T. O. Brun

Los Alamos National Laboratory

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J. S. Kouvel

University of Illinois Chicago

S. Susman

Argonne National Laboratory

G. H. Lander

Joint Research Centre

G. H. Lander

University of Bristol

Liwen Liu

Open University of China

K. J. Volin

Argonne National Laboratory

M. Said

Yarmouk University

L.A. Curtiss

Argonne National Laboratory

M. H. Mueller

Argonne National Laboratory

J. A. Gotaas

University of Central Lancashire

Cooperative Institutions

Argonne National Laboratory

Los Alamos National Laboratory

Oak Ridge National Laboratory

University of Illinois Urbana-Champaign

National Institute of Standards and Technology

Northwestern University

Brookhaven National Laboratory

Iowa State University

University of Illinois Chicago

United States Department of Energy

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Time-gated energy-selected cold neutron radiography

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1999)

Thomas E. McDonald T. O. Brun T.N. Claytor E.H. Farnum G. L. Greene

Neutron Imaging

10.1016/s0168-9002(98)01252-2

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Citations (20)

POLARIZATION EFFECTS IN NEUTRON SCATTERING FROM SPIRAL DOMAINS IN MnP

Le Journal de Physique Colloques (1971)

G. P. Felcher G. H. Lander T. O. Brun

10.1051/jphyscol:19711199

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Citations (5)

Field-induced transitions in DySb

T. O. Brun G. H. Lander F.W. Korty J. S. Kouvel

The NaCl‐structured compound DySb, which in zero field transforms abruptly at TN?9.5 K to a Type‐II antiferromagnetic (A) state with a nearly tetragonal lattice distortion, was previously found to exhibit rapid field‐induced changes in magnetization at 1.5 K. The field‐induced transitions in a DySb crystal have been studied by neutron diffraction and magnetization measurements in fields up to ∠60 kOe applied parallel to each of the principal axes. In the 〈100〉 case, the transition from the A toan intermediate ferrimagnetic (Q) state is first‐order at 4.2 K (critical field Hc?21 kOe) but is continuous from ∠6 K up to TN, as Hc→O. The Q‐to‐paramagnetic (P) transition is rapid but continuous at 4.2 K (Hc?40 kOe) and becomes broad as TN is approached. In the 〈110〉 case the A‐to‐Q transition remains essentially first‐order from 4.2 K (Hc?15 kOe) up to TN; above TN rapid P‐to‐Q transitions occur at very high fields. The magnetic structure of the Q state is found to be that of HoP.

Tetragonal crystal system

Ferrimagnetism

Critical field

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Proton density modulation of D atoms in PdD_1-x

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1979)

M. H. Mueller T. O. Brun R. L. Hitterman H. W. Knott C. B. Satterthwaite

Recent resistivity and neutron diffraction measurements have provided evidence for ordering of D(H) atoms on the octahedral interstitial sites of PdD/sub 1-x/. This order--disorder transition is responsible for the 50 K anomaly which has been reported in many of the physical properties. Neutron diffraction measurements on a PdD/sub 0/ /sub 76/ single crystal revealed satellite reflection at (4/5,2/5,0) and equivalent positions. These satellites can be accounted for by a multi-domained tetragonal unit cell with a/sub t/ = a/sub c/ root 5/2 and c/sub t/ = c/sub a/. This ordered state can be described as a deuteron density wave along a cubic direction. This density is modulated such that four fully occupied planes (Pd and D) are followed by a vacant plane (Pd only).

Modulation (music)

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Magnetic form factor of thulium and terbium metals

T. O. Brun

Terbium

Thulium

Factor (programming language)

10.31274/rtd-180815-4903

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Small-angle neutron scattering studies of the template-mediated crystallization of ZSM-5 type zeolite

Lennox E. Iton T. O. Brun J. E. Epperson F. Trouw John W. White

Small-angle neutron scattering is a useful new approach to the study of zeolite crystallization from aluminosilicate gels and the action of template molecules. It has been applied to gels for synthesis of zeolite ZSM-5 using tetrapropylammonium ions as templates where the scattering length densities of the gel particles and their texture were determined using contrast variation methods. Gels formulated from soluble silicate incorporate template molecules promptly into an amorphous embryonic'' structure and crystallization ensues via a solid hydrogel transformation mechanism. Gels formulated from colloidal silica show different scattering behavior, and a liquid phase transport mechanism is inferred. 8 refs., 4 figs., 2 tabs.

Small-angle X-ray scattering

10.2172/7109064

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Chemical Spectroscopy

Juergen Eckert T. O. Brun A.J. Dianoux Jonathon Howard J. J. Rush

10.1201/b17954-8

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Citations (12)

Raman scattering from high-Tcsuperconductors

Physical review. B, Condensed matter (1988)

R. Bhadra T. O. Brun Mark A. Beno B. Da̧browski D. G. Hinks

Raman scattering experiments from high-${T}_{c}$ superconductors of the R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{d}}$ type, with R=Y, Pr, Nd, Eu, Gd, Dy, and Yb, are reported. Because of the great difficulty in obtaining single-phase samples, spectra from all starting compounds and other known phases of Y-Ba-Cu are presented. This systematic approach has allowed the identification of the lines observed in Raman spectra of the superconducting compounds as well as those of impurity phases. The lines originating from the superconducting yttrium compound were investigated as a function of quench temperature, and oxygen deficiency. Polarization studies on single crystals are also presented.

10.1103/physrevb.37.5142

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Citations (72)

MAGNETIC STRUCTURE OF CUBIC Tb_0.3Y_0.7Ag

Le Journal de Physique Colloques (1988)

J. A. Gotaas M. Said J. S. Kouvel T. O. Brun

Cubic crystal system

10.1051/jphyscol:19888506

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Spectra and pulse shapes of a decoupled liquid hydrogen moderator

T. O. Brun

The neutron leakage current and time distributions have been determined experimentally for the decoupled liquid para-hydrogen moderator installed at the LANSCE pulsed spallation neutron source. The current measurements were performed using an ORDELA Neutron Beam Monitor (Model 4100N). The time distribution was measured with a time focused diffractometer using 'perfect' single crystals of silicon. In this report, a short discussion of the ortho-para hydrogen problem and an estimate of the ortho-para concentration in the circulating liquid hydrogen loop will be presented. This will be followed by a discussion of the neutron scattering cross sections and the empirical model used to fit the data. The results for the neutron leakage and the time distributions will be presented. (auth)

Neutron moderator

Spallation Neutron Source

Leakage (economics)

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