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X‐ray diffraction of cubic Gd 2 O 3 /Er under high pressure
Author(s) -
Zou Xu,
Gong Chen,
Liu Bingbing,
Li Quanjun,
Li Zepeng,
Liu Bo,
Liu Ran,
Liu Jing,
Chen Zhiqiang,
Zou Bo,
Cui Tian,
Bai Xue,
Song Hongwei
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000706
Subject(s) - monoclinic crystal system , diffraction , phase (matter) , materials science , crystallography , diamond anvil cell , equation of state , hexagonal phase , phase transition , x ray crystallography , hexagonal crystal system , selected area diffraction , analytical chemistry (journal) , chemistry , crystal structure , transmission electron microscopy , thermodynamics , nanotechnology , optics , physics , organic chemistry , chromatography
In this paper, we report the in situ high pressure X‐ray diffraction studies on Er 3+ doped Gd 2 O 3 in a diamond anvil cell up to 39.8 GPa at room temperature. Several phase transitions have been identified in our studies. The structural transformation from a starting cubic phase to a hexagonal phase occurred during the sample compression process, at 8.57 GPa. And the hexagonal phase was stable from 12.5 GPa up to the highest pressure in this study but was not quenchable and transformed to a monoclinic phase after pressure release. An anomalous high pressure behavior in the hexagonal type Gd 2 O 3 phase was observed, which might be caused by an electron transition influenced by Er 3+ ions doping. By fitting the compression data to the Birch–Murnaghan equation of state, the bulk moduli of the cubic and two hexagonal (at p < 19.9 GPa and p > 27.0 GPa) Gd 2 O 3 phases were determined to be 164 ± 3, 185 ± 7, and 150 ± 10 GPa with $B'_{0} = 4$ , respectively.