Electronic and structural properties of rare earth metals at normal and high pressures: Eu and Yb

1986 ◽  
Vol 59 (3-4) ◽  
pp. 277-286 ◽  
Author(s):  
B.I. Min ◽  
H.J.F. Jansen ◽  
T. Oguchi ◽  
A.J. Freeman
Keyword(s):  
Rare Earth ◽  
Structural Properties ◽  
High Pressures ◽  
Rare Earth Metals ◽  
Electronic And Structural Properties

Allotropy in Some Rare-Earth Metals at High Pressures

Science ◽  
1964 ◽  
Vol 144 (3614) ◽  
pp. 69-71 ◽  
Author(s):  
G. J. Piermarini ◽  
C. E. Weir
Keyword(s):  
Rare Earth ◽  
High Pressures ◽  
Rare Earth Metals

General behavior of chalcogenides of rare-earth metals in transition to the intermediate valence state under high pressures

2014 ◽  
Vol 90 (16) ◽  
Author(s):  
O. B. Tsiok ◽  
L. G. Khvostantsev ◽  
A. V. Golubkov ◽  
I. A. Smirnov ◽  
V. V. Brazhkin
Keyword(s):  
Rare Earth ◽  
Valence State ◽  
High Pressures ◽  
Rare Earth Metals ◽  
Intermediate Valence ◽  
General Behavior

Image Plate X-Ray Diffraction Study of Distorted FCC Phase in Rare Earth Metals at High Pressures

1997 ◽  
Vol 499 ◽  
Author(s):  
Steven Beaver ◽  
Gary N. Chesnut ◽  
Yogesh K. Vohra
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Diffraction Study ◽  
High Pressures ◽  
Rare Earth Metals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fcc Phase ◽  
First Time ◽  
Pressure Phase

ABSTRACTA high-pressure phase of gadolinium is completely described for the first time. This phase, HR24, is found to exist at 46 GPa. The structure is examined for evidence of delocalization of the f shell, and the evolution of the HR24 phase with increasing pressure is discussed.

High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures

2008 ◽  
Vol 1104 ◽  
Author(s):  
Yogesh K. Vohra ◽  
Bagvanth Reddy Sangala ◽  
Andrew K. Stemshorn ◽  
Kevin M. Hope
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
High Pressures ◽  
Rare Earth Metals ◽  
Earth Metal ◽  
Heavy Rare Earth ◽  
High Pressure Studies ◽  
Volume Collapse ◽  
Diamond Anvil ◽  
Heavy Actinide

AbstractHigh-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp ⟶ Sm-type ⟶ dhcp ⟶ distorted fcc (hR-24) ⟶ monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures.

ELECTRONIC AND ATOMIC STRUCTURE OF $(\sqrt{5}\times\sqrt{5}){\rm R}27^{\circ}-{\rm Yb}/{\rm Al}(001)$

1997 ◽  
Vol 04 (06) ◽  
pp. 1155-1160 ◽  
Author(s):  
R. FASEL ◽  
P. AEBI ◽  
L. SCHLAPBACH ◽  
T. GREBER ◽  
J. OSTERWALDER
Keyword(s):  
Rare Earth ◽  
Surface Structure ◽  
Structural Properties ◽  
Atomic Structure ◽  
Substrate Surface ◽  
Rare Earth Metals ◽  
Mixed Valence ◽  
Interesting Phenomenon ◽  
Surface Patches

A particularly interesting phenomenon of rare-earth metals and their compounds is the mixed valence, which is intimately connected with the structural properties of a material. We report structural and spectroscopic results from the [Formula: see text] interface, with particular emphasis on the interplay between surface structure and valence. A strong reconstruction of the substrate surface is observed, with the Yb atoms occupying substitutional sites. A small fraction of Yb atoms is identified to occupy second-layer sites in otherwise unreconstructed surface patches. It is shown that these subsurface Yb atoms are in a mixed-valent 4f14-δ state, whereas the surface atoms in the [Formula: see text] geometry persist in the divalent 4f14 state.

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