Physical Review B (Condensed Matter) -- February 1, 1997
Volume 55, Issue 6, pp. 3456-3460

Equation of state of alpha -Si[sub 3]N[sub 4]

: M. B. Kruger
: Department of Physics, University of Missouri-Kansas City, Kansas City, Missouri 64110

: J. H. Nguyen
: Department of Physics, University of California, Berkeley, California 94720-4767

: Y. M. Li
: Department of Physics, University of Missouri-Kansas City, Kansas City, Missouri 64110

: W. A. Caldwell
: Department of Geology and Geophysics, University of California, Berkeley, California 94720-4767

: M. H. Manghnani
: School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822

: R. Jeanloz
: Department of Geology and Geophysics, University of California, Berkeley, California 94720-4767

X-ray diffraction at high pressures reveals that alpha -Si[sub 3]N[sub 4] is metastable to at least 48 GPa when compressed statically at 295 K, and yields a zero-pressure bulk modulus of K[sub 0]=228.5 ((plus-minus)4) GPa, assuming a pressure derivative K[sub 0][sup (prime)]=4. The compression is nearly isotropic, but with the c direction being slightly more incompressible than the a direction, in good agreement with theory.

History	Received: 28 June 1996; Revised: 20 September 1996
Subject	Equations of state, phase equilibria, and phase transitions
PACS	CODE: 64.30.+t Equations of state, phase equilibria, and phase transitions : Equations of state of specific substances CODE: 62.50.+p Mechanical and acoustical properties of condensed matter : High-pressure and shock-wave effects in solids and liquids CODE: 61.10.Nz Structure of solids and liquids; crystallography : X-ray diffraction and scattering : [Single-crystal and powder diffraction] YEAR: 1996
Keywords	silicon compounds; nitrogen compounds; equations of state; X-ray diffraction; metastable states; crystal structure; high-pressure effects; synchrotron radiation; least squares approximations
Doc. Type	Experimental
Coden	PRBMDO
PII	S0163-1829(97)04206-9

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