Imperial College London
Alternate

ProfessorNeilAlford

Faculty of Engineering, Department of Materials

Professor of Materials
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Ms Karen Murphy +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

441 results found

PETERSON GE, STAWICKI RP, ALFORD NM, 1989, HELICAL RESONATORS CONTAINING HIGH-TC CERAMIC SUPERCONDUCTORS, APPLIED PHYSICS LETTERS, Vol: 55, Pages: 1798-1800, ISSN: 0003-6951

Journal article

KENDALL K, ALFORD NM, CLEGG WJ, BIRCHALL JDet al., 1989, FLOCCULATION CLUSTERING AND WEAKNESS OF CERAMICS, NATURE, Vol: 339, Pages: 130-132, ISSN: 0028-0836

Journal article

ALFORD NM, BIRCHALL JD, CLEGG WJ, KENDALL Ket al., 1989, CRITICAL CURRENTS OF SINTERED AND MELT-TEXTURED YBA2CU3OX, JOURNAL OF APPLIED PHYSICS, Vol: 65, Pages: 2856-2858, ISSN: 0021-8979

Journal article

CLEGG WJ, ALFORD NM, BIRCHALL JD, KENDALL Ket al., 1989, IMPROVED PROCESS FOR MAKING DENSE VITREOUS SILICA FROM SUBMICROMETER PARTICLES BY SINTERING NEAR 1000-DEGREE-C, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 72, Pages: 432-436, ISSN: 0002-7820

Journal article

GOUGH CE, KHAMAS SK, MACLEAN TSM, MEHLER MJ, ALFORD NM, HARMER MMet al., 1989, CRITICAL CURRENTS IN A HIGH-TC SUPERCONDUCTING SHORT DIPOLE ANTENNA, IEEE TRANSACTIONS ON MAGNETICS, Vol: 25, Pages: 1313-1314, ISSN: 0018-9464

Journal article

EVETTS JE, GLOWACKI BA, SAMPSON PL, BLAMIRE MG, ALFORD NMN, HARMER MAet al., 1989, RELATION OF THE N-VALUE OF THE RESISTIVE TRANSITION TO MICROSTRUCTURE AND INHOMOGENEITY FOR YBA2CU3O7 WIRES, IEEE TRANSACTIONS ON MAGNETICS, Vol: 25, Pages: 2041-2044, ISSN: 0018-9464

Journal article

KENDALL K, ALFORD NM, CLEGG WJ, BIRCHALL JDet al., 1989, ADVANCING CERAMICS THROUGH AGGLOMERATE CONTROL, 5TH INTERNATIONAL SYMP ON AGGLOMERATION, Publisher: INST CHEMICAL ENGINEERS, Pages: 355-359

Conference paper

BUTTON TW, ALFORD NM, BIRCHALL JD, WELLHOFER F, GOUGH CE, OCONNOR DAet al., 1989, A COMPARISON OF LEAD-DOPED BI-SR-CA-CU-O SUPERCONDUCTORS AT THE 2223 COMPOSITIONS AND 2234 COMPOSITIONS, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 2, Pages: 224-229, ISSN: 0953-2048

Journal article

LYON SB, LAU HL, NEWMAN RC, THOMPSON GE, HEPBURN BJ, ALFORD Net al., 1989, GALVANIC CORROSION OF Y-BA-CU-O SUPERCONDUCTORS BY GOLD AND ALUMINUM, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 2, Pages: 107-110, ISSN: 0953-2048

Journal article

RICHARDSON K, EVANS PD, EASTHAM JF, APPLETON AD, ALFORD NMet al., 1989, AN ALTERNATOR USING A HIGH-TEMPERATURE SUPERCONDUCTOR FOR FIELD EXCITATION, 4TH INTERNATIONAL CONF ON ELECTRICAL MACHINES AND DRIVES, Publisher: INST ELECTRICAL ENGINEERS, Pages: 202-204

Conference paper

KENDALL K, ALFORD NM, CLEGG WJ, BIRCHALL JDet al., 1989, HIGH-STRENGTH AND WEIBULL MODULUS FROM COLLOIDAL PROCESSING OF CERAMICS, MEETING OF THE BASIC SCIENCE SECTION AT THE 1989 ANNUAL CONVENTION OF THE INST OF CERAMICS, Publisher: INST CERAMICS, Pages: 79-87

