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The New High‐Pressure Sodium Tetraborate HP‐Na 2 B 4 O 7
Author(s) -
Neumair Stephanie C.,
Sohr Gerhard,
Vanicek Stefan,
Wurst Klaus,
Kaindl Reinhard,
Huppertz Hubert
Publication year - 2012
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.201100363
Subject(s) - trigonal crystal system , crystallography , sodium , crystal structure , high pressure , chemistry , structure type , materials science , analytical chemistry (journal) , physics , thermodynamics , metallurgy , chromatography
The new polymorph of sodium tetraborate HP‐Na 2 B 4 O 7 was synthesized under high‐pressure / high‐temperature conditions of 6 GPa and 1000 °C in a multianvil apparatus with a Walker‐type module. HP‐Na 2 B 4 O 7 crystallizes with nine formula units per cell in the trigonal chiral space groups P 3 2 21 or P 3 1 21 . The parameters are a = 765.5(2), c = 2142.3(4) pm, V = 1.0872(3) nm 3 , R 1 = 0.0581, and wR 2 = 0.0809 (all data). The crystal structure of HP‐Na 2 B 4 O 7 is built up from interconnected “sechser” rings of alternating corner‐sharing BO 3 and BO 4 groups.