New high-pressure monoclinic phase of Sn

2021 ◽  
pp. 114635
Author(s):  
Xin Bao ◽  
Hongyun Lang ◽  
Xinjun Ma ◽  
Tianji Ou ◽  
Meiguang Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Monoclinic Phase

A new, layered monoclinic phase of Co3O4 at high pressure

2015 ◽  
Vol 17 (30) ◽  
pp. 19957-19961 ◽  
Author(s):  
Thanayut Kaewmaraya ◽  
Wei Luo ◽  
Xiao Yang ◽  
Puspamitra Panigrahi ◽  
Rajeev Ahuja
Keyword(s):  
High Pressure ◽  
Electronic Properties ◽  
Crystal Structures ◽  
Monoclinic Phase

We present the crystal structures and electronic properties of a Co3O4 spinel under high pressure.

Monoclinic phase of boron nitride appearing during the hexagonal cubic phase transition at high pressure and high temperature

1996 ◽  
Vol 68 (2) ◽  
pp. 182-184 ◽  
Author(s):  
Shigeo Horiuchi ◽  
Lian‐Long He ◽  
Mitsuko Onoda ◽  
Minoru Akaishi
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Monoclinic Phase ◽  
Cubic Phase

ELECTRONIC AND MAGNETIC STRUCTURE OF THE HIGH PRESSURE PHASE OF Li2CuO2

2011 ◽  
Vol 25 (26) ◽  
pp. 3409-3414 ◽  
Author(s):  
ZHI LI ◽  
JOHN S. TSE ◽  
SHUJIE YOU ◽  
C. Q. JIN ◽  
TOSHIAKI IITAKA
Keyword(s):  
High Pressure ◽  
Electronic Structure ◽  
Finite Temperature ◽  
Monoclinic Phase ◽  
Magnetocrystalline Anisotropy ◽  
Antiferromagnetic Interaction ◽  
High Pressure Phase ◽  
First Principle ◽  
Antiferromagnetic State ◽  
Pressure Phase

The magnetic and electronic structure of monoclinic phase Li 2 CuO 2 under high pressure is studied by first principle with GGA+U calculations. It is shown that the C-type antiferromagnetic state of the ambient structure is maintained in the monoclinic high pressure phase. This is due to the preservation of the ferromagnetic CuO 2 chains in the structure. It is expected that the weak interchain antiferromagnetic interaction can easily disrupt by finite temperature, and the magnetocrystalline anisotropy in this insulator is extremely weak.

High-pressure phase transitions in ordered and disordered Bi2Te2Se

2015 ◽  
Vol 44 (31) ◽  
pp. 14077-14084 ◽  
Author(s):  
M. B. Nielsen ◽  
P. Parisiades ◽  
S. R. Madsen ◽  
M. Bremholm
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Electronic Transition ◽  
Monoclinic Phase ◽  
High Pressure Phase ◽  
Structural Analogue ◽  
Lower Symmetry ◽  
Pressure Phase

Bi2Te2Se appears to undergo an electronic transition near 3 GPa, changing to a monoclinic phase near 10 GPa followed by a structural analogue of the cubic alloy of Bi2Te3 but low-angle diffraction demonstrates lower symmetry.

scholarly journals Experimental and Theoretical Investigations on Structural and Vibrational Properties of Melilite-Type Sr2ZnGe2O7 at High Pressure and Delineation of a High-Pressure Monoclinic Phase

2015 ◽  
Vol 54 (13) ◽  
pp. 6594-6605 ◽  
Author(s):  
S. Nagabhusan Achary ◽  
Daniel Errandonea ◽  
David Santamaria-Perez ◽  
Oscar Gomis ◽  
Sadiqua J. Patwe ◽  
...  
Keyword(s):  
High Pressure ◽  
Monoclinic Phase ◽  
Vibrational Properties ◽  
Theoretical Investigations

scholarly journals Greigite (Fe3S4) is thermodynamically stable: Implications for its terrestrial and planetary occurrence

2020 ◽  
Vol 117 (46) ◽  
pp. 28645-28648
Author(s):  
Tamilarasan Subramani ◽  
Kristina Lilova ◽  
Mykola Abramchuk ◽  
Kurt D. Leinenweber ◽  
Alexandra Navrotsky
Keyword(s):  
High Pressure ◽  
Monoclinic Phase ◽  
Iron Sulfide ◽  
Enthalpies Of Formation ◽  
Stable Phase ◽  
Fine Grained ◽  
Low Surface Energy ◽  
Iron Sulfide Minerals ◽  
The Common ◽  
The Stability

Iron sulfide minerals are widespread on Earth and likely in planetary bodies in and beyond our solar system. Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe3S4spinel (greigite), and its high-pressure monoclinic phase, we show that greigite is a stable phase in the Fe–S phase diagram at ambient temperature. The thermodynamic stability and low surface energy of greigite supports the common occurrence of fine-grained Fe3S4in many anoxic terrestrial settings. The high-pressure monoclinic phase, thermodynamically metastable below about 3 GPa, shows a calculated negative P-T slope for its formation from the spinel. The stability of these three phases suggests their potential existence on Mercury and their magnetism may contribute to its present magnetic field.

Pressure-Induced Nano-Crystallization of Y2O3

2011 ◽  
Vol 1297 ◽  
Author(s):  
Stuart Deutsch ◽  
Jafar F. Al-Sharab ◽  
Bernard H. Kear ◽  
Stephen D. Tse
Keyword(s):  
Phase Transition ◽  
Grain Size ◽  
High Pressure ◽  
Phase Transformation ◽  
Monoclinic Phase ◽  
Transformation Process ◽  
Coarse Grained ◽  
Nanocrystalline State ◽  
Phase Transformation Process ◽  
Reversible Phase

ABSTRACTA reversible-phase transformation process to convert coarse-grained polycrystalline cubic-Y2O3 directly into the nanocrystalline state is being developed. The process involves a forward cubic-to-monoclinic phase transition under high pressure and a backward transformation from monoclinic-to-cubic under a lower pressure. The process has been used to reduce the grain size of fully dense cubic-Y2O3 from 300 μm to 0.1 μm. A surface modification effect, comprising a columnar-grained structure, has also been observed. Preliminary work indicates that the surface structure is modified, apparently formed by interaction between the graphite heater and sample.

Crystal structure of the high-pressure monoclinic phase-II of cristobalite, SiO2

2000 ◽  
Vol 64 (3) ◽  
pp. 569-576 ◽  
Author(s):  
M. T. Dove ◽  
M. S. Craig ◽  
D. A. Keen ◽  
W. G. Marshall ◽  
S. A. T. Redfern ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Phase Ii ◽  
Monoclinic Phase ◽  
Β Phase ◽  
Α Phase ◽  
Temperature And Pressure ◽  
Pressure Phase

AbstractThe crystal structure of the high-pressure phase-II of cristobalite has been solved by neutron diffraction (space group P21/c, a = 8.3780(11) Å, b = 4.6018(6) Å, c = 9.0568(13) Å, β = 124.949(7)°, at P = 3.5 GPa). This phase corresponds to a distortion of the high-temperature cubic β-phase, rather than of the ambient temperature and pressure tetragonal α-phase.

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