Lutetium: High pressure polymorph and compression

doi:10.1016/0022-3697(75)90127-4

Journal of Physics and Chemistry of Solids

Volume 36, Issue 1, January 1975, Pages 31-35

https://doi.org/10.1016/0022-3697(75)90127-4 Get rights and content

Abstract

The effect of pressure on the lattice parameters of the h.c.p. phase of Lu has been studied up to 230 kbar at 23 ± 3°C by means of X-ray diffraction employing a diamond-anvil cell. The data fitted to the Birch equation yield an isothermal bulk modulus of 460 ± 20 kbar with a pressure derivative of 2.8 ± 0.5. The axial ratio $(c a)$ decreases nonlinearly with increasing pressure, the decrease being 2.4 per cent at 230 kbar. When the pressure exceeds 230 kbar, Lu transforms reversibly from the h.c.p. phase to the Sm-type structure. The transition occurs with increasing pressure in the range of 230 ± 5 kbar. The lattice parameters of the Sm-type structure at about 231 kbar are a = 3.176 ± 0.006 Å and c = 21.77 ± 0.04 Å, and the volume change is $−0.21 cm^{3} mole$ or −1.6 per cent of the volume of the h.c.p. phase.

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^∗: Present address: Research School of Earth Sciences, The Australian National University, Canberra, A.C.T. 2600, Australia.

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Lutetium: High pressure polymorph and compression

Abstract

J. Appl. Phys.

J. Appl. Phys.

Science

Proc. Amer. Acad. Arts Sci.

Progress in Very High Pressure Research

Sov. Phys. JETP

Sov. Phys. Usp.

Z. Anorg. Chem.

Acta Crystallogr.

J. Phys. Chem. Solids

Accurate Characterization of the High Pressures Environment

Amer. Mineral.