scholarly journals Can quasicrystals survive in planetary collisions?

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Vincenzo Stagno ◽  
Luca Bindi ◽  
Sota Takagi ◽  
Atsushi Kyono
Keyword(s):  
Ambient Pressure ◽  
Structural Phase ◽  
Volume Data ◽  
Pressure Derivative ◽  
Pressure Medium ◽  
History Of ◽  
Diamond Anvil ◽  
State Models ◽  
The Stability ◽  
Murnaghan Equation

AbstractWe investigated the compressional behavior of i-AlCuFe quasicrystal using diamond anvil cell under quasi-hydrostatic conditions by in situ angle-dispersive X-ray powder diffraction measurements (in both compression and decompression) up to 76 GPa at ambient temperature using neon as pressure medium. These data were compared with those collected up to 104 GPa using KCl as pressure medium available in literature. In general, both sets of data indicate that individual d-spacing shows a continuous decrease with pressure with no drastic changes associated to structural phase transformations or amorphization. The d/d0, where d0 is the d-spacing at ambient pressure, showed a general isotropic compression behavior. The zero-pressure bulk modulus and its pressure derivative were calculated fitting the volume data to both the Murnaghan- and Birch-Murnaghan equation of state models. Results from this study extend our knowledge on the stability of icosahedrite at very high pressure and reinforce the evidence that natural quasicrystals formed during a shock event in asteroidal collisions and survived for eons in the history of the Solar System.

Structural Evolution of BaVS3 Under Pressure

2008 ◽  
Vol 63 (6) ◽  
pp. 661-667 ◽  
Author(s):  
Alka B. Garg ◽  
Viswanathan Vijayakumar ◽  
Amitava Choudhury ◽  
Hans D. Hochheimer
Keyword(s):  
Structural Transition ◽  
Ambient Pressure ◽  
Structural Phase ◽  
Structural Evolution ◽  
Structural Phase Transitions ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
One Dimensional ◽  
A Value ◽  
Murnaghan Equation

Results of a high-pressure angle dispersive X-ray diffraction and electrical resistance study on quasi one-dimensional BaVS3 are reported. They show that no structural transition occurs up to 26 GPa. However, there is evidence of gradual disordering indicated by the broadening of the diffraction lines. p-V data fitted to a Birch-Murnaghan equation of state yields a value of the room-temperature, ambient-pressure bulk modulus of 77.3 GPa with a pressure derivative of 4.03. It is proposed that under compression structural phase transitions resulting from static displacements of V ions that are observed at low temperature are suppressed. Instead, a partial “polymerization” of V ions that is dynamic in nature and allows enhanced hopping conduction, starts near 3 GPa and saturates above 15 GPa.

scholarly journals Equation of State of a Natural Chromian Spinel at Ambient Temperature

Minerals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 591 ◽  
Author(s):  
Zhongying Mi ◽  
Weiguang Shi ◽  
Lifei Zhang ◽  
Sean Shieh ◽  
Xi Liu
Keyword(s):  
Equation Of State ◽  
Simple Algorithm ◽  
Experimental Result ◽  
Chromian Spinel ◽  
Chemical Compositions ◽  
Volume Data ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
Diamond Anvil ◽  
Murnaghan Equation

A natural chromian spinel with the composition (Mg0.48(3)Fe0.52(3))(Fe0.06(1)Al0.28(1)Cr0.66(2))2O4 was investigated up to 15 GPa via synchrotron X-ray diffraction with a diamond-anvil cell at room temperature. No phase transition was clearly observed up to the maximum experimental pressure. The pressure–volume data fitted to the third-order Birch–Murnaghan equation of state yielded an isothermal bulk modulus ( K T 0 ) of 207(5) GPa and its first pressure derivative ( K T 0 ′ ) of 3.2(7), or K T 0 = 202(2) GPa with K T 0 ′ fixed as 4. With this new experimental result and the results on some natural chromian spinels in the literature, a simple algorithm describing the relation between the K T 0 and the compositions of the natural chromian spinels was proposed. To examine this algorithm further, more compression experiments should be performed on natural chromian spinels with different chemical compositions.

