Structure analysis of high-pressure metallic state of iodine

1978 ◽  
Vol 18 (2) ◽  
pp. 715-719 ◽  
Author(s):  
C. Shimomura ◽  
K. Takemura ◽  
Y. Fujii ◽  
S. Minomura ◽  
M. Mori ◽  
...  
Keyword(s):  
High Pressure ◽  
Structure Analysis ◽  
Metallic State

Structural transformation yielding an unusual metallic state in liquidAs2S3under high pressure

2010 ◽  
Vol 82 (14) ◽  
Author(s):  
V. V. Brazhkin ◽  
Y. Katayama ◽  
M. V. Kondrin ◽  
A. G. Lyapin ◽  
H. Saitoh
Keyword(s):  
High Pressure ◽  
Structural Transformation ◽  
Metallic State

X-ray powder crystal structure analysis of high pressure tungsten dioxide. On the information in weak reflections

1994 ◽  
Vol 209 (8) ◽  
Author(s):  
M. Sundberg ◽  
P.-E. Werner ◽  
I. P. Zibrov
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
X Ray

AbstractA high-pressure modification of tungsten dioxide (hp-WOIn the hp-WO

scholarly journals Crystal structure of the λ-Al13Fe4-type intermetallic (Al,Cu)13(Fe,Cu)4

IUCrData ◽  
2018 ◽  
Vol 3 (3) ◽  
Author(s):  
Cong Liu ◽  
Changzeng Fan
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Structure Analysis ◽  
Structure Type ◽  
X Ray ◽  
X Ray Scattering ◽  
Iron Copper ◽  
Aluminium Copper ◽  
High Pressure Sintering ◽  
New Phase

An (Al,Cu)13(Fe,Cu)4phase of [trideca(aluminium/copper) tetra(iron/copper)] was obtained by the high-pressure sintering (HPS) process of a mixture with composition Al78Cu15Fe7. Structure analysis suggests that Cu atoms can replace both Al and Fe atoms. Such findings support previous anomalous X-ray scattering (AXS) results although deviate from other reports. The new phase adopts the λ-Al13Fe4structure type where Cu atoms partially occupy the 2cand 4isites for Al and Fe atoms, respectively, with occupancies of 0.233 (5) and 0.173 (16).

High-Pressure Synthesis and Crystal Structure Analysis of NaMn2O4 with the Calcium Ferrite-Type Structure.

ChemInform ◽  
2006 ◽  
Vol 37 (15) ◽  
Author(s):  
Junji Akimoto ◽  
Junji Awaka ◽  
Norihito Kijima ◽  
Yasuhiko Takahashi ◽  
Yuichi Maruta ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Type Structure ◽  
Calcium Ferrite ◽  
Synthesis And Crystal Structure ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

HIGH PRESSURE STUDY OF NOVEL ELECTRONIC PROPERTIES IN Sr2Fe(W1-xMox)O6 NEAR METAL-INSULATOR TRANSITION

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3279-3284
Author(s):  
G. OOMI ◽  
S. KAJI ◽  
Y. TOMIOKA ◽  
Y. TOKURA
Keyword(s):  
High Pressure ◽  
Double Perovskite ◽  
Insulator Transition ◽  
Metallic State ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Electrical Resistivities ◽  
Insulating Properties ◽  
High Pressure Study ◽  
Variable Range Hopping Conduction

Electrical resistivities of double perovskite oxides Sr 2 Fe ( W 1-x Mo x) O 6 have been measured at high pressure and high magnetic field to elucidate the transport properties of these materials. It is found that the main mechanism of the transport in the semiconducting phase is variable range hopping conduction and the insulating properties are suppressed by high pressure to show a crossover to metallic state. The magnetoresistances of these oxides are revealed to decrease at high pressure above 1 GPa. Extremely large Grüneisen parameters are found near x = 0.2, where the metal-insulator transition occurs. The origin for these properties will be briefly discussed in connection with the phase diagram.

