Pressure-induced phase transition of La2Zr2O7 and La0.5Gd1.5Zr2O7 pyrochlore

In situ high-pressure experiments on La2Zr2O7 and La0.5Gd1.5Zr2O7 have been carried out at up to approximately 40 GPa using synchrotron X-ray diffraction and Raman spectroscopy combined with a diamond anvil cell technique.

Download Full-text

PHASE TRANSITION IN LAYERED PEROVSKITE LIKE MANGANATE Ca3Mn2O7 UNDER HIGH PRESSURE

International Journal of Modern Physics B ◽

10.1142/s0217979201007117 ◽

2001 ◽

Vol 15 (18) ◽

pp. 2491-2497 ◽

Cited By ~ 1

Author(s):

J. L. ZHU ◽

L. C. CHEN ◽

R. C. YU ◽

F. Y. LI ◽

J. LIU ◽

...

Keyword(s):

Crystal Structure ◽

High Pressure ◽

Diamond Anvil Cell ◽

The Other ◽

Layered Perovskite ◽

X Ray Diffraction ◽

Two Phase ◽

X Ray ◽

Diamond Anvil

In situ high pressure energy dispersive X-ray diffraction measurements on layered perovskite-like manganate Ca 3 Mn 2 O 7 under pressures up to 35 GPa have been performed by using diamond anvil cell with synchrotron radiation. The results show that the structure of layered perovskite-like manganate Ca 3 Mn 2 O 7 is unstable under pressure due to the easy compression of NaCl-type blocks. The structure of Ca 3 Mn 2 O 7 underwent two phase transitions under pressures in the range of 0~35 GPa. One was at about 1.3 GPa with the crystal structure changing from tetragonal to orthorhombic. The other was at about 9.5 GPa with the crystal structure changing from orthorhombic back to another tetragonal.

Download Full-text

Crystal structure and the equation of state of thorium monophosphide for pressures up to 50 GPa

Journal of Applied Crystallography ◽

10.1107/s002188988801091x ◽

1989 ◽

Vol 22 (1) ◽

pp. 61-63 ◽

Cited By ~ 15

Author(s):

J. S. Olsen ◽

L. Gerward ◽

U. Benedict ◽

H. Luo ◽

O. Vogt

Keyword(s):

Crystal Structure ◽

Phase Transition ◽

High Pressure ◽

Synchrotron Radiation ◽

Diamond Anvil Cell ◽

X Ray Diffraction ◽

Pressure Derivative ◽

X Ray ◽

Cscl Structure ◽

Diamond Anvil

High-pressure X-ray diffraction studies have been performed on ThP using synchrotron radiation and a diamond-anvil cell. The bulk modulus B 0 and its pressure derivative B′0 have been determined (B 0 = 137 GPa; B′0 = 5.1). A phase transition from the NaCl structure to the CsCl structure was observed at about 30 GPa.

Download Full-text

An easy to use X-ray collimator for Mao-Bell type diamond anvil cell

Powder Diffraction ◽

10.1154/1.2362856 ◽

2006 ◽

Vol 21 (4) ◽

pp. 320-322 ◽

Cited By ~ 1

Author(s):

P. Ch. Sahu ◽

N. R. Sanjay Kumar ◽

N. V. Chandra Shekar ◽

N. Subramanian

Keyword(s):

High Pressure ◽

Diamond Anvil Cell ◽

Radiation Safety ◽

Incident Beam ◽

X Ray Diffraction ◽

X Ray ◽

Safety Requirements ◽

Diamond Anvil ◽

Special Precaution

An incident beam X-ray collimator for Mao-Bell type diamond anvil cell (DAC) has been developed. Alignment of the collimator is carried out in situ while viewing the image of the collimated X-ray spot formed on a thin layer of fluorescent material spread on the diamond anvil culets with the help of a microscope. Special precaution has been taken to meet the radiation safety requirements during alignment and routine use. This collimator is of immense help for laboratory based high pressure X-ray diffraction experiments.

Download Full-text

HIGH-PRESSURE STRUCTURE STUDY OF CuBa2Ca3Cu4O10 + δ SUPERCONDUCTOR

Modern Physics Letters B ◽

10.1142/s0217984905008335 ◽

2005 ◽

Vol 19 (06) ◽

pp. 313-316

Author(s):

X. M. QIN ◽

Y. YU ◽

G. M. ZHANG ◽

F. Y. LI ◽

J. LIU ◽

...