scholarly journals Synthesis and Compressibility of Novel Nickel Carbide at Pressures of Earth’s Outer Core

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 516
Author(s):  
Timofey Fedotenko ◽  
Saiana Khandarkhaeva ◽  
Leonid Dubrovinsky ◽  
Konstantin Glazyrin ◽  
Pavel Sedmak ◽  
...  
Keyword(s):  
Equation Of State ◽  
Outer Core ◽  
Direct Reaction ◽  
Volume Data ◽  
X Ray Diffraction ◽  
Nickel Carbide ◽  
Diamond Anvils ◽  
Group A ◽  
Diamond Anvil ◽  
Murnaghan Equation

We report the high-pressure synthesis and the equation of state (EOS) of a novel nickel carbide (Ni3C). It was synthesized in a diamond anvil cell at 184(5) GPa through a direct reaction of a nickel powder with carbon from the diamond anvils upon heating at 3500 (200) K. Ni3C has the cementite-type structure (Pnma space group, a = 4.519(2) Å, b = 5.801(2) Å, c = 4.009(3) Å), which was solved and refined based on in-situ synchrotron single-crystal X-ray diffraction. The pressure-volume data of Ni3C was obtained on decompression at room temperature and fitted to the 3rd order Burch-Murnaghan equation of state with the following parameters: V0 = 147.7(8) Å3, K0 = 157(10) GPa, and K0' = 7.8(6). Our results contribute to the understanding of the phase composition and properties of Earth’s outer core.

scholarly journals Structural Study of δ-AlOOH Up to 29 GPa

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1055
Author(s):  
Dariia Simonova ◽  
Elena Bykova ◽  
Maxim Bykov ◽  
Takaaki Kawazoe ◽  
Arkadiy Simonov ◽  
...  
Keyword(s):  
Phase Transition ◽  
Synchrotron Radiation ◽  
Equation Of State ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Volume Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diamond Anvil ◽  
Murnaghan Equation

A structure and equation of the state of δ-AlOOH has been studied at room temperature, up to 29.35 GPa, by means of single crystal X-ray diffraction in a diamond anvil cell using synchrotron radiation. Above ~10 GPa, we observed a phase transition with symmetry changes from P21nm to Pnnm. Pressure-volume data were fitted with the second order Birch-Murnaghan equation of state and showed that, at the phase transition, the bulk modulus (K0) of the calculated wrt 0 pressure increases from 142(5) to 216(5) GPa.

Pressure Tuning of Crystalline As2Te3

2004 ◽  
Vol 848 ◽  
Author(s):  
T. J. Scheidemantel ◽  
J. F. Meng ◽  
J. V. Badding
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Thermoelectric Power ◽  
Diamond Anvil Cell ◽  
Ambient Pressure ◽  
Structural Phase ◽  
Absolute Value ◽  
Pressure Tuning ◽  
Diamond Anvil ◽  
Pressure Phase

ABSTRACTWe report the pressure dependence of the thermoelectric power of As2Te3. Pressures up to 10 GPa were induced using a Mao-Bell diamond anvil cell. The absolute value of the thermoelectric power dropped from S ≈ 230μV/K at ambient pressure to S ≈ 75 GPa near 5 GPa. At 6 GPa it then increased rapidly to S ≈ 220βV/K. This behavior is indicative of a structural phase transition as suggested by previously published high pressure phase diagrams.

