomposition of cobalt precursors under oxidizing environment (210-815 8C) [10][11][12][13], chemical spray pyrolysis (350-400 8C) and chemical vapor deposition (550 8C) [14][15][16]. Nevertheless, all of these methods require relatively high reaction temperature and therefore inconvenient for the bulk production of Co 3 O 4 nanoparticles [17].…”

Solid-state thermal decomposition of the [Co(NH3)5CO3]NO3·0.5H2O complex: A simple, rapid and low-temperature synthetic route to Co3O4 nanoparticles

“…In this context, spinel-type Co 3 O 4 with different morphologies, such as nanoparticles, hollow nanospheres, nanofibres, nanowires, nanowalls, nanorods, nanotubes, nanoboxes, nanocubes and mesoporous structures, have been described in the literature [18][19][20][21][22][23][24]. Among these structures, the preparation of Co 3 O 4 nanoparticles has been extensively studied using physical and chemical techniques such as sol-gel method [25], solvothermal method [26,27], combustion method [28], microemulsion [29], chemical spray pyrolysis [30], chemical vapour deposition [31,32], thermal decomposition of cobalt precursors [33][34][35][36][37][38], ionic liquid-assisted method [39], yeast-assisted biotemplating technique [40], sonochemical method [41], co-precipitation [42], microwave-assisted route [43,44] and mechanochemical method [45]. However, most of these methods utilize toxic and expensive reagents, high temperatures, expensive, complex instruments and long reaction times.…”