scholarly journals Barium Potassium Bismuth Oxide Synthesis and Physical Properties

1989 ◽  
Vol 156 ◽  
Author(s):  
K. C. Ott ◽  
M. F. Hundley ◽  
G. H. Kwei ◽  
M. P. Maley ◽  
M. E. McHenry ◽  
...  
Keyword(s):  
Physical Properties ◽  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Bismuth Oxide ◽  
Room Temperature ◽  
Narrow Range ◽  
Neutron Powder Diffraction ◽  
Time Dependent ◽  
Barium Potassium Bismuth Oxide ◽  
Superconducting Properties

ABSTRACTA series of compounds Ba1−xKxBiO3 have been prepared and characterized over the range of compositions ranging from x = 0.3 to 0.5. A neutron powder diffraction analysis has been carried out for the composition x = 0.4 at room temperature and at 10 K. Examination of the superconducting properties as a function of x indicates superconductivity occurs over a narrow range of compositions close to x = 0.4, with Tc of 29 K. Specific heat measurements indicate conventional electron-phonon interactions may play a role in promoting superconductivity in Ba.6K.4BiO3. Magnetization loops and examination of the time dependent magnetization indicate that Ba.6K.4BiO3 has a low value of Jc due to very weak pinning.

An investigation of the polytypical structure of Sr0.2Ba0.8CoO3–δ by neutron powder diffraction

2010 ◽  
Vol 225 (5) ◽  
Author(s):  
Cristina de la Calle ◽  
José Antonio Alonso ◽  
Ainara Aguadero ◽  
Maria Teresa Fernández-Díaz ◽  
Florence Porcher
Keyword(s):  
Crystal Structure ◽  
Thermal Treatment ◽  
Powder Diffraction ◽  
Oxygen Pressure ◽  
Room Temperature ◽  
Neutron Powder Diffraction ◽  
Slow Cooling ◽  
High Oxygen Pressure ◽  
Citrate Precursor

AbstractThe preparation and characterization of two polymorphs of the title composition are described. One hexagonal perovskite, labeled as “H”, was synthesized by thermal treatment of reactive citrate precursor at 900 °C in high oxygen pressure (20 MPa) followed by slow cooling (10 °C/min) to room temperature. This 1D-structure displays aThe evolution of the crystal structure of the 3C phase has been explored

scholarly journals The High-Temperature Transformation from 1T- to 3R-LixTiS2 (x = 0.7, 0.9) as Observed in situ with Neutron Powder Diffraction

2015 ◽  
Vol 229 (9) ◽  
Author(s):  
Dennis Wiedemann ◽  
Suliman Nakhal ◽  
Anatoliy Senyshyn ◽  
Thomas Bredow ◽  
Martin Lerch
Keyword(s):  
High Temperature ◽  
Powder Diffraction ◽  
Electrode Material ◽  
Room Temperature ◽  
Lithium Ion ◽  
Neutron Powder Diffraction ◽  
Titanium Disulfide ◽  
Temperature Transformation

AbstractLayered titanium disulfide is used as lithium-ion intercalating electrode material in batteries. The room-temperature stable trigonal 1T polymorphs of the intercalates Li

Neutron powder diffraction analysis of (Tm0.50Ca0.50)MnO3 and (Lu0.50Ca0.50)MnO3

2012 ◽  
Vol 196 ◽  
pp. 314-319 ◽  
Author(s):  
A. Martinelli ◽  
M. Ferretti ◽  
M.R. Cimberle ◽  
C. Ritter
Keyword(s):  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction

Neutron Diffraction Study on Intermetallic Er5Mg24 and Tm5Mg24

2004 ◽  
Vol 443-444 ◽  
pp. 263-266 ◽  
Author(s):  
Wolfgang Schäfer ◽  
K.H.J. Buschow
Keyword(s):  
Neutron Diffraction ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Neutron Diffraction Study ◽  
Neutron Powder Diffraction ◽  
Magnetic Exchange ◽  
Lattice Constants ◽  
Group I ◽  
Temperature Lattice ◽  
Curie Temperatures

Neutron powder diffraction on the binary intermetallics Er5Mg24 and Tm5Mg24 confirms their isostructural and pure crystallization in the Ti5Re24-type structure (space group I 4 3m, Z = 2)with rare earths located in 2a(0,0,0) and 8c(x,x,x) and Mg in two different 24g(x,y,x) sites. Room temperature lattice constants are 11.263(2) Å and 11.215(1) Å for the Er and Tm compound, respectively. Atomic positions have been refined. Both compounds order ferromagnetically below Curie temperatures of 17.5(5) K and 7.5(5) K for Er5Mg24 and Tm5Mg24, respectively. The magnitudes of the Er moments at 4.2 K are 7.5(2) µB and 4.4(2)µB on the 2a and the 8c sites, respectively. The Tm moments which have been refined from 2 K measurements amount to 3.0(3)µB and 2.8(2) µB, respectively. The temperature dependencies of the magnetic Bragg intensities reveal distinct deviations from Brillouin curves for J = 15/2 (Er) and J = 6 (Tm) systems and indicate a complex magnetic exchange.

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