Imperial College London
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ProfessorRogerWhatmore

Faculty of Engineering, Department of Materials

Visiting Professor
 
 
 
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Contact

 

r.whatmore

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

343 results found

Beltrao PA, Gee AE, Corbett J, Whatmore RW, Goat CA, Impey SAet al., 1999, Single point diamond turning of ferroelectric materials, 29th Annual Conference of the UK Dielectrics-Society/4th UK Transducer Materials and Transducers Workshop, Publisher: GORDON BREACH SCI PUBL LTD, Pages: 229-239, ISSN: 0015-0193

Conference paper

Takeishi T, Whatmore RW, 1999, Low temperature sol gel deposition of PST (Pb(Sc<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub>) thin films, 29th Annual Conference of the UK Dielectrics-Society/4th UK Transducer Materials and Transducers Workshop, Publisher: GORDON BREACH SCI PUBL LTD, Pages: 53-60, ISSN: 0015-0193

Conference paper

Whatmore RW, Mahon S, 1999, Proceedings of the 29th Conference of the UK Dielectrics Society incorporating the 4th UK Transducer Materials and Transducers Workshop 6<SUP>th</SUP> to 9<SUP>th</SUP> April 1998 University of Kent at Canterbury, United Kingdom -: Guest editorial, FERROELECTRICS, Vol: 228, Pages: VII-VII, ISSN: 0015-0193

Journal article

Zhang Q, Huang Z, Vickers ME, Whatmore RWet al., 1999, Effect of the particle size in PZT precursor sols on the orientation of the thin films, ELECTROCERAMICS VI 98, Publisher: ELSEVIER SCI LTD, Pages: 1417-1421, ISSN: 0955-2219

Conference paper

Goat CA, Whatmore RW, 1999, The effect of grinding conditions on lead zirconate titanate machinability, ELECTROCERAMICS VI 98, Publisher: ELSEVIER SCI LTD, Pages: 1311-1313, ISSN: 0955-2219

Conference paper

Beltrao PA, Gee AE, Corbett J, Whatmore RW, Goat CA, Impey SAet al., 1999, Single point diamond machining of ferroelectric materials, ELECTROCERAMICS VI 98, Publisher: ELSEVIER SCI LTD, Pages: 1325-1328, ISSN: 0955-2219

Conference paper

Huang Z, Zhang Q, Whatmore RW, 1998, Role of an intermetallic phase on the crystallization of sol-gel prepared lead zirconate titanate thin films, IEEE International Symposium on Applications of Ferroelectrics, Pages: 151-154

Lead zirconate titanate (PZT) thin films have been prepared by a sol-gel method and been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). A metastable Pt3Pb intermetallic phase has been identified. Perovskite PZT was found to nucleate on top of the intermetallic phase. The improved lattice match between the intermetallic (a0 = 4.05 angstroms) and perovskite PZT (a0 = 4.035 angstroms) as compared to between Pt (a0 = 3.9231 angstroms) and the perovskite is believed to substantially reduce the activation energy for the nucleation of perovskite on Pt. Using this effect, (111) perovskite PZT has been grown at a temperature as low as 440 °C. The crystallization kinetics studies gave an activation energy of 179 kJ/mole for the phase transformation from pyrochlore to perovskite.

Journal article

Ricote J, Zhang Q, Whatmore RW, 1998, TEM investigation of rhombohedral PZT thin films, IEEE International Symposium on Applications of Ferroelectrics, Pages: 483-486

This work analyzes thin films of compositions within the rhombohedral phase of the lead zirconate titanate (PZT) system, and compares the results with previous reports on the structure and physical properties carried out on the same materials, but in the ceramic form. Irrespective of the special characteristics of thin films, the same structural features as in the ceramics were observed. This shows that the origin of the superlattice reflections is not related to a particular characteristic of the ceramic form, but to a fundamental aspect of the crystal structure. The influence of the domain configuration on the physical behaviour is also discussed and compared to the ceramic case.

