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Twinning and crystal slip in black monoclinic ZnP2

Published online by Cambridge University Press:  03 March 2011

Michael E. Fleet  and
Joseph C. White
Michael E. Fleet
Affiliation:
Department of Geology, University of Western Ontario, London, Ontario N6A 5B7, Canada
Joseph C. White
Affiliation:
Department of Geology, University of New Brunswick, P. O. Box 4400, Fredericton, New Brunswick E3B 5A3, Canada
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Abstract

Monoclinic βZnP2 (black ZnP2) single crystals, synthesized in the presence of excess P, contain regions of polysynthetic lamellar-twinned structure, with dislocations and stacking fault-like features. The twin law is a* twin axis, (100) composition plane: (100) is also the slip plane. The twin composition plane migrates across (100) lattice fringes. In the revised βZnP2 crystal structure, Zn(1) and P(4) positions are related across a (100) twin composition plane at x = 0.84 by two twin operations, with axes through is also a possible slip plane, with three partial dislocations, ½[001], ½[001], and ½[001]. A third possible twin operation relates Zn(2) and P(1) positions across a (100) twin plane at x = 0.5, with twin axis through All twin and slip operations result in very little distortion in nearest- and nextnearest-neighbor coordination geometries. Twin and stacking fault mistakes may be facilitated by approach of the monoclinic cell parameter ratio c[α sin(β — π/2)] to 4 (which yields a pseudo-orthorhombic unit cell) and by Zn1-xP2 nonstoichiometry.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 1 , February 1986 , pp. 187 - 192
Copyright
Copyright © Materials Research Society 1986

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References

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