TY - JOUR
T1 - A potassium tantalum(V) tetrasilicate KTaSi2O7
AU - Lee, Jong Gyu
AU - Höhn, Peter
AU - Greenblatt, Martha
N1 - Funding Information:
The authors thank Dr. Tom Emge for the data collection and Mr. J. Yan for the ionic conductivity measurement. We thank Professor W. H. McCarroll for critically reading the manuscript. This work was supported by NSF Solid State Chemistry Grants DMR-91-19301 and DMR-93-14605.
PY - 1996/4
Y1 - 1996/4
N2 - The crystal structure of a new potassium tantalum(V) cyclotetrasilicate, KTaSi2O7 (K2Ta2Si4O14), has been determined by single crystal X-ray diffraction. KTaSi2O7 crystallizes in the tetragonal system, space group P4/mbm with a = 8.735(2) and c = 7.999(2) Å, V = 610.3(2) Å3, Z = 4, dx = 4.225 g/cm3, λ (MoKα) = 0.71073 Å, μ = 190.7 cm-1, F′ (000) = 704, T = 293 K, R = 0.0421, Rw = 0.0789 for 451 unique reflections (Rint = 0.0227) with F20 > 0. The framework structure of KTaSi2O7 is built up from chains of corner-sharing TaO6 octahedra running parallel to the fourfold axes and linked together by four-membered Si4O12 single units. AC impedance measurements on KTaSi2O7 indicate low ionic conductivities, 5.6 × 10-9 and 3.0 × 10-7 Ω · cm-1 at 333 and 546°C, respectively. An activation energy of 0.83 ± 0.02 eV is observed.
AB - The crystal structure of a new potassium tantalum(V) cyclotetrasilicate, KTaSi2O7 (K2Ta2Si4O14), has been determined by single crystal X-ray diffraction. KTaSi2O7 crystallizes in the tetragonal system, space group P4/mbm with a = 8.735(2) and c = 7.999(2) Å, V = 610.3(2) Å3, Z = 4, dx = 4.225 g/cm3, λ (MoKα) = 0.71073 Å, μ = 190.7 cm-1, F′ (000) = 704, T = 293 K, R = 0.0421, Rw = 0.0789 for 451 unique reflections (Rint = 0.0227) with F20 > 0. The framework structure of KTaSi2O7 is built up from chains of corner-sharing TaO6 octahedra running parallel to the fourfold axes and linked together by four-membered Si4O12 single units. AC impedance measurements on KTaSi2O7 indicate low ionic conductivities, 5.6 × 10-9 and 3.0 × 10-7 Ω · cm-1 at 333 and 546°C, respectively. An activation energy of 0.83 ± 0.02 eV is observed.
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U2 - 10.1006/jssc.1996.0160
DO - 10.1006/jssc.1996.0160
M3 - Article
AN - SCOPUS:16144368700
SN - 0022-4596
VL - 123
SP - 123
EP - 128
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 1
ER -