Keyword(s):

Crystal Structure ◽

High Pressure ◽

Room Temperature ◽

Diamond Anvil Cell ◽

Structure Study ◽

X Ray Diffraction ◽

X Ray ◽

Diamond Anvil ◽

Murnaghan Equation

In-situ high-pressure energy dispersive X-ray diffraction measurements on CuBa 2- Ca 3 Cu 4 O 10 + δ (Cu-1234) have been performed by using diamond anvil cell (DAC) device with synchrotron radiation. The results suggest that the crystal structure of Cu-1234 superconductor is stable under pressures up to 34 GPa at room temperature. According to the Birch–Murnaghan equation of state, the bulk modulus is obtained to be ~ 150 GPa.

Download Full-text

In situ X-ray diffraction measurements of the fcc–hcp phase transition boundary of an Fe–Ni alloy in an internally heated diamond anvil cell

Physics and Chemistry of Minerals ◽

10.1007/s00269-012-0490-3 ◽

2012 ◽

Vol 39 (4) ◽

pp. 329-338 ◽

Cited By ~ 19

Author(s):

Tetsuya Komabayashi ◽

Kei Hirose ◽

Yasuo Ohishi

Keyword(s):

Phase Transition ◽

Diamond Anvil Cell ◽

X Ray Diffraction ◽

X Ray ◽

Transition Boundary ◽

Ni Alloy ◽

Diamond Anvil ◽

Phase Transition Boundary

Download Full-text

High-Pressure X-Ray Diffraction Studies of Elastic Anomalies in Superlattice

MRS Proceedings ◽

10.1557/proc-231-355 ◽

1991 ◽

Vol 231 ◽

Cited By ~ 1

Author(s):

Y. Fujii ◽

Y. Ohishi ◽

H. Konishi ◽

N. Nakayama ◽

T. Shinjo

Keyword(s):

Phase Transition ◽

High Pressure ◽

Diamond Anvil Cell ◽

Orthorhombic Phase ◽

X Ray Diffraction ◽

X Ray ◽

Layer Stacking ◽

Diamond Anvil ◽

Elastic Anomalies ◽

Structural Aspects

AbstractThis paper has made an overview on elastic and structural aspects of three distinct superlattices under hydrostatic pressure up to about 8GPa, which were studied by our unique x-ray diffraction technique incorporated with a diamond-anvil cell. They are metallic fcc/fcc Au/Ni, bcc/fcc Mo/Ni, and semiconductive epitaxially-grown PbSe/SnSe superlattices. In their layer-stacking direction, both metallic superlattices show the supermodulus behavior while the semiconductive one doesn't. However, its pressure-driven cubic-to-orthorhombic phase transition, successively taking place in the SnSe and PbSe layers, has been found to significantly shift by stress due to its epitaxial growth.

Download Full-text

High Pressure Synchrotron Diffraction of KCa2Nb3O10, a Layered Perovskite Compound

MRS Proceedings ◽

10.1557/proc-524-133 ◽

1998 ◽

Vol 524 ◽

Cited By ~ 2

Author(s):

K. A. Steiner ◽

W. T. Petuskey

Keyword(s):

Phase Transition ◽

High Pressure ◽

Diamond Anvil Cell ◽

Orthorhombic Phase ◽

Layered Perovskite ◽

X Ray Diffraction ◽

Synchrotron Diffraction ◽

X Ray ◽

Lattice Constants ◽

Diamond Anvil

ABSTRACTHigh pressure synchrotron x-ray diffraction experiments were conducted on KCa2Nb3O10, to determine lattice constants as a function of pressure. A diamond anvil cell was used to produce pressures up to 66 GPa. A phase transition occurred at 13.5 GPa. From the lattice constants, linear compressibilities of 8.55 × 10-4 GPa-1 in the a direction, -9.40 × 10-4 GPa-1 in the b direction, and 142 × 10-4 GPa-1 in the c direction, and a bulk modulus of 68.5 GPa were found for the lower pressure orthorhombic phase.

Download Full-text