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

Alford N, Petrov P, Salinas E, Dimitriou S, Hilton Ret al., 2006, Transforming electronics, MATERIALS WORLD, Vol: 14, Pages: 18-19, ISSN: 0967-8638

Journal article

Rawal R, Feteira A, Hyatt NC, Sinclair DC, Sarma K, Alford NMet al., 2006, Microwave dielectric properties of hexagonal 12R-Ba3LaNb3O12 ceramics, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 89, Pages: 332-335, ISSN: 0002-7820

Journal article

Rawal R, Feteira A, Flores AA, Hyatt NC, West AR, Sinclair DC, Sarma K, Alford NMet al., 2006, Dielectric properties of the "twinned" 8H-hexagonal perovskite Ba8Nb4Ti3O24, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 89, Pages: 336-339, ISSN: 0002-7820

Journal article

Axelsson AK, Alford NM, 2006, Bismuth titanates candidates for high permittivity LTCC, 3rd International Conference on Microwave Materials and Their Applications, Publisher: ELSEVIER SCI LTD, Pages: 1933-1936, ISSN: 0955-2219

Conference paper

Pullar RC, Lai C, Alford NM, 2006, V2O5-doped M2+Cu2Nb2O8 compounds (M2+ = Zn, Co, Ni, Mg & Ca) for microwave dielectric LTCCs, 3rd International Materials Symposium/12th Meeting of the Sociedad-Portuguesa-da-Materials (Materials 2005/SPM), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 264-268, ISSN: 0255-5476

Conference paper

Kamba S, Noujni D, Pashkin A, Petzelt J, Pullar RC, Axelsson A-K, Alford NMet al., 2006, Low-temperature microwave and THz dielectric response in novel microwave ceramics, 3rd International Conference on Microwave Materials and Their Applications, Publisher: ELSEVIER SCI LTD, Pages: 1845-1851, ISSN: 0955-2219

Conference paper

Pullar RC, Lai C, Azough F, Freer R, Alford NMet al., 2006, Novel microwave dielectric LTCCs based upon V2O5 doped M2+Cu2Nb2O8 compounds (M2+ = Zn, Co, Ni, Mg and Ca), 3rd International Conference on Microwave Materials and Their Applications, Publisher: ELSEVIER SCI LTD, Pages: 1943-1946, ISSN: 0955-2219

Conference paper

Alford NM, Petrov PK, Gagarin AG, Kozyrev AB, Sokolov AI, Soldatenkov OI, Volpyas VAet al., 2005, Enhanced electrical properties of ferroelectric thin films by ultraviolet radiation, APPLIED PHYSICS LETTERS, Vol: 87, ISSN: 0003-6951

Journal article

Petrov PK, Alford NM, 2005, Improved SrTiO3 thin films using oxygen relaxation technique, APPLIED PHYSICS LETTERS, Vol: 87, ISSN: 0003-6951

Journal article

Pullar RC, Breeze JD, Alford NM, 2005, Characterization and microwave dielectric properties of M2+Nb2O6 ceramics, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 88, Pages: 2466-2471, ISSN: 0002-7820

Journal article

Petrov PK, Alford NMN, Gevorgyan S, 2005, Techniques for microwave measurements of ferroelectric thin films and their associated error and limitations, MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 16, Pages: 583-589, ISSN: 0957-0233

Journal article

Alford NM, Buslov O, Keis V, Kotelnikov I, Kozyrev A, Kulik P, Petrov PKet al., 2005, Tunable 4-pole piezoelectric filter based on two dielectric resonators, INTEGRATED FERROELECTRICS, Vol: 77, Pages: 123-128, ISSN: 1058-4587

Journal article

Walters RA, Centeno A, Petrov PK, McN Alford Net al., 2005, Tuneable end-coupled ferroelectric-gap filters based on barium strontium titanate capacitors, Asia-Pacific Conference on Applied Electromagnetics (APACE 2005), Publisher: IEEE, Pages: 250-252

Conference paper

Fradkin L, Mishakin V, Alford N, 2005, Re-directing slow cracks in PMMA, PHILOSOPHICAL MAGAZINE, Vol: 85, Pages: 2345-2361, ISSN: 1478-6435

Journal article

Aupi X, Breeze J, Ljepojevic N, Dunne LJ, Malde N, Axelsson AK, Alford NMet al., 2004, Microwave dielectric loss in oxides: Theory and experiment (vol 95, pg 2639, 2004), JOURNAL OF APPLIED PHYSICS, Vol: 96, Pages: 6943-6943, ISSN: 0021-8979

Journal article

Pullar RC, Vaughan C, Alford NMN, 2004, Effect of sintering aids upon dielectric microwave properties of ZnNb <inf>2</inf>O<inf>6</inf>, CoNb<inf>2</inf>O<inf>6</inf>, MgNb<inf>2</inf>O <inf>6</inf> and CaNb<inf>2</inf>O<inf>6</inf> columbite niobates, Pages: 1157-1160, ISSN: 1013-9826

Of the columbite niobate ceramics with the formula M2+Nb 2O6, several compounds (M2+ = Zn, Mg, Ca and Co) display dielectric losses at microwave (1-10 GHz) frequencies resulting in Qf values between 40,000 and 90,000 GHz, making them suitable materials for use in dielectric resonator applications. However, their temperature coefficient of resonant frequency (τf) values were high, at between -50 to -90 ppm, and the optimum sintering temperatures were found to be 1150°C, 1200°C, 1300°C and 1350°C for M = Co, Zn, Mg and Ca respectively. Doping with relatively large amounts of TiO2 and CaTiO3 was found to reduce τf in most cases, but with a large increase in dielectric losses (decrease in Q). This paper details the doping of these ceramics with sintering aids (<2 wt%) such as V2O5 and CuO, in an attempt to reduce the sintering temperature. It was found that in many cases the dopants also had an extremely beneficial effect upon microwave properties, decreasing τf considerably and substantially increasing the quality factor (Q).

