Publications
343 results found
Chung H-C, Kummari KL, Croucher SJ, et al., 2009, Development of piezoelectric fans for flapping wing application, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 149, Pages: 136-142, ISSN: 0924-4247
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- Citations: 36
Marshall JM, Zhang Q, Whatmore RW, 2008, Corona poling of highly (001)/(100)-oriented lead zirconate titanate thin films, THIN SOLID FILMS, Vol: 516, Pages: 4679-4684, ISSN: 0040-6090
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- Citations: 17
Rayner PJ, Wilson SA, Whatmore RW, et al., 2008, A simple technique for automated performance testing of piezoelectric micro-motors by transient motion analysis, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 144, Pages: 130-134, ISSN: 0924-4247
Corkovic S, Whatmore RW, Zhang Q, 2008, Development of residual stress in sol-gel derived Pb(Zr,Ti)O<sub>3</sub> films:: An experimental study, JOURNAL OF APPLIED PHYSICS, Vol: 103, ISSN: 0021-8979
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- Citations: 34
Popov C, Chang H, Record PM, et al., 2008, Direct and converse magnetoelectric effect at resonant frequency in laminar piezoelectric-magnetostrictive composite, Conference on Piezoelectricity for End Users III, Publisher: SPRINGER, Pages: 53-58, ISSN: 1385-3449
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- Citations: 23
Whatmore RW, Zhang Q, Shaw CP, et al., 2007, Pyroelectric ceramics and thin films for applications in uncooled infra-red sensor arrays, 2nd International Symposium on Functional Materials, Publisher: IOP PUBLISHING LTD, Pages: 6-11, ISSN: 0031-8949
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- Citations: 27
Corkovic S, Zhang Q, Whatmore RW, 2007, The investigation of key processing parameters in fabrication of Pb(Zr <sub>x</sub>Ti<sub>1-x</sub>)O<sub>3</sub> thick films for MEMS applications, Piezoceramics for End Users II Conference, Publisher: SPRINGER, Pages: 295-301, ISSN: 1385-3449
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- Citations: 9
Record P, Popov C, Fletcher J, et al., 2007, Direct and converse magnetoelectic effect in laminate bonded Terfenol-D-PZT composites, Symposium on Functional Materials for Micro and Nanosystems, Publisher: ELSEVIER SCIENCE SA, Pages: 344-349
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- Citations: 36
Huang Z, Leighton G, Wright R, et al., 2007, Determination of piezoelectric coefficients and elastic constant of thin films by laser scanning vibrometry techniques, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 135, Pages: 660-665, ISSN: 0924-4247
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- Citations: 21
Leinvuo JT, Wilson SA, Whatmore RW, et al., 2007, A new flextensional piezoelectric ultrasonic motor - Design, fabrication and characterisation, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 133, Pages: 141-151, ISSN: 0924-4247
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- Citations: 18
Duval FFC, Wilson SA, Ensell G, et al., 2007, Characterisation of PZT thin film micro-actuators using a silicon micro-force sensor, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 133, Pages: 35-44, ISSN: 0924-4247
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- Citations: 23
Whatmore R, 2007, Ferroelectric Materials, Springer Handbooks, Pages: 597-623
Ferroelectric materials offer a wide range of useful properties. These include ferroelectric hysteresis (used in nonvolatile memories), high permittivities (used in capacitors), high piezoelectric effects (used in sensors, actuators and resonant wave devices such as radio-frequency filters), high pyroelectric coefficients (used in infra-red detectors), strong electro-optic effects (used in optical switches) and anomalous temperature coefficients of resistivity (used in electric-motor overload-protection circuits). In addition, ferroelectrics can be made in a wide variety of forms, including ceramics, single crystals, polymers and thin films – increasing their exploitability. This chapter gives an account of the basic theories behind the ferroelectric effect and the main ferroelectric material classes, discussing how their properties are related to their composition and the different ways they are made. Finally, it reviews the major applications for this class of materials, relating the ways in which their key functional properties affect those of the devices in which they are exploited.
