The crystal structure of the alums, (NH3CH3)A1(S04)2 • I2H2O and (NHJAlCSOJz • I2H2O, has been determined and refined from X-ray and neutron diffraction data. The Compounds crystallize cubic in space group Pai (Z = 4) with a^ = 12.322(3)Ä and a^ = 12.242(1)Ä respectively. The positional and thermal parameters of all atoms including hydrogens have been refined by füll matrix least-squares analysis resulting in Ry, values from the X-ray and neutron data of 0.030 and 0.029 respectively for the methylammonium alum and of 0.024 and 0.014 respectively for the ammonium alum.The atoms of the cation groups (NHjCHj)^ and (NH4)^ are distributed on 8(c) and 24(
Measurements of the temperature dependence of the ohmic and space‐charge limited (SCL) currents flowing in the C* direction of crystals of β‐zinc phthalocyanine under vacuum enables the deduction of both, depth and concentration of localized levels in this molecular solid. The bulk current in ZnPc crystals is found to exhibit ohmic behaviour up to fields of 5 × 105 Vm−1 and square‐law dependence on voltages beyond this value. A discrete electron level 0.37 eV below the conduction band, with a state density of 3 × 1025 m−3 is observed. The thermal band gap is 1.67 eV.
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