M.Albino et al. Supporting Information EurJIC2013

Materials Science and Engineering: A, 1992

International Journal of Hydrogen Energy, 2012

Proton conductivity Phase purity Solid solubility a b s t r a c t The effect of cation non-stoichiometry in LaNbO 4 was investigated by impregnating nanocrystalline LaNbO 4 with small amounts of La 3þ , Nb 5þ and Ca 2þ oxide precursors. The sintering properties of the modified LaNbO 4 powders were investigated by dilatometry, and the microstructure and phase composition were studied by electron microscopy and X-ray diffraction. The electrical properties of the materials were studied by 4-point DC-conductivity and 2-point 4-wire AC-conductivity at elevated temperatures in controlled atmosphere. Minor variations in the cation stoichiometry were shown to have a pronounced effect on both the sintering properties as well as the electrical conductivity. Addition of CaO, which introduced secondary phases above 0.25 mol% CaO, increased the sintering temperature and improved the conductivity of the materials. La 2 O 3 -and Nb 2 O 5 -excess materials did not show large variation in the electrical conductivity relative to pure LaNbO 4 , while the sintering properties were strongly affected by the nominal La/Nb ratio in LaNbO 4 . The present findings demonstrate the sensitivity of cation non-stoichiometry in materials with limited solid solubility.

Zeitschrift für Kristallographie - New Crystal Structures, 2002

Phase equilibrium in the CeBr 3 -RbBr binary system was established from differential scanning calorimetry (DSC). This system has three compounds Rb 3 CeBr 6 , Rb 2 CeBr 5 and RbCe 2 Br 7 and two eutectics located at (x = 0.141; 858 K) and (x = 0.528; 762 K), respectively. Rb 3 CeBr 6 forms at 614 K, undergoes a solid-solid phase transition at 695 K and melts congruently at 966 K. Rb 2 CeBr 5 melts incongruently at 830 K and RbCe 2 Br 7 at 741 K. The electrical conductivity of CeBr 3 -RbBr liquid mixtures was measured down to temperatures below solidification over the whole composition range. Results obtained are discussed in term of possible complex formation. (M. Gaune-Escard). gram topology of LnCl 3 -MCl, LnBr 3 -MBr and LnI 3 -MI binary systems. All these systems can be divided into three groups [3]:

5 Methyl 4,5 dihydro 3H spiro[benzo 2 azepine 3,1´ cyclohexane] N oxide was rear ranged into 5 methyl 1 oxo 1,2,4,5 tetrahydro 3H spiro[benzo 2 azepine 3,1´ cyclohexane]. The latter was used for the synthesis of spiro{triazolo[3,4 a] and tetrazolo[5,1 a]benzo 2 azepinecyclohexanes}. Key words: spiro[benzo 2 azepinecyclohexanes], spiro{azolo[5,1 a]benzo 2 azepine cyclohexanes}, rearrangements, cyclic nitrones, fused triazoles, fused tetrazoles. 1.36 (d, 7.24-7.67 0.80-1.65 5.95 (br.s, NH) J = 11.6, J = 5.8, J = 7.0, J = 5.8, J = 7.0) J = 13.7) J = 13.7) J = 11.6) 3 1.73 (dd, 2.12 (dd, 2.97 (qdd, 1.37 (d, 7.18-7.88 0.70-1.80 8.23 (br.s, NH) J = 11.9, J = 5.8, J = 6.7, J = 5.8, J = 6.7) J = 13.7) J = 13.7) J = 11.9) 4 1.64 (m) 2.22 (m) 3.81 (m) 1.38 (d, 7.20-7.70 0.85-1.95 -J = 6.8) 5 1.74 (dd, 2.15 (dd, 2.93 (qdd, 1.27 (d, 7.15-7.40 0.65-2.00 2.45 (s, MeS) J = 11.9, J = 5.5, J = 6.7, J = 5.5, J = 6.7) J = 13.7) J = 13.7) J = 11.9) 6 2.12 (dd, 2.28 (dd, 3.11 (qdd, 1.40 (d, 7.25-7.60; 0.80-1.80 -J = 11.3, J = 5.5, J = 7.0, J = 5.5, J = 7.0) 7.95 (1 H) J = 14.0) J = 14.0) J = 11.3) 7 1.80 (dd, 2.19 (dd, 3.10 (qdd, 1.39 (d, 7.35-7.65 1.10-1.80 7.96 (BB´, J = 11.9, J = 5.5, J = 6.7, J = 5.5, J = 6.7) 3 pyridyl); J = 13.7) J = 13.7) J = 11.9) 8.66 (AA´, 2 pyridyl) 8 2.15 (dd, 2.35 (dd, 3.10 (qdd, 1.42 (d, 7.25-7.60; 0.50-1.80 7.90 (BB´, J = 11.3, J = 5.4, J = 7.0, J = 5.4, J = 7.0) 8.10 (1 H) 3 pyridyl); J = 14.2) J = 14.2) J = 11.3) 8.63 (AA´, 2 pyridyl) 9 1.86 (dd, 2.15 (dd, 3.38 (qdd, 1.39 (d, 7.23-7.64 1.00-1.80 3.96 (s, MeO) J = 11.6, J = 5.5, J = 6.7, J = 5.5, J = 6.7) J = 13.7) J = 13.7) J = 11.6) 10 1.98 (dd, 2.53 (dd, 2.96 (qdd, 1.44 (d, 7.30-7.55; 1.80-2.20; 2.28 (s, MeCO) J = 9.