Shaw CP, Whatmore RW, Alcock JR, 2007, Porous, functionally gradient pyroelectric materials, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 90, Pages: 137-142, ISSN: 0002-7820
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- Citations: 34
Zhang Q, Cordova S, Marshall JM, et al., 2007, Stress-induced phase formation of PZT 52/48 thin films, 18th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 85-+, ISSN: 1058-4587
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- Citations: 4
Corkovic S, Whatmore RW, Zhang Q, 2007, Sol-gel fabrication of PZT thick films for MEMS, 18th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 93-102, ISSN: 1058-4587
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- Citations: 9
Mischenko AS, Zhang Q, Whatmore RW, et al., 2006, Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9 PbMg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub>-0.1 PbTiO<sub>3</sub> near room temperature, APPLIED PHYSICS LETTERS, Vol: 89, ISSN: 0003-6951
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- Citations: 318
Liu G, Whatmore RW, 2006, A microcombustor coupled with a piezoelectric unimorph for power generation, Pages: 317-322
This article highlights the design of a unimorph for electric power generation and tested with two loading conditions. The unimorph comprises a piezoelectric ceramic bonded onto a steel disk, operating in d31 radial mode so that lateral stresses cause a charge difference through the thickness of the unimorph. The experimental methods of testing were, firstly to apply a uniformly distributed pressure pulse to the underside of the disk using compressed air. Secondly to couple the unimorph to a 5mm3 combustion chamber, and burning a stoichiometric mixture of H2:O2 metered at 5ml/min. Testing has caused the unimorph to deflect by up to 50μm and become stressed, in doing so generating electrical charge through the piezoelectric effect. Results have shown that milli-Watts of power can be generated with this configuration of piezoelectric unimorph. © The Institute of Engineering and Technology.
Rayner PJ, Wilson SA, Whatmore RW, et al., 2006, An automated performance testing system for piezoelectric micromotors, Pages: 231-236
The performance of micro-scale piezoelectric motors is characterised primarily in terms of their torque, speed and efficiency. In order to be meaningful these parameters must be measured concurrently and an effective test system is therefore essential for design, development, device optimisation and assessment of reliability. At the micro-scale, conventional methods of testing rotary motors, such as pulley brakes, are not easy to implement due to size constraints and the difficulty in measuring small dynamic forces. An automated method of testing a 5mm diameter flextensional ultrasonic motor has been created which derives performance measurements from the transient start up and stopping behaviour of the motor using a simple non-contact position encoder. The method gives full performance characteristics in less than a second and it is scaleable for use with other sizes and other types of motor. Furthermore, it provides a generic technique for non-contact measurements of position, angle or velocity that can be rapidly cycled as part of a development programme. The method has shown sufficient sensitivity, using basic components, to measure torque in the range 10-200μNm and speed in the range from 0 to over 2000rpm. The torque and speed ranges are only dependant on the sensitivity of encoder instrumentation, inertial load on the motor and data acquisition. This system is believed to be a significant improvement over previously-reported work and the test format has greater applicability for micro-motors that are used for their positioning capabilities.
Rayner PJ, Wilson SA, Whatmore RW, et al., 2006, An automated performance testing system for piezoelectric micromotors, Pages: 231-236
The performance of micro-scale piezoelectric motors is characterised primarily in terms of their torque, speed and efficiency. In order to be meaningful these parameters must be measured concurrently and an effective test system is therefore essential for design, development, device optimisation and assessment of reliability. At the micro-scale, conventional methods of testing rotary motors, such as pulley brakes, are not easy to implement due to size constraints and the difficulty in measuring small dynamic forces. An automated method of testing a 5mm diameter flextensional ultrasonic motor has been created which derives performance measurements from the transient start up and stopping behaviour of the motor using a simple non-contact position encoder. The method gives full performance characteristics in less than a second and it is scaleable for use with other sizes and other types of motor. Furthermore, it provides a generic technique for non-contact measurements of position, angle or velocity that can be rapidly cycled as part of a development programme. The method has shown sufficient sensitivity, using basic components, to measure torque in the range 10-200μNm and speed in the range from 0 to over 2000rpm. The torque and speed ranges are only dependant on the sensitivity of encoder instrumentation, inertial load on the motor and data acquisition. This system is believed to be a significant improvement over previously-reported work and the test format has greater applicability for micro-motors that are used for their positioning capabilities.
Liu G, Whatmore RW, 2006, A microcombustor coupled with a piezoelectric unimorph for power generation, Pages: 317-322
This article highlights the design of a unimorph for electric power generation and tested with two loading conditions. The unimorph comprises a piezoelectric ceramic bonded onto a steel disk, operating in d31 radial mode so that lateral stresses cause a charge difference through the thickness of the unimorph. The experimental methods of testing were, firstly to apply a uniformly distributed pressure pulse to the underside of the disk using compressed air. Secondly to couple the unimorph to a 5mm3 combustion chamber, and burning a stoichiometric mixture of H2:O2 metered at 5ml/min. Testing has caused the unimorph to deflect by up to 50μm and become stressed, in doing so generating electrical charge through the piezoelectric effect. Results have shown that milli-Watts of power can be generated with this configuration of piezoelectric unimorph. © The Institute of Engineering and Technology.