Journal article

Zhang Q, Whatmore RW, Vickers ME, Huang Zet al., 1998, Structural studies on sols for PZT thin films, IEE Colloquium (Digest), ISSN: 0963-3308

Crack-free transparent thin films of ferroelectric Pb(Zr0.3, Ti0.7)O3 (PZT) with the perovskite structure were prepared by spin-coating a solution of complex alkoxides, followed by drying and then firing at the temperatures less than 500°C. The preparation of stock solution, drying, and firing of films was described. The coatings with selective orientations have been prepared by using selective processing parameters. The influence of low-temperature processing steps on texture development will be reported. The formation and growth of polymeric particles in the hydrolysis and condensation of PZT sol-gel precursor solutions have been investigated by using photon correlation spectroscopy (PCS), small angle x-ray scattering (SAXS) and by measuring their rheological properties. It has been possible to follow the growth of the particles in the sol by the different techniques used from initial values of <4nm up to ca 100nm. It has been shown that the particles are rods rather than spheres. The effects of particle shape and solution chemistry on the crystal phase formation and texture development will be discussed.

Journal article

Takeishi T, Whatmore RW, 1998, Low temperature sol gel synthesis of PST thin films, 2nd European Meeting on Integrated Ferroelectrics (EMIF2), Publisher: E D P SCIENCES, Pages: 57-60, ISSN: 1155-4339

Conference paper

Zhang Q, Whatmore RW, Huang Z, Vickers MEet al., 1998, Low temperature formation of sol-gel derived ferroelectric lead zirconate titanate (Pb(Zr<i><sub>x</sub></i>Ti<sub>1-<i>x</i></sub>)O<sub>3</sub>, <i>x</i> = 0.3) thin films, 2nd European Meeting on Integrated Ferroelectrics (EMIF2), Publisher: E D P SCIENCES, Pages: 79-82, ISSN: 1155-4339

Conference paper

Huang Z, Zhang Q, Whatmore RW, 1998, The role of an intermetallic phase on the crystallization of lead zirconate titanate in sol-gel process (vol 17, pg 1157, 1998), JOURNAL OF MATERIALS SCIENCE LETTERS, Vol: 17, Pages: 1865-1865, ISSN: 0261-8028

Journal article

Corker DL, Glazer AM, Whatmore RW, Stallard A, Fauth Fet al., 1998, A neutron diffraction investigation into the rhombohedral phases of the perovskite series PbZr<sub>1-x</sub>Ti<sub>x</sub>O<sub>3</sub>, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 10, Pages: 6251-6269, ISSN: 0953-8984

Journal article

Huang Z, Zhang Q, Whatmore RW, 1998, The role of an intermetallic phase on the crystallization of lead zirconate titanate in sol-gel process, JOURNAL OF MATERIALS SCIENCE LETTERS, Vol: 17, Pages: 1157-1159, ISSN: 0261-8028

Journal article

Zhang Q, Vickers ME, Patel A, Whatmore RWet al., 1998, Determination of particle size and shape during the hydrolysis of Pb(Zr<sub>0.3</sub>Ti<sub>0.7</sub>)O<sub>3</sub> precursor solutions, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, Vol: 11, Pages: 141-152, ISSN: 0928-0707

Journal article

Ricote J, Corker DL, Whatmore RW, Impey SA, Glazer AM, Dec J, Roleder Ket al., 1998, A TEM and neutron diffraction study of the local structure in the rhombohedral phase of lead zirconate titanate, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 10, Pages: 1767-1786, ISSN: 0953-8984

Journal article

Impey SA, Huang Z, Patel A, Beanland R, Shorrocks NM, Watton R, Whatmore RWet al., 1998, Microstructural characterization of sol-gel lead-zirconate-titanate thin films, JOURNAL OF APPLIED PHYSICS, Vol: 83, Pages: 2202-2208, ISSN: 0021-8979

Journal article

Corker DL, Glazer AM, Kaminsky W, Whatmore RW, Dec J, Roleder Ket al., 1998, Investigation into the crystal structure of the perovskite lead hafnate, PbHfO<sub>3</sub>, ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, Vol: 54, Pages: 18-28, ISSN: 0108-7681

Journal article

Zhang Q, Whatmore RW, Vickers ME, Patel Aet al., 1998, Characterization of particle structure in Pb(Zr<inf>0.3</inf>Ti<inf>0.7</inf>)O<inf>3</inf> sols, Journal of the Korean Physical Society, Vol: 32, ISSN: 0374-4884

The formation and growth of polymeric particles during the hydrolysis and condensation of PbZr0.3Ti0.7O3 (PZT 30/70) sol-gel precursor solutions have been investigated by using photon correlation spectroscopy (PCS), small angle x-ray scattering (SAXS) and by measuring their rheological properties. The measurements showed that the growth of the particles in the transition of PZT sol to gel followed a simple polymerisation process. A model for the form of the aggregates is discussed which is applicable to PZT organometal-particle aggregation process in systems with acetic acid as a modifier.

