Rare Earth Carbodiimide Silicates: RE2(CN2)(SiO4)

Hans-Juergen Meyer

Rare earth carbodiimide silicates RE2(CN2)(SiO4) with RE = Y, La, and Pr where synthesized via solid state metathesis reactions of RECl3, Li2(CN2), and SiO2 or Li2SiO4, respectively, in silica tubes at 550 °C. All three compounds crystallize with different structures, although all of them represent distorted derivatives of the sodium chloride type structure. The structure of Y2(CN2)(SiO4) was refined monoclinically (C2/m, Z = 2, a = 1301.382(5) pm, b = 377.630(1) pm, c = 527.656(2) pm, β = 93.9816(2) °) from X-ray powder data. The crystal structure of La2(CN2)(SiO4) was refined in a different monoclinic space group (P21/c, Z = 4, a = 660.3(1) pm, b = 1282.01(2) pm, c = 656.2(1) pm, β = 105.23(2) °), and the structure of Pr2(CN2)(SiO4) was refined triclinically (P'1, Z = 2, a = 646.7(2) pm, b = 669.2(2) pm, c = 671.8(2) pm,  = 86.18(3) °, β = 73.22(3) °,  = 74.08(3) °) from X-ray single crystal data.

Mots clés: Physical Sciences

Hans-Juergen Meyer. Rare Earth Carbodiimide Silicates: RE2(CN2)(SiO4). Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, ⟨10.1002/zaac.201000013⟩. ⟨hal-00599849⟩