Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

402 results found

Sarma K, Petrov PK, Alford NM, 2004, Single- and multi-target pulsed laser deposition of thin BSTO films: Preparation, microstructure and electrical properties, Symposium on Ferroelectric Thin Films XII held at the 2003 MRS Fall Meeting, Publisher: MATERIALS RESEARCH SOCIETY, Pages: 369-374, ISSN: 0272-9172

Conference paper

Noujni D, Kamba S, Pashkin A, Bovtun V, Petzelt J, Axelsson AK, Alford NM, Wise PL, Reaney IMet al., 2004, Temperature dependence of microwave and THz dielectric response in Srn+1TinO3n+1 (n=1-4), 10th European Meeting on Ferroelectricity, Publisher: TAYLOR & FRANCIS LTD, Pages: 199-203, ISSN: 1058-4587

Conference paper

Sarma K, Farooq R, Jarman K, Pullar RC, Petrov PK, Alford NMet al., 2004, Sintering behaviour of BaxSr1-xTiO3, 10th European Meeting on Ferroelectricity, Publisher: TAYLOR & FRANCIS LTD, Pages: 249-252, ISSN: 1058-4587

Conference paper

Keith GM, Rampling MJ, Sarma K, Alford NM, Sinclair DCet al., 2004, Synthesis and characterisation of doped 6H-BaTiO3 ceramics, 8th International Conference on Electronic Ceramics and Their Applications (ELECTROCERAMICS VIII), Publisher: ELSEVIER SCI LTD, Pages: 1721-1724, ISSN: 0955-2219

Conference paper

Pullar RC, Vaughan C, Alford NM, 2004, Effect of sintering aids upon dielectric microwave properties of ZnNb2O6, CoNb2O6, MgNb2O6 and CaNb2O6 columbite niobates, 8th Conference of the European-Ceramic-Society, Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 1157-1160, ISSN: 1013-9826

Conference paper

Seabra MP, Avdeev M, Ferreira VM, Pullar RC, Alford NMN, Reaney IMet al., 2004, Structure-property relations in xBaTiO<inf>3</inf>-(1-x)La(Mg<inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> solid solutions, Journal of the American Ceramic Society, Vol: 87, Pages: 584-590, ISSN: 0002-7820

The microwave dielectric properties and microstructures of compounds in the solid solution series xBaTiO3-(1-x)La(Mg1/2-Ti1/2)O3 (BTLMT) have been investigated. The structural phase transitions that occur as a function of x have been studied and are related to changes in the dielectric properties. For compounds where x ≤ 0.1, X-ray diffraction (XRD) showed evidence of 1:1 ordering between Mg and Ti cations. For x ≤ 0.3, XRD and electron diffraction revealed that compounds were tilted in both antiphase and in-phase. However, for 0.3 < x < 0.7, only antiphase tilting was present. The temperature coefficient of resonant frequency (τf) vs the relative permittivity (εr) was linear until x = 0.5 at which point in the solid solution the transition to a nontilted structure resulted in nonlinear behavior. τf values close to zero (-2 ppm/°C) were achieved at x = 0.5 (εr ∼ 60), which had a quality factor (Q·fo) of 9600 GHz.

Journal article

ALFORD NEIL MCNEILL, PENN STUART JAMES, 2003, Modified sintered materials, US6610623

Patent

ALFORD NEIL MCNEILL, PENN STUART JAMES, 2003, Sintered Materials, US2003013597

Patent

Feteira A, Sarma K, Alford NM, Reaney IM, Sinclair DCet al., 2003, Microwave dielectric properties of gallium-doped hexagonal barium titanate ceramics, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 86, Pages: 511-513, ISSN: 0002-7820

Journal article

Seabra MP, Avdeev M, Ferreira VM, Pullar RC, Alford NMet al., 2003, Structure and microwave dielectric properties of La(Mg0.5Ti0.5)O-3-CaTiO3 system, International Conference on Microwave Materials and Their Applications (MMA 2002), Publisher: ELSEVIER SCI LTD, Pages: 2403-2408, ISSN: 0955-2219

Conference paper

Petrov PK, Alford NM, Astafiev KF, Tagantsev AK, Setter N, Kaydanova T, Ginley DSet al., 2003, Structural investigation of thin SrTiO3 films grown on MgO and LaAlO3 substrates, 15th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 465-473, ISSN: 1058-4587

Conference paper

Pullar RC, Okeneme K, Alford NM, 2003, Temperature compensated niobate microwave ceramics with the columbite structure, M(2)(2+Nb)(O)6, International Conference on Microwave Materials and Their Applications (MMA 2002), Publisher: ELSEVIER SCI LTD, Pages: 2479-2483, ISSN: 0955-2219

Conference paper

Pullar RC, Axelsson AK, Alford NM, 2003, Near-zero tau(f) doped-niobate ceramics for dielectric resonator applications, Symposium on Dielectric Materials and Multilayer Electronic Devices/Symposium on Morphotropic Phase Boundary Phenomena and Peroviskite Materials, Publisher: AMER CERAMIC SOC, Pages: 287-304, ISSN: 1042-1122

Conference paper

Breeze JD, Aupi X, Alford NM, 2002, Ultralow loss polycrystalline alumina, APPLIED PHYSICS LETTERS, Vol: 81, Pages: 5021-5023, ISSN: 0003-6951