Journal article

Zhang Q, Whatmore RW, Vickers ME, Patel Aet al., 1998, Characterization of particle structure in Pb(Zr<sub>0.3</sub>Ti<sub>0.7</sub>)O<sub>3</sub> sols, 9th International Meeting on Ferroelectricity (IMF-9), Publisher: KOREAN PHYSICAL SOC, Pages: S572-S574, ISSN: 0374-4884

Conference paper

Huang Z, Zhang Q, Whatmore RW, 1998, Microstructural characterization of low temperature prepared sol-gel lead zirconate titanate thin films, 9th International Meeting on Ferroelectricity (IMF-9), Publisher: KOREAN PHYSICAL SOC, Pages: S1461-S1463, ISSN: 0374-4884

Conference paper

Wilson SA, Whatmore RW, 1998, Electric field structuring of piezoelectric composite materials, 9th International Meeting on Ferroelectricity (IMF-9), Publisher: KOREAN PHYSICAL SOC, Pages: S1204-S1206, ISSN: 0374-4884

Conference paper

Whatmore RW, Huang Z, Todd M, 1998, Sputtered lead scandium tantalate thin films:: Pb<SUP>4+</SUP> in B-sites in the perovskite structure, 9th International Meeting on Ferroelectricity (IMF-9), Publisher: KOREAN PHYSICAL SOC, Pages: S1718-S1720, ISSN: 0374-4884

Conference paper

Huang Z, Todd MA, Watton R, Whatmore RWet al., 1998, Sputtered lead scandium tantalate thin films: a microstructural study, JOURNAL OF MATERIALS SCIENCE, Vol: 33, Pages: 363-370, ISSN: 0022-2461

Journal article

Zhang Q, Whatmore RW, Vickers ME, Huang Zet al., 1998, Structural studies on sols for PZT thin films, ISSN: 0963-3308

Crack-free transparent thin films of ferroelectric Pb(Zr0.3,Ti0.7)O3 (PZT) with the perovskite structure were prepared by spin-coating a solution of complex alkoxides, followed by drying and then firing at the temperatures less than 500 °C. The preparation of stock solution, drying, and firing of films was described. The coatings with selective orientations have been prepared by using selective processing parameters. The influence of low-temperature processing steps on texture development will be reported. The formation and growth of polymeric particles in the hydrolysis and condensation of PZT sol-gel precursor solutions have been investigated by using photon correlation spectroscopy (PCS), small angle x-ray scattering (SAXS) and by measuring their rheological properties. It has been possible to follow the growth of the particles in the sol by the different techniques used from initial values of <4 nm up to ca 100 nm. It has been shown that the particles are rods rather than spheres. The effects of particle shape and solution chemistry on the crystal phase formation and texture development will be discussed.

Conference paper

Beltrao PA, Gee AE, Corbett J, Whatmore RW, Goat CA, Impey SAet al., 1998, "Ductile mode" machining of ferroelectric materials, 13th Annual Meeting of the American-Society-for-Precision-Engineering, Publisher: AMER SOC PRECISION ENGINEERING, Pages: 598-601

Conference paper

Gee AE, Beltrao PA, Corbett J, Whatmore RWet al., 1998, Linear frequency response testing of microservos using (non-linear) multifringe interferometric position measurement, 13th Annual Meeting of the American-Society-for-Precision-Engineering, Publisher: AMER SOC PRECISION ENGINEERING, Pages: 279-282

Conference paper

Whatmore RW, Huang Z, Todd M, 1997, Sputtered lead scandium tantalate thin films: Pb4+ in B sites in the perovskite structure, JOURNAL OF APPLIED PHYSICS, Vol: 82, Pages: 5686-5694, ISSN: 0021-8979

Journal article

Corker DL, Glazer AM, Dec J, Roleder K, Whatmore RWet al., 1997, A re-investigation of the crystal structure of the perovskite PbZrO3 by X-ray and neutron diffraction, ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, Vol: 53, Pages: 135-142, ISSN: 2052-5206

Journal article

Whatmore RW, 1997, From microengineering to nanotechnology, 3rd ESA Electronic Components Conference (EECC 97), Publisher: EUROPEAN SPACE AGENCY, Pages: 7-21, ISSN: 0379-6566

Conference paper

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