Conference paper

ALFORD NEIL MCNEILL, PENN STUART JAMES, 2004, Temperature stabilization of dielectric resonator, US6803132

Patent

Sebastian MT, Santha N, Bijumon PV, Axelsson AK, Alford NMet al., 2004, Microwave dielectric properties of (1-x)CeO2-xCaO2-xTiO3 and (1-x)CeO2-xSM2O3 ceramics, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 24, Pages: 2583-2589, ISSN: 0955-2219

Journal article

Alford N, 2004, Microwave mania, MATERIALS WORLD, Vol: 12, Pages: 21-23, ISSN: 0967-8638

Journal article

Kamba S, Hughes H, Noujni D, Surendran S, Pullar RC, Samoukhina P, Petzelt J, Freer R, Alford NM, Iddles DMet al., 2004, Relationship between microwave and lattice vibration properties in Ba(Zn1/3Nb2/3)O-3-based microwave dielectric ceramics, JOURNAL OF PHYSICS D-APPLIED PHYSICS, Vol: 37, Pages: 1980-1986, ISSN: 0022-3727

Journal article

PETROV PETER, ALFORD NEIL, 2004, Tuneable dielectric resonator, US2004135655

Patent

Santha NL, Sebastian MT, Mohanan P, Alford NM, Sarma K, Pullar RC, Kamba S, Pashkin A, Samukhina P, Petzelt Jet al., 2004, Effect of doping on the dielectric properties of cerium oxide in the microwave and far-infrared frequency range, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 87, Pages: 1233-1237, ISSN: 0002-7820

Journal article

Keith GM, Sarma K, Alford NM, Sinclair DCet al., 2004, Electrical properties of 6H-BaTi0.95M0.0O3-delta ceramics where M = Mn, Fe, Co and Ni, International Conference on Electroceramics (ICE 2003), Publisher: KLUWER ACADEMIC PUBL, Pages: 305-309, ISSN: 1385-3449

Conference paper

Keith GM, Kirk CA, Sarma K, Alford NM, Cussen EJ, Rosseinsky MJ, Sinclair DCet al., 2004, Synthesis, crystal structure, and characterization of Ba(Ti1/2Mn1/2)O-3: A high permittivity 12R-type hexagonal perovskite, CHEMISTRY OF MATERIALS, Vol: 16, Pages: 2007-2015, ISSN: 0897-4756

Journal article

Seabra MP, Avdeev M, Ferreira VM, Pullar RC, Alford NM, Reaney IMet al., 2004, Structure-property relations in xBaTiO(3)-(1-x)La(Mg1/2Ti1/2)O-3 solid solutions, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 87, Pages: 584-590, ISSN: 0002-7820

Journal article

Aupi X, Breeze J, Ljepojevic N, Dunne LJ, Malde N, Axelsson AK, Alford NMet al., 2004, Microwave dielectric loss in oxides: Theory and experiment, JOURNAL OF APPLIED PHYSICS, Vol: 95, Pages: 2639-2645, ISSN: 0021-8979

Journal article

Pullar RC, Vaughan C, Alford NM, 2004, The effects of sintering aids upon dielectric microwave properties of columbite niobates, M2+Nb2O6, Conference on Dielectrics for Emerging Technologies held at the IOP Physics Congress, Publisher: IOP PUBLISHING LTD, Pages: 348-352, ISSN: 0022-3727

Conference paper

Buslov OY, Keys VN, Kozyrev AB, Kotelnikov IV, Kulik PV, Alford NM, Petrov PKet al., 2004, Tuneable piezoelectric filter based on a dual-mode dielectric resonator, 14th International Crimean Conference on Microwave and Telecommunication Technology, Publisher: WEBER PUBLISHING CO, Pages: 410-411

Conference paper

Petrov PK, Sarma K, Alford NM, 2004, Evaluation of residual stress in thin ferroelectric films using grazing incident X-ray diffraction, 10th European Meeting on Ferroelectricity, Publisher: TAYLOR & FRANCIS LTD, Pages: 183-189, ISSN: 1058-4587

Conference paper

Petrov PK, Alford NM, Buslov O, Keis V, Kotelnikov I, Kulik P, Kozyrev Aet al., 2004, Tuneable two-pole one-dielectric-resonator filter with elliptic characteristics, 16th International Symposium on Integrated Ferroelectrics/5th Korean Workshop on High Dielectric Devices and Materials, Publisher: TAYLOR & FRANCIS LTD, Pages: 261-+, ISSN: 1058-4587

Conference paper

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