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Higher nitrides of hafnium, zirconium, and titanium synthesized by dual ion beam deposition

Published online by Cambridge University Press:  31 January 2011

B.O. Johansson ,
H.T.G. Hentzell ,
J.M.E. Harper  and
J.J. Cuomo
B.O. Johansson
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
H.T.G. Hentzell
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
J.M.E. Harper
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
J.J. Cuomo
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
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Abstract

We report the preparation and properties of higher nitrides of Hf, Zr, and Ti synthesized by dual ion beam deposition. For Hf and Zr, evidence is given for the existence of a metastable nitride phase with composition of approximately Hf3 N4 and Zr3 N4. These two materials are insulating and transparent straw colored, in contrast to the well-known mononitrides, which are shiny, gold colored, and highly conducting. For Ti-N we do not reach as high an N content and do not obtain an insulating, transparent phase. The higher nitrides of Hf and Zr are synthesized under energetic nitrogen ion bombardment (200 e V) of a growing film and do not form in the presence of molecular nitrogen gas alone. Several variations of the ion beam deposition process are used to obtain a wide range of film composition and to study the transition from the mononitride to the higher nitride phase. Transmission electron diffraction shows the structure of Hf3N4 and Zr3N4 to be very close to the Bl (NaCl) structure of the mononitrides, but with a slight rhombohedral distortion. Additional evidence from noble gas incorporation (Ne, Ar, and Xe) supports a model of these higher nitrides as containing a large number of vacancies on the metal atom sites.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 3 , June 1986 , pp. 442 - 451
Copyright
Copyright © Materials Research Society 1986

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References

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