The crystal structure of sodium metatellurate

Kratochvíl, Bohumil; Jenšovský, L.

doi:10.1107/s0567740877008978

Cited by 26 publications

(20 citation statements)

References 1 publication

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“…These building units are linked through each two edges, in an all "skew" arrangement of the shared edges of the octahedron. A related connection pattern has been previously observed in Na 2 TeO 4 [23]. The resulting one-dimensional isopolyanion, 1 ϱ [TeO 4/2 O 2/1 ] 2Ϫ is extending parallel to the crystallographic b-axis (Fig.…”

Section: Impedance Spectroscopysupporting

confidence: 76%

Ag₄I₂SeO₄ and Ag₃ITeO₄ – Two New Silver Solid Electrolytes

Pitzschke

Čurda

Çakmak

et al. 2008

Zeitschrift anorg allge chemie

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Two new silver solid electrolytes, Ag 4 I 2 SeO 4 and Ag 3 ITeO 4 , have been synthesized by solid state reactions starting from stoichiometric mixtures of Ag 2 O and AgI with SeO 2 , or TeO 2 , respectively, at elevated oxygen pressures. The new materials have been characterized using powder X-ray diffraction, differential scanning calorimetry, ionic conductivity measurements and single crystal structure determination. Both compounds, Ag 4 I 2 SeO 4 and Ag 3 ITeO 4 , show an abrupt increase in the ionic conductivity in the temperature range of 50 to 70°C and 90 to 130°C, respectively. Ag 4 I 2 SeO 4 has a silver ion conductivity of 1.6 ϫ 10 Ϫ3 at 30°C with an activation energy of 0.22 eV, between 30 and 51°C. It crystallizes as green crystals in Pna2 1 with a ϭ 9.3514 (1) Å , b ϭ 1071 13.1552(4) Å , c ϭ 7.0886(4) Å , V ϭ 871.80(6) Å 3 and Z ϭ 4. The crystal structure consists of isolated SeO 4 tetrahedra separated by Ag ϩ and I Ϫ ions. Ag 3 ITeO 4 crystallizes in P2 1 /c with a ϭ 19.6597(2) Å , b ϭ 7.1240(4) Å , c ϭ 13.3598(3) Å , β ϭ 97.795(2)°, V ϭ 1853.83(11) Å 3 and Z ϭ 12. The structure consists of 1 ϱ [TeO 4/2 O 2/1 ] 2Ϫ isopolyanions, extending along the b-axis. The chains are separated by Ag ϩ and I Ϫ ions. Ag 3 ITeO 4 has a silver ion conductivity of 7.4 ϫ 10 Ϫ5 Ω Ϫ1 cm Ϫ1 at 30°C, with an activation energy of 0.27 eV between 25 and 100°C.

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Section: Impedance Spectroscopysupporting

confidence: 76%

Ag₄I₂SeO₄ and Ag₃ITeO₄ – Two New Silver Solid Electrolytes

Pitzschke

Čurda

Çakmak

et al. 2008

Zeitschrift anorg allge chemie

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“…1. It exhibits octahedrally coordinated Te atoms in infinite chains along e, similar to those in Na2TeO 4 (Kratochvil & Jensovsky, 1977).…”

mentioning

confidence: 84%

“…The structures were determined from step-scanned Cu K~ data, obtained on a Philips PW 1100 diffractometer. The coordinates of the Te and Ca atoms of CaTeO 4 were deduced from Patterson maps; the O atoms were placed on positions equivalent to those in Na2TeO 4 (Kratochvil & Jensovsky, 1977 (7) 1.8 (7) 0(2) 0.268 (6) 0.328 (4) 0.644 (4) 1.8 (7) Fig. 1.…”

mentioning

confidence: 99%

Structures of calcium tellurate, CaTeO₄, and strontium tellurate, SrTeO₄

Hottentot¹,

Loopstra²

1979

Acta Crystallogr Sect B

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CaTeO 4, orthorhombic, Pbcn, a = 5.231 (1), b= 12.676 (2), c = 4.977 (1)A, V= 330.0 A3, Z = 4, D e = 4.66 Mg m -3. SrTeO 4, orthorhombic, Pbcn, a = 5.574 (2), b = 13.114 (3), c= 5.001 (1) A, V= 365.6 A 3, z = 4, D c = 5.07 Mg m -3. The structures of the isostructural compounds CaTeO4 and SrTeO 4 were determined from X-ray powder data. They contain strings of Te-O octahedra similar to those in Na2TeO4.

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“…23 Na spectrum for x ¼ 0:5 has a total of 1872% sodium in the second phase suggesting that the composition of this phase is sodium metatellurate Na 2 TeO 4 with Fe 2 O 3 substitution. This is reported to have two sodium sites of equal occupancy and one tellurium site [24]. Using this information, it was possible to identify the minor peaks in the XRD spectrum from x ¼ 0:50 as Na 2 TeO 4 (asterisked peaks in Fig.…”

Section: Article In Pressmentioning

confidence: 99%