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

Petrov PK, Alford NM, Kozyrev A, Gaidukov M, Altynnikov A, Vasilevskiy A, Konoplev G, Tumarkin A, Gagarin Aet al., 2010, Effect of ultraviolet radiation on slow-relaxation processes in ferroelectric capacitance structures, JOURNAL OF APPLIED PHYSICS, Vol: 107, ISSN: 0021-8979

Journal article

Cheong H-S, Wild J, Alford N, Valkov I, Randell C, Paley Met al., 2010, A High Temperature Superconducting Imaging Coil for Low-Field MRI, CONCEPTS IN MAGNETIC RESONANCE PART B-MAGNETIC RESONANCE ENGINEERING, Vol: 37B, Pages: 56-64, ISSN: 1552-5031

Journal article

Valant M, Kolodiazhnyi T, Axelsson A-K, Babu GS, Alford NMet al., 2010, Spin Ordering in Mn-Doped KTaO3?, CHEMISTRY OF MATERIALS, Vol: 22, Pages: 1952-1954, ISSN: 0897-4756

Journal article

Axelsson A-K, Valant M, Alford NM, 2010, Influence of point defects in KTaO3 on low-temperature dielectric relaxation, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 30, Pages: 941-946, ISSN: 0955-2219

Journal article

Axelsson A-K, Pan Y, Valant M, Alford NMet al., 2010, Chemistry, Processing, and Microwave Dielectric Properties of Mn-Substituted KTaO3 Ceramics, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 93, Pages: 800-805, ISSN: 0002-7820

Journal article

Valant M, Axelsson A-K, Aguesse F, Alford NMet al., 2010, Molecular Auxetic Behavior of Epitaxial Co-Ferrite Spinel Thin Film, ADVANCED FUNCTIONAL MATERIALS, Vol: 20, Pages: 644-647, ISSN: 1616-301X

Journal article

Schmidgall E, Walters RA, Centeno A, Petrov PK, Alford NMet al., 2010, Temperature stable BaxSr1-xTiO3 thin film structures for microwave devices, ELECTRONICS LETTERS, Vol: 46, Pages: 277-U27, ISSN: 0013-5194

Journal article

Karpinsky DV, Selezneva EK, Bdikin IK, Figueiras F, Kamentsev KE, Fetisov YK, Pullar RC, Krebbs J, Alford NM, Kholkin ALet al., 2010, Development of Novel Multiferroic Composites Based on BaTiO3 and Hexagonal Ferrites, Symposium on Novel Materials and Devices for Spintronics, Publisher: MATERIALS RESEARCH SOC, Pages: 115-+, ISSN: 0272-9172

Conference paper

Centeno A, Breeze J, Ahmed B, Reehal H, Alford Net al., 2010, Scattering of light into silicon by spherical and hemispherical silver nanoparticles, OPTICS LETTERS, Vol: 35, Pages: 76-78, ISSN: 0146-9592

Journal article

Shimada T, Ichikawa K, Minemura T, Kolodiazhnyi T, Breeze J, Alford NM, Annino Get al., 2010, Temperature and frequency dependence of dielectric loss of Ba(Mg1/3Ta2/3)O-3 microwave ceramics, 11th Electroceramics Conference 2008, Publisher: ELSEVIER SCI LTD, Pages: 331-334, ISSN: 0955-2219

Conference paper

Fradkin L, Mishakin V, Alford N, Dobroskok A, Linkov A, Mishuris Get al., 2009, Perturbing paths of slow cracks in PMMA by local heating, Pages: 37-47, ISSN: 1875-3507

Real-time control of the direction of a propagating crack is little explored area of management of structural integrity. We have examined it with experiments on quasi-static (slow) cracks in PMMA (Polymethyl-Methacrylate). We have observed that in PMMA when the mean crack speeds are low (between 0.1 and 0.4mms -1) secondary thermal sources of relatively low power (of the order of 2W) can be used to achieve a significant crack redirection. In this interval the micro-photographs of cracks present a fishbone structure, and we argue that the side lobes are micro-cracks which appear inside shear bands. The respective fracture surfaces look rippled (hackled). We have observed a clear reverse correlation between the crack speed and the angle of redirection. When the mean crack speed exceeds 0.4mms -1 and the fracture surface is mirror smooth no trajectory redirection is achieved. It appears the micro-cracks act as notches and alleviate crack redirection. Therefore, one of our conclusions is that it might be possible to use relatively weak sources to redirect fast cracks that propagate with a super-critical speed. This hypothesis is advanced because fast cracks are also known to possess a fishbone structure and hackled fracture surface. © 2009 Springer Science+Business Media B.V.

