Structural, photocatalytic and electroconductive properties of bismuth-substituted CaMoO4

ABO4 type scheelite phases in (Ca/Sr)MoO4 - BiVO4 - Bi2Mo3O12 systems: synthesis, structure and optical properties

“…But for oxides with higher x values the additional peaks in the XRD patterns are evident. These oxides were found to have the tetragonal supercell with a sup ≈ √5a, c sup ≈ c, where a and c are the tetragonal scheelite cell parameters, like it was found earlier for Ca 1−3x Bi 2x Mo 1 O 4[19] and Sr 1−3x Bi 2x Mo 1 O 4[20]. The areas of solid solutions (ordinary scheelite and superstructured scheelite) and inveatigated fields of triple phase diagram are shown at Fig.1.…”

“…The simultaneous use of mechanisms (2) and (3) have not been described yet. For this reason the present work is devoted to the synthesis and characterization Bi and V co-doped CaMoO 4 are the tetragonal scheelite cell parameters [19]. This superstructural ordering results in the additional reflections on XRPD patterns detected by Guo et al [13] and provided by ordering of Bi atoms and cationic vacancies [19].…”

“…For this reason the present work is devoted to the synthesis and characterization Bi and V co-doped CaMoO 4 are the tetragonal scheelite cell parameters [19]. This superstructural ordering results in the additional reflections on XRPD patterns detected by Guo et al [13] and provided by ordering of Bi atoms and cationic vacancies [19]. Samples described with supercell showed maximal photocatalytic activity due to complex microstructure at grain surface and also showed a decrease of total conductivity as compared to samples with normal scheelite structure [19].…”

Structure and microwave dielectric properties of Bi- and Ge-doped calcium molybdate

“…The compositions of the general formula Ca1-2xBi2xMo1-xGexO4 (0.025  x  0.5) series were synthesized by a conventional solid state method [9,15] from CaCO3 (99.0%, Reakhim), Bi2O3 (99.9%, Merck), GeO2 (99.99%, Lanhit) and MoO3 (99.5%, Reakhim) in the range of 600-900 °C.…”

“…Probably, the decrease in the band gap is provided by additional Bi 6p electrons in the valence band and changing of the conduction band, which includes Mo 4d and Ge 4p electrons. Such a band gap decrease is favourable for the use of these materials as yellow pigments or as photocatalysts, as in the case of the Ca1−3xBi2xФxMoO4 series [15].…”