scholarly journals Vibrational Spectroscopy of GaN:Mg Under Pressure

2001 ◽  
Vol 693 ◽  
Author(s):  
M.D. McCluskey ◽  
K.K. Zhuravlev ◽  
M. Kneissl ◽  
W. Wong ◽  
D. Treat ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Stable Configuration ◽  
Microscopic Structure ◽  
First Principles Calculations ◽  
Free Standing ◽  
Pressure Derivative ◽  
Local Vibrational Mode ◽  
Bond Center ◽  
Diamond Anvil ◽  
Effect Of Hydrostatic Pressure

AbstractThe microscopic structure of Mg-H complexes in GaN has been a subject of intense theoretical and experimental investigation. In order to probe the Mg-H structure, we have studied the effect of hydrostatic pressure on the local vibrational mode (LVM) frequency. At ambient pressure, the LVM frequency is 3125 cm-1, which corresponds to a N-H stretching mode. In this study, Fourier-transform spectroscopy was performed on free-standing GaN:Mg,H samples in a diamond-anvil cell, with nitrogen as a pressure-transmitting fluid. The samples had been removed from their sapphire substrate by the laser-liftoff technique. The LVM frequency was measured, at liquid helium temperatures, for pressures ranging from 0 to 5 GPa. The pressure dependence of the frequency is nonlinear: first it decreases with pressure, then it increases. Comparison with first-principles calculations allows us to derive information about the microscopic structure of the Mg-H complex. The calculated stable configuration indeed gives rise to a frequency shift consistent with experiment. Based on the comparison between theory and experiment, we can exclude the bond-center configuration, which would result in a much larger pressure derivative than experimentally observed.

scholarly journals Compressional behavior of strontianite SrCO3 by synchrotron X-ray radiation diffraction: effects of pressure transmitting media

2020 ◽  
Vol 48 (5-6) ◽  
pp. 455-467
Author(s):  
BO ZHANG ◽  
SHIJIE HUANG ◽  
WEI CHEN ◽  
BO LI ◽  
ZHILIN YE ◽  
...  
Keyword(s):  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
X Ray ◽  
Diamond Anvil ◽  
Pressure Unit ◽  
Diffraction Patterns ◽  
Diffraction Effects ◽  
Murnaghan Equation

The compressional behavior of strontianite SrCO3 was investigated at ambient temperature and high pressure, using a diamond anvil cell (DAC) with Ne as a pressure transmitting medium. X-ray diffraction patterns were collected to ~52 GPa using in situ angle-dispersive synchrotron-based powder X-ray diffraction (XRD). A phase transition was observed at ~20 GPa, and no indications of further transitions were detected up to ~52 GPa. The pressure-volume (P-V) data within 0.27-17.35 GPa were fitted to a third-order Birch-Murnaghan equation of state (BM3 EoS) to obtain the elastic coefficients including zero-pressure unit-cell volume, isothermal bulk modulus and its pressure derivative: V0 = 258.4(3) Å3, KT0 = 55(2) GPa, and K'T0 = 4.3(3). The V0 and KT0 were obtained as 258.1(2) Å3 and 57.1(6) GPa, when fixed K'T0 = 4. The axial compressional behavior of strontianite was also investigated by fitting the pressure-lattice parameter data to a parameterized form of the BM3 EoS, and the compression of the a-, b-, and c-axis was strongly anisotropic, with Ka0 = 104(6), Kb0 = 52(12), and Kc0 = 31.6(5) GPa. Based on this and previous studies using different pressure transmitting media (PTM), the effects PTM on the compressional behavior of strontianite were discussed.

CORRELATION BETWEEN STRUCTURAL STABILITY AND ELECTRONIC STRUCTURE OF UGa3 UP TO 30 GPa

2011 ◽  
Vol 25 (04) ◽  
pp. 551-559 ◽  
Author(s):  
V. KATHIRVEL ◽  
SHARAT CHANDRA ◽  
N. V. CHANDRA SHEKAR ◽  
P. CH. SAHU ◽  
M. RAJAGOPALAN
Keyword(s):  
Structural Stability ◽  
High Pressures ◽  
Structural Phase ◽  
Maximum Pressure ◽  
Full Potential ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
Augmented Plane Wave ◽  
Diamond Anvil ◽  
Structure Calculations