Conference paper

POLLARD RJ, MCCARTNEY DG, ALFORD NM, BUTTON Tet al., 1989, GROWTH OF QUASI-SINGLE CRYSTAL SUPERCONDUCTING Y1BA2CU3O7-X RODS BY MELT PROCESSING, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 2, Pages: 169-172, ISSN: 0953-2048

Journal article

EAGLESHAM DJ, HUMPHREYS CJ, ALFORD NM, CLEGG WJ, HARMER MA, BIRCHALL JDet al., 1988, HIGH-TEMPERATURE SUPERCONDUCTING CERAMICS, MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, Vol: 1, Pages: 229-235, ISSN: 0921-5107

Journal article

ABELL JS, COLCLOUGH MS, FORGAN EM, GOUGH CE, MUIRHEAD CM, OCONNOR DA, VINEN WF, WELLHOFER F, BIRCHALL JD, ALFORD NM, CLEGG WJ, HARMER Met al., 1988, CRITICAL CURRENTS, MAGNETIZATION, AC-SUSCEPTIBILITY AND AC-LOSSES IN CERAMIC SUPERCONDUCTORS, PHYSICA C, Vol: 153, Pages: 359-360, ISSN: 0921-4534

Journal article

KHAMAS SK, MEHLER MJ, MACLEAN TSM, GOUGH CE, ALFORD NM, HARMER MAet al., 1988, HIGH-TC SUPERCONDUCTING SHORT DIPOLE ANTENNA, ELECTRONICS LETTERS, Vol: 24, Pages: 460-461, ISSN: 0013-5194

Journal article

ALFORD NM, CLEGG WJ, HARMER MA, BIRCHALL JD, KENDALL K, JONES DHet al., 1988, THE EFFECT OF DENSITY ON CRITICAL CURRENT AND OXYGEN STOICHIOMETRY OF YBA2CU3OX SUPERCONDUCTORS, NATURE, Vol: 332, Pages: 58-59, ISSN: 0028-0836

Journal article

ALFORD NM, KENDALL K, CLEGG WJ, BIRCHALL JDet al., 1988, STRENGTH MICROSTRUCTURE RELATION IN AL2O3 AND TIO2, ADVANCED CERAMIC MATERIALS, Vol: 3, Pages: 113-117, ISSN: 0883-5551

Journal article

ALFORD NM, BIRCHALL JD, CLEGG WJ, HARMER MA, KENDALL K, JONES DHet al., 1988, PHYSICAL AND MECHANICAL-PROPERTIES OF YBA2CU3O7-DELTA SUPERCONDUCTORS, JOURNAL OF MATERIALS SCIENCE, Vol: 23, Pages: 761-768, ISSN: 0022-2461

Journal article

Alford NMN, Clegg WJ, Harmer MA, Birchall JD, Kendall K, Jones DHet al., 1988, The effect of density on critical current and oxygen stoichiometry of YBa<inf>2</inf>Cu<inf>3</inf>O<inf>x</inf> superconductors, Nature, Vol: 332, Pages: 58-59, ISSN: 0028-0836

It has been observed that "the most important parameter of a superconductor... is the critical current density Jc" (ref. 1). In thin films or single crystals of YBa2Cu3Ox, Jc is high at ∼106A cm-2 but in bulk materials Jc is much lower, typically 102-103 A cm-2 (ref. 4). The sources of variation in Jc are important but vary. Chemical contamination such as SiO2 impurities is known to reduce Jc5 but even in the absence of such contaminants Jc varies widely. Some groups have experienced difficulty in maint-aining high (1,000 A cm-2 in bulk ceramic) current densities and sometimes even zero resistance at 77 K at high densities of the ceramic (>6.2 g cm-3). Jc is known to be anisotropic being greater in the a-b planes and least in the c-axis direction. In thin films a thirty-fold difference in Jc was reported demonstrating the anisotropy6. In bulk materials Jc has been increased to 7.5 x 103 A cm-2 by melt textured growth of the ceramic in order to induce preferred orientation7. Here we report the factors controlling Jc in sintered bulk ceramics that display no preferred orientation. We examine the relation between sintered density, oxygen content and Jc and show how Jc is strongly dependent on both the volume fraction of solid and on the oxygen stoichiometry, both being strongly influenced by the ceramic density. The problem we address is how to optimize the solid connectivity and simultaneously maintain a high oxygen content thereby maximizing Jc in anisotropic bulk ceramics. © 1988 Nature Publishing Group.

