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Phase Transformations of Lithium Nitride under Pressure

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Citation

Beister, H. J., Haag, S., Kniep, R., Strössner, K., & Syassen, K. (1988). Phase Transformations of Lithium Nitride under Pressure. Angewandte Chemie International Edition, 27(8), 1101-1103. doi:10.1002/anie.198811011.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-B63B-F
Abstract
The transformation of α-Li3N to β-Li3N occurs at 600 MPa and room temperature. The reverse transformation, however, only begins to take place above 200°C under normal pressure. β-Li3N crystallizes as the Na3As structure type. This modification allows Li3N to be placed systematically in the structural series of alkali-metal compounds A3B 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-Li3N upon grinding with a mortar and pestle cannot be ruled out. Indeed, X-ray powder diffractions of α-Li3N always reveal the presence of small amounts of β-Li3N.