Conference paper

Karpinsky DV, Selezneva EK, Bdikin K, Figueiras F, Kamentsev KE, Fetisov YK, Pullar RC, Krebbs J, Alford NM, Kholkin ALet al., 2009, Development of novel multiferroic composites based on BaTiO<inf>3</inf>and hexagonal ferrites, Pages: 13-18, ISSN: 0272-9172

New multiferroic composite ceramics with the general formula (x)Ba(Sr)Fe12O19-(1-x)BaTiO3(x=0.1, 0.5) were synthesized via a simple solid-state reaction technique. Crystal structure analysis performed for such materials revealed the presence of two crystalline phases pertinent to the initial composite components. X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to assess the crystallinity, microstructure, and local magnetoelectric interactions between ferroelectric and ferromagnetic grains. Magnetic measurements revealed that the saturation magnetization is proportional to the volume fraction of ferrite phase. Dielectric studies demonstrated strong frequency relaxation due to space charge polarization and high conductivity loss making macroscopic magnetoelectric measurements difficult. Novel nanoscale magnetoelectric effect observed by AFM is discussed. © 2009 Materials Research Society.

Conference paper

Karpinsky DV, Selezneva EK, Bdikin IK, Figueiras F, Kamentsev KE, Fetisov YK, Pullar RC, Kretbs J, Alford NM, Kholkin ALet al., 2009, Development of novel multiferroic composites based on BaTiO<inf>3</inf> and hexagonal ferrites, Pages: 7-12, ISSN: 0272-9172

New multiferroic composite ceramics with the general formula (x)Ba(Sr)Fe12O19-(l-x)BaTiO3 (x=O. 1, 0.5) were synthesized via a simple solid-state reaction technique. Crystal structure analysis performed for such materials revealed the presence of two crystalline phases pertinent to the initi2l composite components. X-ray diffraction (XRD), scanning electron microscopy (SEM) nd atomic force microscopy (AFM) were used to assess the crystallinity, microstructure, and local magnetoelectric interactions between ferroelectric and ferromagnetic grains. Magnetic measurements revealed that the saturation magnetization is proportional to the volume fraction of ferrite phase. Dielectric studies demonstrated strong frequency relaxation due to space charge polarization and high conductivity loss making macroscopic magnetoelectric measurements difficult. Novel nanoscale magnetoelectric effect observed by AFM is discussed. © 2009 Materials Research Society.

Conference paper

Axelsson AK, Pan Y, Valant M, Alford Net al., 2009, Synthesis, sintering, and microwave dielectric properties of kTaO 3 ceramics, Journal of the American Ceramic Society, Vol: 92, Pages: 1773-1778, ISSN: 0002-7820

Studies of a synthesis of KTaO3 displayed a two-step reaction path with the intermediate formation of K2Ta4O 11. Thermal and X-ray diffraction analysis showed that the synthesis is completed at 900°C. Sintering studies showed that KTaO3 powder can produce single phase ceramics with 85% of relative density with the addition of 5% of potassium excess when sintered at 1330°C for 1 h. Longer sintering times or higher temperatures result in enhanced potassium loss and consequent formation of K6Ta10.8O30 secondary phase with tetragonal tungsten bronze structure. Room- and low-temperature microwave dielectric properties of KTaO3 ceramics compare well with measurements performed on single crystals. We evaluated the influence of microstructural features (porosity, structural defects, secondary phases) on the dielectric properties of the ceramic samples. © 2009 The American Ceramic Society.

Journal article

Kozyrev A, Gaidukov M, Gagarin A, Altynnikov A, Osadchy V, Tumarkin A, Petrov PK, Alford NMet al., 2009, Evaluation of the space charge trap energy levels in the ferroelectric films, JOURNAL OF APPLIED PHYSICS, Vol: 106, ISSN: 0021-8979

Journal article

Rawal R, McQueen AJ, Gillie LJ, Hyatt NC, McCabe EE, Samara K, Alford NM, Feteira A, Reaney IM, Sinclair DCet al., 2009, Influence of octahedral tilting on the microwave dielectric properties of A(3)LaNb(3)O(12) hexagonal perovskites (A=Ba, Sr), APPLIED PHYSICS LETTERS, Vol: 94, ISSN: 0003-6951

Journal article

Axelsson A-K, Valant M, Fenner L, Wills AS, Alford NMet al., 2009, Chemistry of post-annealing of epitaxial CoFe2O4 thin films, THIN SOLID FILMS, Vol: 517, Pages: 3742-3747, ISSN: 0040-6090

Journal article

Breeze JD, Perkins JM, McComb DW, Alford NMet al., 2009, Do Grain Boundaries Affect Microwave Dielectric Loss in Oxides?, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 92, Pages: 671-674, ISSN: 0002-7820

