Chemische Reaktionen in pulverförmigen Gemengen zweier Kristallarten

Thermal and chemical methods for producing zinc silicate (willemite): A review

“…Phase formation of Zn 2 SiO 4 :Mn 2þ and other inorganic phosphors used in solid-state methods proceed by solid-diffusion of atoms or atomic groups among solid raw materials, whose diffusion rates are very low. Tammann reported that ZnO and SiO 2 react at around 775 C to form Zn 2 SiO 4 that is confirmed by the appearance of an exothermic peak with differential scanning calorimetry [161]. Pabst obtained the same temperature value by way of solid-state experiments [162].…”

Synthesis and characterization of M3V2O8 (M = Ca, Sr and Ba) by a solid-state metathesis approach

“…The first report of synthesis of Ca 3 V 2 O 8 was carried out by Tammann in 1925 reacting CaO and V 2 O 5 (Tammann 1925). Grzechnik and McMillan (1997b) synthesized Sr 3 V 2 O 8 and Ba 3 V 2 O 8 by reacting SrCO 3 /BaCO 3 and V 2 O 5 at 1373 K for 72 h. Simner et al (2000) synthesized Sr 3 V 2 O 8 by reacting SrCO 3 and V 2 O 5 at 1423 K for 4 h. Grzechnik and McMillan (1997b) have synthesized Sr 3 V 2 O 8 particles at 1100°C for 72 h. Umemura et al (2006) synthesized barium orthovanadate by calcining the precursors at 700°C for 20 h followed by further sintering at high temperature with sintering aid additives.…”

57Fe Mössbauer spectra from fluorinated phases of Fe0.50M0.50(M = Co,Mg)Sb2O4

“…4.2 K is unusual, being the result of combined magnetic hyperfine and electric quadrupole interactions of comparable strength [8][9][10] and, together with data recorded above T N [11], has been used to determine the order of the t 2g orbital energy levels. The literature also documents some structurally related compounds of composition MSb 2 O 4 (M = Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Mg 2+) [12][13][14][15][16][17].…”