0000000000132653
AUTHOR
H. Klee
X-ray-diffraction study of the crystal structures and orientational glass state ofAr1−x(N2)xsolid solutions
Solid solutions of ${\mathrm{Ar}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{N}}_{2}$${)}_{\mathit{x}}$ have been investigated by x-ray powder diffraction in the range 0.5x1.0, 8T60 K, and under hydrostatic pressures up to 2200 bars. The structural hcp-cubic (Pa3) phase transition is identified as a martensitic transformation with a wide transformation hysteresis. For x0.8 and T30 K the solid solutions show the orientational glass state, which is characterized by a superposition of inhomogeneous and homogeneous lattice strains. The inhomogeneous component is described by the random-field model. The homogeneous component corresponds to an orthorhombic distortion of the hcp lattice. Two …
Phase diagram ofN2:Ar:CO solid solutions
Ces solutions sont etudiees par diffraction des rayons X. Le diagramme de phase ternaire presente trois regions monophases (hc, cfc et Pa3) et de larges regions a deux phases (Pa3 cfc et hc cfc). On demontre l'influence de la vitesse de refroidissement sur la structure a basse temperature