Journal article

Breeze J, Krupka J, Centeno A, Alford NMet al., 2009, Temperature-stable and high Q-factor TiO2 Bragg reflector resonator, APPLIED PHYSICS LETTERS, Vol: 94, ISSN: 0003-6951

Journal article

Pullar RC, Penn SJ, Wang X, Reaney IM, Alford NMet al., 2009, Dielectric loss caused by oxygen vacancies in titania ceramics, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 29, Pages: 419-424, ISSN: 0955-2219

Journal article

Pullar RC, Zhang Y, Chen L, Yang S, Evans JRG, Salak AN, Kiselev DA, Kholkin AL, Ferreira VM, Alford NMet al., 2009, Dielectric measurements on a novel Ba1-xCaxTiO3 (BCT) bulk ceramic combinatorial library, International Conference on Electroceramics, Publisher: SPRINGER, Pages: 245-251, ISSN: 1385-3449

Conference paper

Fradkin L, Mishakin V, Alford N, Dobroskok A, Linkov A, Mishuris Get al., 2009, Perturbing Paths of Slow Cracks in PMMA by Local Heating, IUTAM Symposium on Scaling in Solid Mechanics, Publisher: SPRINGER, Pages: 37-+

Conference paper

Shimada T, Ichikawa K, Minemura T, Yamauchi H, Utsumi W, Ishii Y, Breeze J, Alford NMet al., 2009, Intrinsic Microwave Dielectric Loss of Lanthanum Aluminate, Joint Meeting of 12th International Meeting on Ferroelectricity/18th IEEE International Symposium on Applications of Ferroelectrics (IMF-ISAF-2009), Publisher: IEEE, Pages: 250-+, ISSN: 1099-4734

Conference paper

Buslov OY, Keys VN, Kozyrev AB, Shimko AY, Alford NMN, Petrov PKet al., 2008, Band-pass tunable filter based on planar dielectric resonators, Pages: 513-514

An X-band 2-pole filter based on uniplanar dielectric resonators (PDR) with ferroelectric tuning was designed and fabricated. PDR's were chosen because of their high Q-factor and the rarefied spectrum of resonance mode frequencies. At frequency ~10.5GHz the filter displayed insertion losses not more than S 21=-3dB in the bandwidth Δf=110MHz. The frequency of tuning was ΔF=420MHz. © 2008: CriMiCo'2008 Organizing Committee.

Conference paper

Alford NMN, Buslov OY, Keis VN, Kozyrev AB, Petrov PK, Shimko AYet al., 2008, Band-pass tunable ferroelectric filter based on uniplanar dielectric resonators, Pages: 1703-1706

An X-band 2-pole filter based on uniplanar dielectric resonators (UPDR) with ferroelectric tuning was designed and fabricated. UPDRs were chosen because of their high Q-factor, the rarefied spectrum of resonance mode frequencies, simplicity of manufacture and the convenience for integrating a ferroelectric tuning varactor. The analytical description of the filter response is presented and good agreement between simulated and measured experimental data is demonstrated. At a frequency of ∼ 10.5 GHz the filter displayed insertion losses not more than S21 = -3.5 dB in the bandwidth Δf ∼ 110 MHz. The frequency of tuning was ΔF ∼ 420 MHz. © 2008 EuMA.

Conference paper

Kimber DP, Pullar RC, Alford NM, 2008, The effects of dielectric loss and tip resistance on resonator Q of the scanning evanescent microwave microscopy (SEMM) probe, MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 19, ISSN: 0957-0233

Journal article

Dunne LJ, Valant M, Manos G, Axelsson A-K, Alford Net al., 2008, Microscopic theory of the electrocaloric effect in the paraelectric phase of potassium dihydrogen phosphate, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951

Journal article

Salak AN, Ferreira VM, Ribeiro JL, Vieira LG, Pullar RC, Alford NMet al., 2008, Bismuth-induced dielectric relaxation in the (1-x)La(Mg1/2Ti1/2)O-3-xBi(Mg1/2Ti1/2)O-3 perovskite system, JOURNAL OF APPLIED PHYSICS, Vol: 104, ISSN: 0021-8979

Journal article

Scott DJ, Manos S, Coveney PV, Rossiny JCH, Fearn S, Kilner JA, Pullar RC, Alford NMN, Axelsson A-K, Zhang Y, Chen L, Yang S, Evans JRG, Sebastian MTet al., 2008, Functional ceramic materials database: An online resource for materials research, JOURNAL OF CHEMICAL INFORMATION AND MODELING, Vol: 48, Pages: 449-455, ISSN: 1549-9596

Journal article

Petrov PK, Pan Y, Zou B, Alford NMet al., 2008, Dielectric constant and loss tangent of thin ferroelectric films at microwave frequencies - How accurately can we evaluate them?, 19th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 27-37, ISSN: 1058-4587

Conference paper

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