The determination of hyperfine interaction fields in neutron irradiated cobalt by nuclear orientation techniques

1967 ◽  
Vol 296 (1444) ◽  
pp. 71-81
Keyword(s):  
Excited State ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Hyperfine Field ◽  
Thermal Neutron ◽  
Nuclear Orientation ◽  
Cobalt Atom ◽  
Interaction Field ◽  
Thermal Neutron Irradiation

The hyperfine interaction field on 60 Co nuclei formed by thermal neutron irradiation of a single crystal of hexagonal cobalt at 4°K was determined from measurements of the anisotropy of γ -radiation emitted when the sample was cooled to about 0·012°K. These measurements were repeated after the sample had been annealed successively at 20, 77 and at 300°K. A reduction of (6 ± 4) % in the hyperfine field on the 60 Co nuclei was observed after annealing out the radiation damage. This result is discussed in terms of the positions in the lattice which might be occupied by a cobalt atom after the recoil caused by the γ -decay of the 8 MeV excited state of a 60 Co nucleus immediately after its formation.

Measurements of Quadrupole Interactions by Nuclear Orientation and Quadrupole-Interaction-Resolved NMR on Oriented Nuclei

1986 ◽  
Vol 41 (1-2) ◽  
pp. 95-98 ◽  
Author(s):  
K.-H. Ebeling ◽  
R. Eder ◽  
E. Hagn ◽  
E. Zech ◽  
M. Deicher
Keyword(s):  
Electric Field ◽  
Single Crystal ◽  
Electric Field Gradient ◽  
Single Crystals ◽  
Quadrupole Interaction ◽  
Nuclear Orientation ◽  
Hyperfine Fields ◽  
Host Matrix ◽  
Quadrupole Interactions

The techniques of quadrupole-interaction nuclear-orientation and quadrupole-interaction-resolvedNMR on oriented nuclei were applied to radioactive 111In (T1/2 = 2.8 d), 198Au(T1/2= 2.7 d) and 199Au (T1/2 = 3.1 d), mass-separator-implanted into single crystals of hep Coand hep Gd. For 111InGd the quadrupole interaction was observed via the broadening of theresonance and the dependence of the effective quadrupole interaction on the angle θbetween thec-axis of the single crystal and the direction of magnetization. For 198AuGd the large electric fieldgradient known from the literature could not be confirmed. For 198AuCo and 199AuCo thequadrupole substructure has been resolved, and the electric field gradient of Au in hep Co was determined to be -0.84(4) x 1017V/cm2. The magnetic hyperfine fields of Au in hep and fee Codiffer by about 20%. These experiments have shown that hep Co may be a good host matrix forthe determination of the quadrupole interaction of heavy radioactive nuclei with resonanceprecision.

ChemInform Abstract: Thermal Neutron Irradiation Experiments on 10BP Single-Crystal Wafers.

ChemInform ◽  
1988 ◽  
Vol 19 (50) ◽  
Author(s):  
Y. KUMASHIRO ◽  
K. KUDO ◽  
K. MATSUMOTO ◽  
Y. OKADA ◽  
T. KOSHIRO
Keyword(s):  
Single Crystal ◽  
Thermal Neutron ◽  
Neutron Irradiation ◽  
Thermal Neutron Irradiation

Thermal neutron irradiation experiments on 10BP single-crystal wafers

1988 ◽  
Vol 143 (1-2) ◽  
pp. 71-75 ◽  
Author(s):  
Y Kumashiro ◽  
K Kudo ◽  
K Matsumoto ◽  
Y Okada ◽  
T Koshiro
Keyword(s):  
Single Crystal ◽  
Thermal Neutron ◽  
Neutron Irradiation ◽  
Thermal Neutron Irradiation

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

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