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Title: A potassium tantalum(V) tetrasilicate KTaSi{sub 2}O{sub 7}

Abstract

The crystal structure of a new potassium tantalum(V) cyclotetrasilicate, KTaSi{sub 2}O{sub 2} (K{sub 2}Ta{sub 2}Si{sub 4}O{sub 14}), has been determined by single crystal X-ray diffraction. KTaSi{sub 2}O{sub 7} crystallizes in the tetragonal system, space group P4/mbm with {alpha} = 8.735(2) and c= 7.999(2) {Angstrom}, V= 610.3(2) {Angstrom}{sup 3}, Z = 4, d{sub x} = 4.225 g/cm{sup 3}, {lambda} (MoK{alpha}) = 0.71073 {Angstrom}, {mu} = 190.7 cm{sup {minus}1}, F{sup {prime}} (000) = 704, T = 293 K, R = 0.0421, R{sub w} = 0.0789 for 451 unique reflections (R{sub int} = 0.0227) with F{sub O}{sup 2} > O. The framework structure of KTaSi{sub 2}O{sub 7} is built up from chains of corner-sharing TaO{sub 6} octahedra running parallel to the fourfold axes and linked together by four-membered Si{sub 4}O{sub 12} single units. AC impedance measurements on KTaSi{sub 2}O{sub 7} indicate low ionic conductivities, 5.6 x 10{sup {minus}9} and 3.0 x 10{sup {minus}7} {Omega} {center_dot} cm{sup {minus}1} at 333 and 546{degrees}C, respectively. An activation energy of 0.83 {plus_minus} 0.02 eV is observed.

Authors:
; ;  [1]
  1. State Univ. of New Jersey, NJ (United States)
Publication Date:
OSTI Identifier:
274260
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 123; Journal Issue: 1; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TANTALUM COMPOUNDS; CRYSTAL STRUCTURE; SILICATES; POTASSIUM COMPOUNDS; TETRAGONAL LATTICES; ACTIVATION ENERGY; ELECTRIC IMPEDANCE; IONIC CONDUCTIVITY

Citation Formats

Lee, Jong-Gyu, Hoehn, P, and Greenblatt, M. A potassium tantalum(V) tetrasilicate KTaSi{sub 2}O{sub 7}. United States: N. p., 1996. Web. doi:10.1006/jssc.1996.0160.
Lee, Jong-Gyu, Hoehn, P, & Greenblatt, M. A potassium tantalum(V) tetrasilicate KTaSi{sub 2}O{sub 7}. United States. doi:10.1006/jssc.1996.0160.
Lee, Jong-Gyu, Hoehn, P, and Greenblatt, M. Mon . "A potassium tantalum(V) tetrasilicate KTaSi{sub 2}O{sub 7}". United States. doi:10.1006/jssc.1996.0160.
@article{osti_274260,
title = {A potassium tantalum(V) tetrasilicate KTaSi{sub 2}O{sub 7}},
author = {Lee, Jong-Gyu and Hoehn, P and Greenblatt, M},
abstractNote = {The crystal structure of a new potassium tantalum(V) cyclotetrasilicate, KTaSi{sub 2}O{sub 2} (K{sub 2}Ta{sub 2}Si{sub 4}O{sub 14}), has been determined by single crystal X-ray diffraction. KTaSi{sub 2}O{sub 7} crystallizes in the tetragonal system, space group P4/mbm with {alpha} = 8.735(2) and c= 7.999(2) {Angstrom}, V= 610.3(2) {Angstrom}{sup 3}, Z = 4, d{sub x} = 4.225 g/cm{sup 3}, {lambda} (MoK{alpha}) = 0.71073 {Angstrom}, {mu} = 190.7 cm{sup {minus}1}, F{sup {prime}} (000) = 704, T = 293 K, R = 0.0421, R{sub w} = 0.0789 for 451 unique reflections (R{sub int} = 0.0227) with F{sub O}{sup 2} > O. The framework structure of KTaSi{sub 2}O{sub 7} is built up from chains of corner-sharing TaO{sub 6} octahedra running parallel to the fourfold axes and linked together by four-membered Si{sub 4}O{sub 12} single units. AC impedance measurements on KTaSi{sub 2}O{sub 7} indicate low ionic conductivities, 5.6 x 10{sup {minus}9} and 3.0 x 10{sup {minus}7} {Omega} {center_dot} cm{sup {minus}1} at 333 and 546{degrees}C, respectively. An activation energy of 0.83 {plus_minus} 0.02 eV is observed.},
doi = {10.1006/jssc.1996.0160},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 123,
place = {United States},
year = {1996},
month = {4}
}