Journal article

HUMPHREYS CJ, EAGLESHAM DJ, ALFORD NM, HARMER MA, BIRCHALL JDet al., 1988, HIGH-TEMPERATURE SUPERCONDUCTORS, 9TH EUROPEAN CONGRESS ON ELECTRON MICROSCOPY, Publisher: IOP PUBLISHING LTD, Pages: 217-222

Conference paper

RINGNALDA J, EAGLESHAM DJ, HUMPHREYS CJ, ALFORD NMet al., 1988, THE HIGH-TEMPERATURE MICROSTRUCTURE OF 1-2-3 SUPERCONDUCTORS, INSTITUTE OF PHYSICS CONFERENCE SERIES, Pages: 247-248, ISSN: 0951-3248

Journal article

RINGNALDA J, EAGLESHAM DJ, HUMPHREYS CJ, ALFORD NMet al., 1988, THE HIGH-TEMPERATURE MICROSTRUCTURE OF 1-2-3 SUPERCONDUCTORS, 9TH EUROPEAN CONGRESS ON ELECTRON MICROSCOPY, Publisher: IOP PUBLISHING LTD, Pages: 247-248

Conference paper

CHUN WC, ROSEINNES AC, ALFORD NM, HARMER MA, BIRCHALL JDet al., 1988, THE EFFECT OF POROSITY ON THE SUPERCONDUCTING PROPERTIES OF YBA2CU3OX CERAMIC, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 1, Pages: 113-117, ISSN: 0953-2048

Journal article

HUMPHREYS CJ, EAGLESHAM DJ, ALFORD NM, HARMER MA, BIRCHALL JDet al., 1988, HIGH-TEMPERATURE SUPERCONDUCTORS, INSTITUTE OF PHYSICS CONFERENCE SERIES, Pages: 217-222, ISSN: 0951-3248

Journal article

BIRCHALL JD, ALFORD NM, KENDALL K, 1987, EFFECT OF CHEMICAL BONDING AT LOW-TEMPERATURE ON THE MECHANICAL-PROPERTIES OF AN UNSINTERED SIC COMPACT, JOURNAL OF MATERIALS SCIENCE LETTERS, Vol: 6, Pages: 1456-1458, ISSN: 0261-8028

Journal article

ALFORD NM, BIRCHALL JD, KENDALL K, 1987, HIGH-STRENGTH CERAMICS THROUGH COLLOIDAL CONTROL TO REMOVE DEFECTS, NATURE, Vol: 330, Pages: 51-53, ISSN: 0028-0836

Journal article

EAGLESHAM DJ, HUMPHREYS CJ, ALFORD NM, CLEGG WJ, HARMER MA, BIRCHALL JDet al., 1987, NEW PHASES IN THE SUPERCONDUCTING Y-BA-CU-O SYSTEM, APPLIED PHYSICS LETTERS, Vol: 51, Pages: 457-459, ISSN: 0003-6951

Journal article

KENDALL K, ALFORD NM, BIRCHALL JD, 1987, ELASTICITY OF PARTICLE ASSEMBLIES AS A MEASURE OF THE SURFACE-ENERGY OF SOLIDS, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 412, Pages: 269-&, ISSN: 1364-5021

Journal article

EAGLESHAM DJ, HUMPHREYS CJ, CLEGG WJ, HARMER MA, ALFORD NM, BIRCHALL JDet al., 1987, THE ORTHORHOMBIC AND TETRAGONAL PHASES OF Y1BA2CU3O9-Y, ADVANCED CERAMIC MATERIALS, Vol: 2, Pages: 662-667, ISSN: 0883-5551

Journal article

KENDALL K, ALFORD NM, BIRCHALL JD, 1987, A NEW METHOD FOR MEASURING THE SURFACE-ENERGY OF SOLIDS, NATURE, Vol: 325, Pages: 794-796, ISSN: 0028-0836

Journal article

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