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Structural Phase Transition in Li 2 C 2
Author(s) -
Ruschewitz Uwe,
Pöttgen Rainer
Publication year - 1999
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/(sici)1521-3749(199910)625:10<1599::aid-zaac1599>3.0.co;2-j
Subject(s) - crystallography , crystallite , lithium (medication) , materials science , chemistry , crystal structure , phase transition , phase (matter) , physics , condensed matter physics , organic chemistry , medicine , endocrinology
Pure polycrystalline Li 2 C 2 could be obtained by the reaction of lithium and graphite flakes in an arc‐melting furnace. X‐ray powder investigations on these samples confirm the crystal structure given by Juza , Wehle , and Schuster (Immm, No. 71, Z = 2) which is isotypic to Rb 2 O 2 and Cs 2 O 2 . At about 500 °C a reversible phase transition (1 st order) to a cubic modification (Fm 3 m, No. 225, Z = 4) has been observed. This high temperature modification can be described as an antifluorite‐structure with disordered C 2 2– dumbbells.