Journal article

Feteira A, Keith GM, Rampling MJ, Kirk CA, Reaney IM, Sarma K, Alford NM, Sinclair DCet al., 2002, Synthesis and characterisation of Ga-doped hexagonal BaTiO3, Symposium on Crystal Chemistry of Functional Materials held at the E-MRS Spring Meeting, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 439-448, ISSN: 1463-0184

Conference paper

Alford NM, Petrov PK, Breeze J, Sarma KSet al., 2002, Piezoelectrically tuned dielectric resonators, ELECTRONICS LETTERS, Vol: 38, Pages: 855-857, ISSN: 0013-5194

Journal article

Webb SJ, Breeze J, Scott RI, Cannell DS, Iddles DM, Alford NMet al., 2002, Raman spectroscopic study of gallium-doped Ba(Zn1/3Ta2/3)O-3, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 85, Pages: 1753-1756, ISSN: 0002-7820

Journal article

Yates KA, Berenov AV, Sharma A, Driscoll JLM, Axelsson AK, Alford NM, Cohen LFet al., 2002, Comparison of DC resistivity and microwave transport properties of preferentially de-oxygenated polycrystalline La0.67Ca0.33MnO3, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 247, Pages: 105-110, ISSN: 0304-8853

Journal article

Alford NM, Breeze J, Aupi X, 2002, Dielectric loss of oxide single crystals and polycrystalline analogues from 10 K to 300 K, 2nd China International Conference on High-Performance Ceramics (CICC-2), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 17-22, ISSN: 1013-9826

Conference paper

Pullar RC, Breeze JD, Alford NM, 2002, Microwave dielectric properties of columbite-structure niobate ceramics, M2+Nb2O6, 2nd China International Conference on High-Performance Ceramics (CICC-2), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 1-4, ISSN: 1013-9826

Conference paper

Petrov PK, Sarma V, Poole M, Alford NMet al., 2002, Preparation and properties of BSTO thick films on metal substrates, Ferroelectrics UK 2001 Meeting, Publisher: MANEY PUBLISHING, Pages: 113-117

Conference paper

GALLOP, JOHN CHARLES, ALFORD NEIL MCNEILL, 2001, POSITIONING METHOD FOR A MOBILE TELEPHONE RECEIVER, WO0163957

Patent

Petrov PK, Alford NM, 2001, Tunable dielectric resonator with ferroelectric element, ELECTRONICS LETTERS, Vol: 37, Pages: 1066-1067, ISSN: 0013-5194

Journal article

Bracanovic D, Esmail AA, Penn SJ, Webb SJ, Button TW, Alford NMet al., 2001, Surface YBa2Cu3O7 receive coils for low field MRI, 2000 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 2422-2424, ISSN: 1051-8223

Conference paper

Reaney IM, Wise P, Ubic R, Breeze J, Alford NM, Iddles D, Cannell D, Price Tet al., 2001, On the temperature coefficient of resonant frequency in microwave dielectrics, PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, Vol: 81, Pages: 501-510, ISSN: 0141-8610

Journal article

Alguero M, Cheng BL, Guiu F, Reece MJ, Poole M, Alford Net al., 2001, Degradation of the d(33) piezoelectric coefficient for PZT ceramics under static and cyclic compressive loading, 7th International Conference on Electronic Ceramics and their Applications (ELECTROCERAMICS VII-2000), Publisher: ELSEVIER SCI LTD, Pages: 1437-1440, ISSN: 0955-2219

Conference paper

Alford NM, Penn SJ, Templeton A, Wang X, Webb Set al., 2001, Materials and processing developments in microwave ceramics, INDUSTRIAL CERAMICS, Vol: 21, Pages: 21-23, ISSN: 1121-7588

Journal article

Alford NM, Breeze J, Wang X, Penn SJ, Dalla S, Webb SJ, Ljepojevic N, Aupi Xet al., 2001, “Dielectric Loss of oxide single crystals and polycrystalline analogues from 10 to 320K”, Pages: 2605-2611

Conference paper

McN Alford N, Breeze J, Penn SJ, Poole Met al., 2000, Temperature compensated high Q and high thermal conductivity dielectrics for Ku and Ka band communications, IEE Colloquium (Digest), Pages: 25-28, ISSN: 0963-3308

Aluminium oxide is a favourable candidate for use as a dielectric resonator in Ku and Ka band microwave devices especially at high powers due to its very low tanδ ∼2×10-5at 10 GHz, modest relative permittivity of 9.8 and high thermal conductivity of 30 W/mK. However, its temperature coefficient of the resonant frequency TCf of -60ppm/K is rather high for practical purpose. The application of a film of titanium oxide which has an opposite sign TCf of +450ppm/K. onto an alumina puck, produces a composite in which the TCf can be tuned to be zero across a large temperature range. The tanδ of the composite at zero TCf is 3.3×10-5(Qd =30,000) at-room temperature and 10GHz.

Journal article

Alford NMN, Breeze J, Penn SJ, Poole Met al., 2000, Layered Al2O3-TiO2 composite dielectric resonators with tuneable temperature coefficient for microwave applications, IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY, Vol: 147, Pages: 269-273, ISSN: 1350-2344

Journal article

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