High-pressure angle-dispersive X-ray diffraction experiments were performed on UGa 3 up to 30 GPa within a diamond-anvil cell. UGa 3 remains in its cubic AuCu 3 type structure up to the maximum pressure studied and does not show any structural phase transition. To understand the structural stability of UGa 3, band structure calculations were performed as a function of reduced volume using the full-potential linear augmented plane wave (FP-LAPW) method. The results show that the Fermi level coincides with a deep valley in the density of states (DOS) curve in the antiferromagnetic state, whereas it lies near a valley (towards the bonding side) in the nonmagnetic state. At high pressures, the DOS near EF does not show much variation in both the cases. The experimental and theoretical equation of state, bulk modulus, and its pressure derivative values are also reported. The pressure dependence of magnetic moment shows a linear decrease at the rate of dμ/dP = -0.027 μ B / GPa .

scholarly journals High Pressure Elastic Behavior of Synthetic Mg3Y2(SiO4)3Garnet up to 9 GPa

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Dawei Fan ◽  
Maining Ma ◽  
Shuyi Wei ◽  
Zhiqiang Chen ◽  
Hongsen Xie
Keyword(s):  
National Laboratory ◽  
Brookhaven National Laboratory ◽  
Elastic Behavior ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
Cell Parameters ◽  
Diamond Anvil ◽  
Synchrotron Light ◽  
Murnaghan Equation

The compression behavior of synthetic magnesium- (Mg-) yttrium (Y) garnet Mg3Y2(SiO4)3has been investigated upto about 8.79 GPa at 300 K usingin situangle-dispersive X-ray diffraction and a diamond anvil cell at the beamline X17C, National Synchrotron Light Source, Brookhaven National Laboratory. No phase transition has been observed within the pressure range investigated. The unit-cell parameters and volume decreased systematically with increasing pressure, and a reliable isothermal bulk modulus (KT0) and its pressure derivative (KT0′) were obtained in this study. The values of zero-pressure volumeV0,K0, andK0′refined with a third-order Birch-Murnaghan equation of state areV0=1727.9±0.2 Å3,KT0=145±3 GPa, andK0′=8.5±0.9. IfKT0′is fixed at 4,KT0is obtained as158±2 GPa.

scholarly journals The equation of state of thePmmnphase of NiSi

2015 ◽  
Vol 48 (6) ◽  
pp. 1914-1920 ◽  
Author(s):  
Oliver T. Lord ◽  
Andrew R. Thomson ◽  
Elizabeth T. H. Wann ◽  
Ian G. Wood ◽  
David P. Dobson ◽  
...  
Keyword(s):  
Equation Of State ◽  
Orthorhombic Phase ◽  
X Ray Diffraction ◽  
Third Order ◽  
X Ray ◽  
Pressure Medium ◽  
Diamond Anvil ◽  
Pressure Standard ◽  
Murnaghan Equation ◽  
Made In

The equation of state of the orthorhombic phase of NiSi withPmmnsymmetry has been determined at room temperature from synchrotron-based X-ray diffraction measurements of its lattice parameters, made in a diamond anvil cell. Measurements were performed up to 44 GPa, using Ne as the pressure medium and Au as the pressure standard. The resulting pressure–volume (P–V) data have been fitted with a Birch–Murnaghan equation of state of third order to yieldV0= 11.650 (7) Å3 atom−1,K0= 162 (3) GPa andK0′ = 4.6 (2). In addition,P–Vdata have been collected on Ni53Si47in the B20 structure using both Ne and He as the pressure media and Cu and Au as the pressure standards, also to 44 GPa. A fit using the same Birch–Murnaghan equation of state of third order yieldsV0= 11.364 (6) Å3 atom−1,K0= 171 (4) GPa andK0′ = 5.5 (3).

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