ISSN:
0044-2313
Keywords:
Cesium Sodium Titanate
;
Rubidium Sodium Titanate
;
Metatitanate
;
Crystal Structure
;
MAPLE
;
CHARDI
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Two New Metatitanates with Five-coordinated Titanium: CsNaTiO3 and RbNaTiO3 [1]The new oxides CsNaTiO3 (I) and RbNaTiO3 (II) are obtained by heating well grounded mixtures of the binary oxides in Ni-tubes as colourless platelike crystals. I: CsO0.56, NaO0.48 and TiO2, Cs:Na:Ti = 1.1:1.1:1.0; 600°C, 61 d as well as CsO0.97, NaO0.48 and Ti2O3, Cs:Na:Ti = 1.5:3.0:1.0; 760°C, 27 d. II: RbO0.52, NaO0.48 and TiO2, Rb:Na:Ti = 1.1:1.1:1.0; 750°C, 14 d as well as RbO0.98, NaO0.48 and Ti2O3, Rb:Na:Ti = 1.5:3.1:1.0; 760°C, 27 d. CsNaTiO3 (orthorhombic, Cmcm) is nearly isostructural with KNaTiO3 [2]; a = 601.4(1) pm, b = 1 120.3(1) pm, c = 563.4(1) pm (Guinier-Simon-Data, Z = 4). RbNaTiO3 (monoclinic, C2/c) is isostructural with KNaTiO3; a = 590.3(1) pm, b = 1 098.4(1) pm, c = 555.1(0) pm, β = 92.15° (Guinier-Simon-Data, Z = 4). Both structures are determined by using four-circle diffractometer data (CsNaTiO3: Siemens AED2, 2 896Io(hkl), MoKα, R = 2.4%, Rw = 2.3%; RbNaTiO3: Philips PW 1 100, 2 743Io(hkl), AgKα, R = 9.9%, Rw = 8.9%; additional data see text).The Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR) and the Charge Distribution in Solids are calculated and discussed.
Notes:
Die neuen Oxide CsNaTiO3 (I) und RbNaTiO3 (II) wurden durch Tempern inniger Gemenge der binären Oxide in Nickelzylindern als farblose plättchenförmige Kristalle erhalten. I: CsO0,56, NaO0,48 und TiO2, Cs:Na:Ti = 1,1:1,1:1,0; 600°C, 61 d sowie CsO0,97, NaO0,48 und Ti2O3, Cs:Na:Ti = 1,5:3,0:1,0; 760°C, 27 d. II: RbO0,52, NaO0,48 und TiO2, Rb:Na:Ti = 1,1:1,1:1,0; 750°C, 14 d sowie RbO0,98, NaO0,48 und Ti2O3, Rb:Na:Ti = 1,5:3,1:1,0; 760°C, 27 d.CsNaTiO3 (orthorhombisch, Cmcm) ist strukturell eng mit KNaTiO3 [2] verwandt; a = 601,4(1) pm, b = 1 120,3(1) pm, c = 563,4(1) pm (Guinier-Simon-Daten, Z = 4). RbNaTiO3 (monklin, C2/c) ist isotyp zu KNaTiO3; a = 590,3(1) pm, b = 1 098,4(1) pm, c = 555,1(0) pm, β = 92,15° (Guinier-Simon-Daten, Z = 4). Die Aufklärung beider Strukturen erfolgte mit Vierkreisdiffraktometerdaten (CsNaTiO3: Siemens AED2, 2 896Io(hkl), MoKα, R = 2,4%, Rw = 2,3%; RbNaTiO3: Philips PW 1 100, 2 743Io(hkl), AgKα, R = 9,9%, Rw = 8,9%; weitere Daten siehe Text).Für beide Verbindungen werden der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinatioszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR) sowie die Ladungsverteilung (CHARDI) berechnet und diskutiert.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19956210902
