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AbstractAbstract
No abstract available
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Journal Article
Journal
Physical Review. A; v. 6(6); p. 2057-2058
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AbstractAbstract
No abstract available
Source
7. symposium on Moessbauer effect methodology; New York, N. Y; 31 Jan 1971
Record Type
Journal Article
Literature Type
Conference
Journal
Moessbauer Effect Methodology, Proceedings of the Symposium; v. 7 p. 123-145
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INIS VolumeINIS Volume
INIS IssueINIS Issue
Dunlap, B.D.
Argonne National Lab., Ill. (USA)1976
Argonne National Lab., Ill. (USA)1976
AbstractAbstract
[en] In the last few years, considerable advances have been made in our understanding of the properties of the light actinides. Although these are 5f transition elements formally equivalent to the lanthanide (4f) elements, these materials show a much more varied behavior due to the larger spatial extent and ionizability of the 5f electrons. A review is given of some areas of current interest, especially where hyperfine measurements have played an active role. These include studies of a variety of magnetic phenomena, systematics of isomer shift measurements, and studies of paramagnetic relaxation
Original Title
Review, hyperfine measurements, magnetic phenomena, isomer shift, paramagnetic relaxation
Primary Subject
Secondary Subject
Source
1976; 37 p; International conference on the applications of the Mossbauer effect; Corfu, Greece; 13 Sep 1976; Available from NTIS. $4.00.
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Shenoy, G.K.; Dunlap, B.D.
Argonne National Lab., Ill. (USA)1977
Argonne National Lab., Ill. (USA)1977
AbstractAbstract
[en] Theoretical development in the line shape calculation of Mossbauer resonance spectra involving spin relaxation effects is introduced. The ''eigenvalue'' procedure of calculating line shapes saves computational times by two orders of magnitude compared to traditional methods. This was illustrated by calculating the relaxation spectra of hemoglobin cyanide and a GAMMA8 quartet electronic state. The ''white noise approximation'' involved in all the relaxation theory is discussed, and its limitations are pointed out. The theory without such an approximation is used to analyze the data for Cs2NaYbCl6
Original Title
White noise approximation
Primary Subject
Source
1977; 17 p; Nassau Mossbauer conference; Garden City, New York, United States of America (USA); 18 - 19 Nov 1976; Available from NTIS. $3.50
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ALKALI METAL COMPOUNDS, CARBOXYLIC ACIDS, CESIUM COMPOUNDS, CHLORIDES, CHLORINE COMPOUNDS, EVEN-ODD NUCLEI, HALIDES, HALOGEN COMPOUNDS, HETEROCYCLIC ACIDS, HETEROCYCLIC COMPOUNDS, INTERMEDIATE MASS NUCLEI, IRON ISOTOPES, ISOTOPES, NUCLEI, ORGANIC ACIDS, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, PIGMENTS, PORPHYRINS, PROTEINS, RARE EARTH COMPOUNDS, RELAXATION, SODIUM COMPOUNDS, SPECTRA, STABLE ISOTOPES, YTTERBIUM COMPOUNDS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Fedro, A.J.; Dunlap, B.D.
Argonne National Lab., IL (USA); Northern Illinois Univ., De Kalb (USA)1985
Argonne National Lab., IL (USA); Northern Illinois Univ., De Kalb (USA)1985
AbstractAbstract
[en] Using the Mori formalism, a general theory is developed for the calculation of paramagnetic relaxation effects in a general crystal field doublet. For systems with extreme magnetic anisotropy, the relaxation rates show a strong angular dependence, being severely peaked in a direction perpendicular to the magnetic easy axis. Application to the RRh4B4 (R = rare-earth) compounds is discussed. 5 refs
Primary Subject
Source
1985; 10 p; International conference on magnetism; San Francisco, CA (USA); 26-30 Aug 1985; Available from NTIS, PC A02/MF A01 as DE85014992
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Dunlap, B.D.; Shenoy, G.K.
Argonne National Lab., IL (USA)1980
Argonne National Lab., IL (USA)1980
AbstractAbstract
[en] Until recently it has been commonly accepted that small impurities of magnetic atoms were severely detrimental to superconductivity, and that superconductivity and long-range magnetic ordering could not occur in the same materials. In known binary and pseudo-binary compounds, this is still the case. However, many recent experiments on ternary superconductors have shown that the effects of magnetism are considerably more complex. In some cases, the addition of magnetic atoms has been found to enhance superconducting properties by increasing the superconducting critical field, without significantly lowering the transition temperature. In many cases, compounds will show both superconducting and long range magnetic ordering transitions. The destruction of superconductivity by ferromagnetic ordering and the coexistence of superconductivity with antiferromagnetic ordering is now well established. Hyperfine interaction measurements have played a significant role in the investigations of these materials, including measurement of the magnitude of the exchange interaction between rare-earth spin and conduction electron spin, elucidation of the mechanism for critical field enhancement, specification of crystalline field ground states, and studies of the nature of magnetic ordering
Primary Subject
Source
1980; 10 p; 5. international conference on hyperfine interactions; Berlin, F.R. Germany; 21 - 25 Jul 1980; Available from NTIS., PC A02/MF A01
Record Type
Report
Literature Type
Conference; Numerical Data
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Capone, D.W.; Dunlap, B.D.; Veal, B.W.
