Synthesis, Structure and Dielectric Properties of Na2SnTeO6

1998 ◽  
Vol 547 ◽  
Author(s):  
J.-H. Park ◽  
P.M. Woodward ◽  
J.B. Parise ◽  
I. Lubomirsky ◽  
O. Stafsudd
Keyword(s):  
Dielectric Constant ◽  
High Pressure ◽  
High Temperature ◽  
Dielectric Properties ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Powder Diffraction Data ◽  
Ambient Conditions ◽  
X Ray ◽  
High Pressure High Temperature

AbstractA new perovskite was recovered from the high pressure-high temperature treatment of the α-TlSbO3 form of Na2SnTeO6 at 7 GPa and 950 °C for 30 minutes. Synchrotron x-ray powder diffraction data show the space group is P21/n with a=5.40361 (5), b=5.46152(5), c=7.69288(7) Å and ß=90.034(3)°. Using disk samples of both polymorphs, the dielectric properties were measured as a function of temperature. At ambient conditions, the perovskite form has a more than 1.5 fold enhancement in dielectric constant compared to the α-TlSbO3 form while the molar volume and the molecular polarizability decrease.

Preparation of CoGe2-type NiSn2 at 10 GPa

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Andreas Leineweber ◽  
Marius Holger Wetzel ◽  
Stefan Martin ◽  
Shun-Li Shang ◽  
Zi-Kui Liu
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Temperature Treatment ◽  
Group Symmetry ◽  
High Temperature Treatment ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
High Pressure High Temperature ◽  
Type Crystal

Abstract An unprecedented NiSn2 intermetallic with CoGe2-type crystal structure has been recovered (at ambient conditions) after high-pressure high-temperature treatment of a Ni33Sn67 precursor alloy at 10 GPa and 400 °C. The orthorhombic structure with Aeam space group symmetry is pseudotetragonal. Based on the evaluation of powder X-ray diffraction data, lattice parameters of a = b = 6.2818 Å and c = 11.8960 Å have been determined. Complicated line broadening and results of a further microstructure analysis, however, imply a defective character of the crystal structure. First-principles calculations with different model structures and a comparison with structural trends in the literature suggest that at the high-pressure high-temperature conditions a CuAl2-type crystal structure might be stable, which transforms to the recovered CoGe2-type crystal structure upon cooling or the release of pressure.

Phase transformations in solid C60 at high-pressure-high-temperature treatment and the structure of 3D polymerized fullerites

1996 ◽  
Vol 220 (1-3) ◽  
pp. 149-157 ◽  
Author(s):  
V.D. Blank ◽  
S.G. Buga ◽  
N.R. Serebryanaya ◽  
G.A. Dubitsky ◽  
S.N. Sulyanov ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Phase Transformations ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
High Pressure High Temperature

Superconductivity in SmFeAsO0.8F 0.2 Synthesized by High Pressure High Temperature Treatment

2011 ◽  
Vol 197-198 ◽  
pp. 499-502
Author(s):  
Zheng He Hua ◽  
Heng Zhang ◽  
Ju Peng
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Electrical Transport ◽  
Upper Critical Field ◽  
Magnetic Field Effect ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
X Ray Diffraction ◽  
High Pressure High Temperature ◽  
High Transition

Superconducting SmFeAsO0.8F0.2 compound was successfully synthesized by high pressure high temperature treatment with pressure of 6 G Pa at 1400 °C for 2 hours. The X-ray diffraction pattern of the sample indicates the formation of the tetragonal ZrCuSiAs-type SmFeAsO0.8F0.2 with lattice parameters a=3.932 Å and c=8.490 Å. The electrical transport study shows that the sample has a rather high transition temperature Tc of about 52 K, and magnetic field effect on the resistance reveals a rather high upper critical field HC2 of about 65 T.

Polymerization and phase diagram of solid C70 after high-pressure-high-temperature treatment

1998 ◽  
Vol 248 (5-6) ◽  
pp. 415-422 ◽  
Author(s):  
V.D. Blank ◽  
N.R. Serebryanaya ◽  
G.A. Dubitsky ◽  
S.G. Buga ◽  
V.N. Denisov ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Pressure ◽  
High Temperature ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
High Pressure High Temperature

Physical properties of superhard and ultrahard fullerites created from solid C 60 by high-pressure-high-temperature treatment

1997 ◽  
Vol 64 (3) ◽  
pp. 247-250 ◽  
Author(s):  
V.D. Blank ◽  
S.G. Buga ◽  
N.R. Serebryanaya ◽  
G.A. Dubitsky ◽  
R.H. Bagramov ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Physical Properties ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
High Pressure High Temperature

Hochdruckmodifikationen der Lanthaniden(III)sulfide Ln2S3 (Ln = Lu-Ho, Y) mit U2S3-Struktur / High Pressure Modifications of the Rare Earth Sulfides Ln2S3 (Ln = Lu-Ho, Y) with U2S3-Structure

1975 ◽  
Vol 30 (11-12) ◽  
pp. 889-895 ◽  
Author(s):  
Klaus-Jürgen Range ◽  
Richard Leeb
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
Temperature Treatment ◽  
The Other ◽  
High Temperature Treatment ◽  
Ambient Conditions ◽  
High Pressure High Temperature ◽  
Trigonal Prismatic ◽  
The Rare Earth

New modifications of the rare-earth sesquisulfides Ln2S3 (Ln = Lu-Ho, Y) were found after high pressure, high temperature treatment and quenching to ambient conditions. The crystal structure of the prototype Tm2S3-III was determined from singlecrystal data. Tm2S3-III and the other members of the isotypic series Ln2S3-III are isostructural with U2S3. Some relations between the U2S3 structure and other structures with trigonal prismatic anion configurations are discussed.

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