scholarly journals SENJU: a new time-of-flight single-crystal neutron diffractometer at J-PARC

2016 ◽  
Vol 49 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Takashi Ohhara ◽  
Ryoji Kiyanagi ◽  
Kenichi Oikawa ◽  
Koji Kaneko ◽  
Takuro Kawasaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystal ◽  
Magnetic Structure ◽  
Structure Analysis ◽  
Materials Science ◽  
Time Of Flight ◽  
Extreme Environment ◽  
High Pressure Cell ◽  
Neutron Diffractometer ◽  
Sample Chamber

SENJU is a new single-crystal time-of-flight neutron diffractometer installed at BL18 at the Materials and Life Science Experimental Facility of the Japan Accelerator Research Complex (J-PARC). The diffractometer was designed for precise crystal and magnetic structure analyses under multiple extreme sample environments such as low temperature, high pressure and high magnetic field, and for diffraction measurements of small single crystals down to 0.1 mm3in volume. SENJU comprises three choppers, an elliptical shape straight supermirror guide, a vacuum sample chamber and 37 scintillator area detectors. The moderator-to-sample distance is 34.8 m, and the sample-to-detector distance is 800 mm. The wavelength of incident neutrons is 0.4–4.4 Å (first frame). Because short-wavelength neutrons are available and the large solid angle around the sample position is covered by the area detectors, a large reciprocal space can be simultaneously measured. Furthermore, the vacuum sample chamber and collimator have been designed to produce a very low background level. Thus, the measurement of a small single crystal is possible. As sample environment devices, a newly developed cryostat with a two-axis (ω and φ axes) goniometer and some extreme environment devices,e.g.a vertical-field magnet, high-temperature furnace and high-pressure cell, are available. The structure analysis of a sub-millimetre size (0.1 mm3) single organic crystal, taurine, and a magnetic structure analysis of the antiferromagnetic phase of MnF2have been performed. These results demonstrate that SENJU can be a powerful tool to promote materials science research.

Electronic, Magnetic and Structural Properties of the RFeO3 Antiferromagnetic-Perovskites at Very High Pressures

2002 ◽  
Vol 718 ◽  
Author(s):  
Moshe P. Pasternak ◽  
W. M. Xu ◽  
G. Kh. Rozenberg ◽  
R. D. Taylor
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Ambient Pressure ◽  
Magnetic Ordering ◽  
Exchange Interactions ◽  
Volume Reduction ◽  
Metallic State ◽  
First Order Phase Transition ◽  
Diamond Anvil ◽  
First Order Phase

AbstractAt ambient pressure the orthorhombic perovskites R-orthoferrites (R Ξ Lu, Eu, Y, Pr, and La) exhibit very large optical gaps. These large- gap Mott insulators in which the 3d5 high-spin ferric ions carry large local moments and magnetically order at TN > 600 K, undergo a sluggish structural first-order phase transition in the 30-50 GPa range, with the exception of the LuFeO3 which undergoes an isostructural volume reduction resulting from a high to low-spin crossover. High-pressure methods to 170 GPa using Mossbauer spectroscopy, resistance, and synchrotronbased XRD in diamond anvil cells were applied. Following the quasi-isostructural volume reduction (3-5%) the new phase the magnetic-ordering temperature is drastically reduced, to ∼ 100 K, the direct and super-exchange interactions are drastically weakened, and the charge-transfer gap is substantially reduced. The high-pressure (HP) phases of the La and Pr oxides, at their inception, are composed of high- and low-spin Fe3+ magnetic sublattices, the abundance of the latter increasing with pressure but HP phases of the Eu, Y, and Lu oxides consist solely of low-spin Fe3+. Resistance and Mössbauer studies in La and Pr orthoferrites reveal the onset of a metallic state with moments starting at P > 120 GPa. Based on the magnetic and electrical data of the latter species, a Mott phase diagram was established.

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