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An electron microscopic investigation of the decomposition of V2O5
iv 10.
ABSTRACTS OF PAPERS TO APPEAR IN LATTICE DISTORTION, SPECIFIC HEAT, AND ANTIFERROMAGNETIC ORDERING IN AuMn D.C. Finbow, Physics Dept., University of Salford, England, P. Makhurane, Physics Dept., University of Zambia, Lusaka, Zambia and P. Gaunt, Physics
J.
PHYS. CHEM. SOLIDS
Vol. 7, No. 15
displays a sharp maximum there. It is also shown that due to the special symmetry of the lattice, a uniform uniaxial strain can open up a gap at the center of several of the bands of the linear chains, and this effect may also lead to a lattice instability. Received 16 May 1969
Dept., University of Manitoba, Canada
Experiments are reported which show that the tetragonal distortion in an AuMn alloy below the Néel temperature depends on the square of
12.
the antiferromagnetic order parameter. This result is shown to be consistent with a distortion dependent magnetic exchange energy.
R.J.D. Tilley and B.G. Hyde, School of Chemistry, the University of Western
Australia, Nedlands, Western Australia, 6009
The specific heat of an AuMn alloy has been
measured in the range 100—600°K and the magnetic part of the specific heat curve agrees in detail with the predictions of a distortion modified molecular field model with S = 2.
Received 12 March 1969
AN ELECTRON MICROSCOPIC INVESTIGATION OF THE DECOMPOSITION OF V2 05
The decomposition of vanadium pentoxide at temperatures up to 400°C in vacuum has been investigated using transmission electron microscopy. A number of new phases has been found,
two of which may be ordered super-lattices of anion vacancies in vanadium pentoxide. No evidence of crystallographic shear was observed.
11.
SOME CONSIDERATIONS REGARDING THE APPLICATION OF A LINEAR
Received 21 March 1969 Revised 21 May 1969
CHAIN MODEL TO SOME COMPOUNDS OF THE f3-W STRUCTURE M. Weger, Laboratoire de Physique des Solides Faculté des Sciences, 91, Orsay, France In A3B compounds possessing the A15 (13-W) lattice, such as V3 Si, ‘A’ atoms are arranged in families of interpenetrating linear chains. As a consequence, the electronic band structure may display one-dimensional properties. A model lattice is considered by the tight-binding approximation, and it is shown
13.
A NEW TYPE OF LONG PERIOD SUPERLATTICE WITH HEXAGONAL SYMMETRY IN Au—Cd ALLOYS M. Hirabayashi, S. Yamaguchi, K. Hiraga and N. mo, The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan and H. Sato and R.S. Toth, Scientific Laboratory, Ford Motor Company, Dearborn, Michigan
that sections of the constant energy surfaces are approximately planes, and the wave functions are concentrated on chains perpendicular to
The existence of a new type of long period superlattice having hexagonal symmetry, whose
these planes, even for quite strong interchain coupling. The symmetries of 3d states localized on atoms of a single chain are investigated, for
period is determined by the critical contact of the Brillouin zone boundaries with the Fermi surface, has been established. The ordering of
the cubic and strained states of the lattice. It
the atoms on the close packed hexagonal plane
is shown that for some bands, the interchain coupling vanishes for k = 0; for these bands, it is conceivable that the density of states
of these structures is derived from that of the A3B type (Cu3 Au type) structure, but the long period is produced in the basal plane by the
ABSTRACTS OF PAPERS TO APPEAR IN LATTICE DISTORTION, SPECIFIC HEAT, AND ANTIFERROMAGNETIC ORDERING IN AuMn D.C. Finbow, Physics Dept., University of Salford, England, P. Makhurane, Physics Dept., University of Zambia, Lusaka, Zambia and P. Gaunt, Physics
J.
PHYS. CHEM. SOLIDS
Vol. 7, No. 15
displays a sharp maximum there. It is also shown that due to the special symmetry of the lattice, a uniform uniaxial strain can open up a gap at the center of several of the bands of the linear chains, and this effect may also lead to a lattice instability. Received 16 May 1969
Dept., University of Manitoba, Canada
Experiments are reported which show that the tetragonal distortion in an AuMn alloy below the Néel temperature depends on the square of
12.
the antiferromagnetic order parameter. This result is shown to be consistent with a distortion dependent magnetic exchange energy.
R.J.D. Tilley and B.G. Hyde, School of Chemistry, the University of Western
Australia, Nedlands, Western Australia, 6009
The specific heat of an AuMn alloy has been
measured in the range 100—600°K and the magnetic part of the specific heat curve agrees in detail with the predictions of a distortion modified molecular field model with S = 2.
Received 12 March 1969
AN ELECTRON MICROSCOPIC INVESTIGATION OF THE DECOMPOSITION OF V2 05
The decomposition of vanadium pentoxide at temperatures up to 400°C in vacuum has been investigated using transmission electron microscopy. A number of new phases has been found,
two of which may be ordered super-lattices of anion vacancies in vanadium pentoxide. No evidence of crystallographic shear was observed.
11.
SOME CONSIDERATIONS REGARDING THE APPLICATION OF A LINEAR
Received 21 March 1969 Revised 21 May 1969
CHAIN MODEL TO SOME COMPOUNDS OF THE f3-W STRUCTURE M. Weger, Laboratoire de Physique des Solides Faculté des Sciences, 91, Orsay, France In A3B compounds possessing the A15 (13-W) lattice, such as V3 Si, ‘A’ atoms are arranged in families of interpenetrating linear chains. As a consequence, the electronic band structure may display one-dimensional properties. A model lattice is considered by the tight-binding approximation, and it is shown
13.
A NEW TYPE OF LONG PERIOD SUPERLATTICE WITH HEXAGONAL SYMMETRY IN Au—Cd ALLOYS M. Hirabayashi, S. Yamaguchi, K. Hiraga and N. mo, The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan and H. Sato and R.S. Toth, Scientific Laboratory, Ford Motor Company, Dearborn, Michigan
that sections of the constant energy surfaces are approximately planes, and the wave functions are concentrated on chains perpendicular to
The existence of a new type of long period superlattice having hexagonal symmetry, whose
these planes, even for quite strong interchain coupling. The symmetries of 3d states localized on atoms of a single chain are investigated, for
period is determined by the critical contact of the Brillouin zone boundaries with the Fermi surface, has been established. The ordering of
the cubic and strained states of the lattice. It
the atoms on the close packed hexagonal plane
is shown that for some bands, the interchain coupling vanishes for k = 0; for these bands, it is conceivable that the density of states
of these structures is derived from that of the A3B type (Cu3 Au type) structure, but the long period is produced in the basal plane by the