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Phase Transformations of Lithium Nitride under Pressure
Author(s) -
Beister Heinz Jürgen,
Haag Sabine,
Kniep Rüdiger,
Strössner Klaus,
Syassen Karl
Publication year - 1988
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198811011
Subject(s) - lithium (medication) , alkali metal , nitride , phase (matter) , chemistry , crystallography , nitrogen , metal , inorganic chemistry , grinding , materials science , metallurgy , organic chemistry , medicine , layer (electronics) , endocrinology
The transformation of α‐Li 3 N to β‐Li 3 N occurs at 600 MPa and room temperature. The reverse transformation, however, only begins to take place above 200°C under normal pressure. β‐Li 3 N crystallizes as the Na 3 As structure type. This modification allows Li 3 N to be placed systematically in the structural series of alkali‐metal compounds A 3 B involving elements of the nitrogen group (A = Li, Na, K, Rb, Cs; B = N, P, As, Sb, Bi). Since the phase transition occurs at relatively low pressure, the formation of small amounts of β‐Li 3 N upon grinding with a mortar and pestle cannot be ruled out. Indeed, X‐ray powder diffractions of α‐Li 3 N always reveal the presence of small amounts of β‐Li 3 N.