The Crystal Structure of Potassium Nickel Arsenate; KNiAsO4

1988 ◽  
Vol 43 (8) ◽  
pp. 1053-1055 ◽  
Author(s):  
A. M. Buckley ◽  
S. T. Bramwell ◽  
P. Day ◽  
W. T. A. Harrison
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Unit Cell ◽  
Hexagonal Cell ◽  
Space Group ◽  
Powder Neutron Diffraction

AbstractThe crystal structure of potassium nickel arsenate. KNiAsO4 has been determined by high resolution powder neutron diffraction at 30 K. The unit cell of KNiAsO4 is rhombohedral. space group R3̄, with hexagonal cell constants, a = 4.97208(2) (Å). c = 28.52606(10) (Å). The compound is isomorphous with NaNiAsO4.

The crystal structure of KCaF3 at 4.2 and 300 K: A re-evaluation using high-resolution powder neutron diffraction

2005 ◽  
Vol 20 (1) ◽  
pp. 7-13 ◽  
Author(s):  
K. S. Knight ◽  
C. N. W. Darlington ◽  
I. G. Wood
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Perovskite Phase ◽  
Lattice Parameters ◽  
Monoclinic Space Group ◽  
Space Group ◽  
Powder Neutron Diffraction

The crystal structure of the perovskite phase KCaF3 has been redetermined at 4.2 and 300 K using powder neutron diffraction collected at the highest resolution. At both temperatures the phase was found to be orthorhombic in space group Pnma, with lattice parameters a=0.622 879(5) nm, b=0.870 031(7) nm, c=0.611 210(5) nm at 4.2 K, and a=0.621 488(6) nm, b=0.876 360(8) nm, c=0.616 481(6) nm at 300 K. The CaF6 octahedron is regular at both temperatures with octahedral rotations of 9.6° and 13.2° for the in-phase and anti-phase tilts, respectively, at 4.2 K. No evidence was found to support the recent revision of the space group from Pnma to the monoclinic space group B21∕m.

Problems of studying the crystal structure of Ce1−xLax11B6 solid solutions by high-resolution powder neutron diffraction

1991 ◽  
Vol 24 (2) ◽  
pp. 142-145 ◽  
Author(s):  
V. A. Trunov ◽  
A. L. Malyshev ◽  
D. Yu. Chernyshov ◽  
A. I. Kurbakov ◽  
M. M. Korsukova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Solid Solutions ◽  
Powder Neutron Diffraction

THE CRYSTAL STRUCTURE OF Bi2Te2Se

1961 ◽  
Vol 39 (7) ◽  
pp. 1040-1043 ◽  
Author(s):  
J. A. Bland ◽  
S. J. Basinski
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Unit Cell ◽  
Hexagonal Cell ◽  
Space Group ◽  
X Ray ◽  
Contact Distance

The crystal structure of Bi2Te2Se has been determined by X-ray single crystal methods. The unit cell is trigonal, space group [Formula: see text] with hexagonal cell edges a = 4.28 ± 0.02 Å, c = 29.86 ± 0.10 Å, and there are three formula units per unit cell. The structure is of the C33 type and a comparison is made with other C33 structures, Bi2Se3, Bi2Te3, and Bi2Te2S. An important common feature of these compounds is that the atom on the center of symmetry has a relatively large contact distance with each of its six Bi neighbors.

The crystal structure of CBrF3by high-resolution powder neutron diffraction

1992 ◽  
Vol 77 (1) ◽  
pp. 45-50 ◽  
Author(s):  
A. Jouanneaux ◽  
A.N. Fitch ◽  
J.K. Cockcroft
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Powder Neutron Diffraction

scholarly journals Symmetry analysis of complex magnetic structure in monoclinically distorted Er3Cu4Sn4

2021 ◽  
Vol 77 (2) ◽  
pp. 219-224
Author(s):  
Stanisław Baran ◽  
Aleksandra Deptuch ◽  
Bogusław Penc ◽  
Andreas Hoser ◽  
Andrzej Szytuła
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Low Temperatures ◽  
Magnetic Moments ◽  
Symmetry Analysis ◽  
Monoclinic Space Group ◽  
Modulated Structure ◽  
Powder Neutron Diffraction

The magnetic structure in Er3Cu4Sn4 has been determined using high-resolution powder neutron diffraction, supported by symmetry analysis. At low temperatures, Er3Cu4Sn4 assumes a crystal structure of the Tm3Cu4Sn4 type (in the monoclinic space group C2/m). The Er atoms occupy two distinct Wyckoff sites: 2c and 4i. It has been found that the Er magnetic moments on the 2c site form a commensurate antiferromagnetic structure (k 1 = [0, 0, ½]) below 6 K. The magnetic moments reach 8.91 (8) μB at 1.4 K and are parallel to the b axis. The Er magnetic moments on the 4i site order below 2 K and form an incommensurate antiferromagnetic sine-modulated structure (k 2 = [1, 0.4667 (1), ½]), with magnetic moments lying in the ac plane and perpendicular to the a axis. The amplitude of modulation equals 8.7 (1) μB at 1.4 K.

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