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Single Crystals of NaPrTe 2 with LiTiO 2 ‐Type Structure
Author(s) -
Lissner Falk,
Schleid Thomas
Publication year - 2003
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300233
Subject(s) - praseodymium , octahedron , crystallography , telluride , alkali metal , tellurium , materials science , monoclinic crystal system , crystal structure , type (biology) , sodium , chemistry , inorganic chemistry , metallurgy , ecology , organic chemistry , biology
During attempts to synthesize rare‐earth nitride tellurides black and bead‐shaped single crystals of the title compound sodium praseodymium(III) ditelluride (NaPrTe 2 ) were obtained as a by‐product by reacting a mixture of praseodymium, sodium azide (NaN 3 ) and tellurium at 900 °C for seven days in evacuated torch‐sealed silica vessels. NaPrTe 2 crystallizes cubic (space group: Fd3¯m, Z = 16; a = 1285.51(9) pm, V m = 79.96(1) cm 3 /mol, R 1 = 0.028 for 146 unique reflections) and exhibits the Na + and Pr 3+ cations in slightly distorted octahedra of six telluride anions (d(Na—Te) = 325 pm, d(Pr—Te) = 317 pm) each. The main characteristics of this new structure type for alkali‐metal rare‐earth(III) dichalcogenides can be derived from the rock‐salt type structure (NaCl, cubic closest‐packed Te 2— arrangement, all octahedral voids occupied with Na + and Pr 3+ ) with alternating layers consisting of Na + and Pr 3+ cations in a ratio of 3:1 and 1:3, respectively, piled along the [111] direction.