Effects of defects on the quantum efficiency of Eu2+ -doped aluminates with the magnetoplumbite-type crystal structure

1976 ◽  
Vol 14 (2) ◽  
pp. 147-152 ◽  
Author(s):  
A.L.N. Stevels ◽  
A.D.M. Schrama-de Pauw
Keyword(s):  
Crystal Structure ◽  
Quantum Efficiency ◽  
Type Crystal

scholarly journals Ge0.57Ti0.43O2: a new high-pressure material with rutile-type crystal structure

2018 ◽  
Vol 74 (7) ◽  
pp. 1010-1012 ◽  
Author(s):  
Emil Stoyanov ◽  
Kurt Leinenweber ◽  
Thomas L. Groy ◽  
Abds-Sami Malik
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
High Pressure ◽  
Single Crystals ◽  
Structure Type ◽  
Site Symmetry ◽  
Rutile Structure ◽  
High Pressure And Temperature ◽  
Atom Position ◽  
Type Crystal

Single crystals of a GeO2–TiO2 solid solution with the corresponding composition Ge0.57Ti0.43O2 (germanium titanium tetraoxide) were obtained by devitrification of germania-titania glass at high pressure and temperature. The new compound crystallizes in the rutile structure type (space group P42/mnm), where Ge and Ti share the same position M (site symmetry m.mm), with occupancy values of 0.57 (3) and 0.43 (3), respectively, and one O-atom position (m.2m). The M site is in a sixfold O-atom coordination and, as in the original TiO2 rutile structure, an elongation of the O—M—O bonds along the c-axis direction of the coordination polyhedron and deviation of the angles from 90° lead to a decrease in the coordination symmetry from octahedral to tetragonal. The Ge and Ti atoms are fully disordered in the structure, which indicates that the rutile structure is surprisingly pliant given the differing sizes of the two cations.

U(Ni1−xGax)5 novel compounds with CaCu5-type: crystal structure and magnetism

1995 ◽  
Vol 139 (1-2) ◽  
pp. 23-32 ◽  
Author(s):  
A. Zelinsky ◽  
Yu.N. Grin ◽  
K. Hiebl ◽  
P. Rogl ◽  
H. Noël ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Type Crystal

scholarly journals Electric Conduction of MgCr2O4 with Spinel Type Crystal Structure.

1999 ◽  
Vol 107 (1246) ◽  
pp. 541-545 ◽  
Author(s):  
Hiroki MORIWAKE ◽  
Takuoki HATA ◽  
Masaaki KATSUMATA ◽  
Masayuki TAKAHASHI ◽  
Isao SHIMONO
Keyword(s):  
Crystal Structure ◽  
Electric Conduction ◽  
Spinel Type ◽  
Type Crystal

Magnetic arrangements in uranium compounds with UGeTe-type crystal structure

1974 ◽  
Vol 25 (2) ◽  
pp. 637-644 ◽  
Author(s):  
J. Lorenc ◽  
J. Przystawa ◽  
A. Zygmunt
Keyword(s):  
Crystal Structure ◽  
Uranium Compounds ◽  
Type Crystal
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