Arch Development Corp., Argonne, IL (United States)1990
Arch Development Corp., Argonne, IL (United States)1990
AbstractAbstract
[en] A superconductor comprised of a polycrystalline metal oxide such as YBa2Cu3O7-X (where 0 < X < 0.5) exhibits superconducting properties and is capable of conducting very large current densities. By aligning the two-dimensional Cu-O layers which carry the current in the superconducting state in the a- and b-directions, i.e., within the basal plane, a high degree of crystalline axes alignment is provided between adjacent grains permitting the conduction of high current densities. The highly anisotropic diamagnetic susceptibility of the polycrystalline metal oxide material permits the use of an applied magnetic field to orient the individual crystals when in the superconducting state to substantially increase current transport between adjacent grains. In another embodiment, the anisotropic paramagnetic susceptibility of rare-earth ions substituted into the oxide material is made use of as an applied magnetic field orients the particles in a preferential direction. This latter operation can be performed with the material in the normal (non-superconducting) state. 4 figs
Primary Subject
Secondary Subject
Source
17 Jul 1990; 28 Sep 1987; [10 p.]; US PATENT DOCUMENT 4,942,151/A/; US PATENT APPLICATION 7-101,820; Available from Patent and Trademark Office, Box 9, Washington, DC 20232 (United States); Application date: 28 Sep 1987
Record Type
Patent
Country of publication
ALKALINE EARTH METAL COMPOUNDS, BARIUM COMPOUNDS, CHALCOGENIDES, COPPER COMPOUNDS, CRYSTAL STRUCTURE, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, MAGNETIC PROPERTIES, MICROSTRUCTURE, ORIENTATION, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, SUPERCONDUCTORS, TRANSITION ELEMENT COMPOUNDS, YTTRIUM COMPOUNDS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Aldred, A.T.; Dunlap, B.D.; Lander, G.H.
Argonne National Lab., Ill. (USA)1976
Argonne National Lab., Ill. (USA)1976
AbstractAbstract
[en] This paper reviews recent high-field (up to 80 kOe) magnetization, nuclear-gamma-ray resonance, and neutron diffraction measurements on a number of actinide ferromagnets with the C-15 Laves phase crystal structure. NpAl2 and NpOs2 are an interesting contrast; NpAl2 behaves as a localized 5f system whereas NpOs2 exhibits properties usually associated with itinerant ferromagnets. The second part of the paper reports similar measurements on the series AnFe2, where An = U, Np, Pu, and Am. The properties of these compounds suggest an increasing localization of 5f electrons as one proceeds from uranium to americium. The Pu ion in PuFe2 is definitely trivalent 5f5, but the observation of a small negative moment on the Am site in AmFe2 implies a partial occupancy of the Am2+ 5f7 state in this compound. This is the first indication of a mixed valence configuration in an actinide system
Primary Subject
Source
1976; 10 p; 2. international conference on the electronic structures on the actinides; Wroclaw, Poland; 13 Sep 1976; Available from NTIS. $3.50.
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Record Type
Journal Article
Journal
Physical Review Letters; v. 28(9); p. 530-533
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Friedt, J.M.; Shenoy, G.K.; Dunlap, B.D.
Argonne National Lab., IL (USA)1978
Argonne National Lab., IL (USA)1978
AbstractAbstract
[en] The electric quadrupole and magnetic hyperfine interactions measured from the 161Dy Moessbauer resonance in crystalline Dy(OH)3 and from the 166Er resonance in crystalline Ho(OH)3 and Er(OH)3 are interpreted using the crystal field and molecular exchange field model. The crystal field parameters established from previous optical spectroscopy results account well for these hyperfine parameters. The crystal-field and magnetic properties of these ferromagnetic insulators are described well within the model
Primary Subject
Source
1978; 14 p; Conference on the applications of the Moessbauer effect; Kyoto, Japan; 28 Aug - 1 Sep 1978; Available from NTIS., PC A02/MF A01
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
DYSPROSIUM COMPOUNDS, DYSPROSIUM ISOTOPES, ERBIUM COMPOUNDS, ERBIUM ISOTOPES, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, HOLMIUM COMPOUNDS, HYDROGEN COMPOUNDS, HYDROXIDES, INTERMEDIATE MASS NUCLEI, ISOTOPES, NUCLEI, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, RARE EARTH COMPOUNDS, RARE EARTH NUCLEI, STABLE ISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
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