W.B. Yelon

Missouri University of Science and Technology

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W. J. James

Schott (Germany)

S. K. Malik

Universidade Federal do Rio Grande do Norte

V. P. S. Awana

CSIR National Physical Laboratory of India

H. Yamauchi

International Superconductivity Technology Center

Cyrus E. Crowder

Dow Chemical (United States)

G. K. Marasinghe

University of North Dakota

Maarit Karppinen

Aalto University

Shi Xue Dou

University of Wollongong

K.H.J. Buschow

University of Amsterdam

R. Nirmala

Indian Institute of Technology Madras

Cooperative Institutions

University of Missouri

Missouri University of Science and Technology

Indian Institute of Technology Madras

Lomonosov Moscow State University

Centre National de la Recherche Scientifique

The Graduate Center, CUNY

Indian Institute of Science Bangalore

Tata Institute of Fundamental Research

Chinese Academy of Sciences

Oak Ridge National Laboratory

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Neutron structural studies on the superconducting (Nd1−xCax)(Ba1.6La0.4)Cu3Oz system

Journal of Applied Physics (2009)

Amish G. Joshi R.G. Kulkarni W.B. Yelon Ram Prasad M. R. Gonal

We have investigated the influence of Ca ion substitution on the structural and superconducting properties of (Nd1−xCax)(Ba1.6La0.4)Cu3Oz system. Magnetization, x-ray diffraction, and neutron diffraction studies have been carried out on a series of compounds with x=0.0–0.6. The superconducting transition temperature Tc, determined from magnetization measurements, increases with increasing Ca2+ substitution. Neutron diffraction studies reveal that these compounds crystallize in a tetragonal structure (space group P4∕mmm). A detailed analysis of the neutron diffraction data reveals that Ca and La ions are intermixed at the nominal Ba and Nd sites. While a major fraction of Ca ions occupy the usual Nd site, a small fraction occupies the Ba site. Consequently, the corresponding amount of La substitutes at the nominal Nd site. The intermixing of Ca and La sites randomizes the chain site oxygens leading to a tetragonal structure despite an oxygen content close to 7.0 for all the Ca doped samples. Further increase in Ca content leads to change in its coordination from sixfold to eightfold at x⩾0.4.

Tetragonal crystal system

10.1063/1.3116532

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Citations (1)

A powder neutron diffraction study of the LaNi4.5Al0.5D4.5 structure at 298 and 77 °K

Journal of Applied Physics (1982)

Cyrus E. Crowder W. J. James W.B. Yelon

Recently, there has been some controversy over the structure of hydrides of the La(Ni5−xAlx)5 system. One of the proposed structures belongs to the P6/mmm space group and contains five deuterium sites.4,5 The other proposed structure belongs to the P31m space group and contains two deuterium sites.6 In an attempt to resolve this conflict, a powder neutron diffraction study has been carried out for LaNi4.5Al0.5D4.5 at 298 and 77 °K. A modified Rietveld profile analysis technique was used to interpret the data. It is found that a two-site model using P6/mmm symmetry adequately describes the structure at 298 °K. At 77 °K, there is no evidence of magnetic ordering and the structure shows only slight changes from that given at 298 °K. The lattice parameter a contracts from 5.341 to 5.331 Å, while c remains constant at 4.236 Å.

Rietveld Refinement

Lattice constant

Magnetic structure

Space group

Powder Diffraction

10.1063/1.330922

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Citations (27)

Structure determination of CaMnO3 and CaMnO2.5 by X-ray and neutron methods

Journal of Solid State Chemistry (1982)

Kenneth R. Poeppelmeier M. E. Leonowicz Joseph C. Scanlon John M. Longo W.B. Yelon

Orthorhombic crystal system

Distortion (music)

10.1016/0022-4596(82)90292-4

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Citations (346)

Magnetic Ordering in Ba 2 DyRuO 6

APS March Meeting Abstracts (2009)

Jagat Lamsal W.B. Yelon Howard A. Blackstead M. P. Smylie Qing Cai

Source

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Evidence for the Noncollinearity of the Magnetic Structure of Er6Mn23

Springer eBooks (1982)

B. Kebe Cyrus E. Crowder W. J. James J. Déportes R. Lemaire

Ferrimagnetism

Antiparallel (mathematics)

Magnetic structure

10.1007/978-1-4613-3406-4_80

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Citations (2)

A neutron diffraction study of the atomic ordering in Er(Fe1 − xCox)3

Journal of the Less Common Metals (1989)

Dwayne E. Tharp O. A. Pringle W.J. James G. K. Marasinghe Gary J. Long

Magnetic structure

Curie

10.1016/0022-5088(89)90513-4

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Citations (3)

Neutron powder diffraction study and physical characterization of MSr_(2)YCu_(2)O_(z) (M-1212) compounds with M = Fe,Co,Al, and Ga

V. P. S. Awana S. K. Malik W.B. Yelon H. Yamauchi M. Karppinen

Characterization

Powder Diffraction

Source

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ChemInform Abstract: Magnetic Properties of Tb2Mn17Cx Compounds Studied by Magnetic Measurements and Neutron Diffraction.

ChemInform (1997)

Zijia Hu Huiqian Luo W.B. Yelon C.H. de Groot F.R. de Boer

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.199734008

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Neutron diffraction study on magnetic properties of anhydrous gadolinium trichloride

Journal of Physics C Solid State Physics (1976)

J. Kötzler W. Scheithe K. Knorr W.B. Yelon

Elastic neutron scattering from a single crystal of hexagonal 160GdCl3 was measured at liquid helium temperatures with neutron wavelengths of 1.45 and 2.36 AA. Large extinction was observed and analysed in terms of a recent theory developed by Becker and Coppens (1974-75). The strongest reflections were reduced by primary and secondary extinction by 2 and 80 per cent respectively. From magnetic Bragg intensities ((101) and (112)) in the temperature range 0.002

Spontaneous magnetization

10.1088/0022-3719/9/7/020

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Citations (7)

A cryostat for four-cycle neutron diffraction

Journal of Physics E Scientific Instruments (1976)

G. Claudet A. Tippe W.B. Yelon

A novel gas flow cryostat for four-circle neutron diffraction is described. The system permits measurements at temperatures between 8 and 300K and has successfully been in use at the ILL for several years. The results of some of the experiments performed with the system are also given.

Cryostat

10.1088/0022-3735/9/4/005

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