Huang Z, Zhang Q, Corkovic S, et al., 2006, Piezoelectric PZT films for MEMS and their characterization by interferometry, 2nd International Conference on Electroceramics (ICE-2005), Publisher: SPRINGER, Pages: 549-556, ISSN: 1385-3449
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- Citations: 9
Huang Z, Zhang Q, Corkovic S, et al., 2006, Comparative measurements of piezoelectric coefficient of PZT films by Berlincourt, interferometer, and vibrometer methods, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 53, Pages: 2287-2293, ISSN: 0885-3010
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- Citations: 26
Leinvuo JT, Wilson SA, Whatmore RW, et al., 2006, Flextensional ultrasonic piezoelectric micro-motor, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 53, Pages: 2357-2366, ISSN: 0885-3010
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- Citations: 8
Whatmore RW, 2006, Nanotechnology - what is it? Should we be worried?, OCCUPATIONAL MEDICINE-OXFORD, Vol: 56, Pages: 295-299, ISSN: 0962-7480
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- Citations: 27
Whatmore RW, 2006, Nanotechnology--what is it? Should we be worried?, Occup Med (Lond), Vol: 56, Pages: 295-299, ISSN: 0962-7480
This paper describes the origins of nanoscience from theoretical reasoning to its realization in terms of mechanical manipulation of atoms. The ability to visualize and manipulate matter at the nanoscale has led to a diverse technology that ranges from better and faster electronics and more efficient fuel usage to sensing, drug discovery and stronger, more resistant materials. It has the prospect of affecting the lives of all of us and already a number of applications are in the market-place. But in our development of these technologies, we need to take care to reduce the risks of the adverse consequences that usually attend new applications of science.
Mischenko AS, Zhang Q, Scott JF, et al., 2006, Giant electrocaloric effect in thin-film PbZr<sub>0.95</sub>Ti<sub>0.05</sub>O<sub>3</sub>, SCIENCE, Vol: 311, Pages: 1270-1271, ISSN: 0036-8075
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- Citations: 1307
Chima-Okereke C, Bushby AJ, Reece MJ, et al., 2006, Experimental, analytical, and finite element analyses of nanoindentation of multilayer PZT/Pt/SiO<sub>2</sub> thin film systems on silicon wafers, JOURNAL OF MATERIALS RESEARCH, Vol: 21, Pages: 409-419, ISSN: 0884-2914
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- Citations: 11
Mischenko AS, Zhang Q, Scott JF, et al., 2006, A new approach to interconversion of thermal and electrical energy, Pages: 1002-1003
New approaches to thermal management of electronic components are of general interest. Our work demonstrates a novel solution for this applications area. Highly effective thermal management solutions can potentially help the semiconductor manufacturers to reduce costs and meet some milestones of the Silicon Roadmap. For example, enormous amount of Joule heating and inability of the state-of-the art coolers to cope with it forces manufacturers to switch to dual-core architectures of processors. Also, our work might inspire a number of blue skies research projects in this particular field because it points to a relatively new approach broadens the scope of applications for ferroelectrics. We have observed [1,2] large cooling (electrocaloric) effects in thin films under the application of a small electrical voltage. This effect could also be used in reverse to turn low grade waste heat into electricity (pyroelectric energy conversion). In other words, we suggest a way to interconvert thermal end electrical energy. © 2006 IEEE.
Marshall JM, Corkovic S, Zhang Q, et al., 2006, The electromechanical properties of highly [100] oriented [Pb(Zr<sub>0.52</sub>Ti<sub>0.48</sub>)O<sub>3</sub>, PZT] thin films, 17th International Symposium on Integrated Ferroelectrics, Publisher: TAYLOR & FRANCIS LTD, Pages: 77-85, ISSN: 1058-4587
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- Citations: 9
Huang Z, Whatmore RW, 2005, A double-beam common path laser interferometer for the measurement of electric field-induced strains of piezoelectric thin films, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 76, ISSN: 0034-6748
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- Citations: 11
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