Dr David Walker
Dr David Walker
Platform Manager XRD RTP
D.Walker.2@warwick.ac.uk
+44 (0)2476 1 51299
XRD RTPLink opens in a new window
Research Interests
X-ray Diffraction, Crystallography, Electron Diffraction, MicroED, 3DED, XRF, SAXS, XAFS
Biography
David Walker is the facility manager for the X-ray Diffraction Research Technology Platform (RTP). He has 20 years' experience in X-ray scattering techniques with a background in crystallography and ferroelectric materials. David has managed the X-ray diffraction equipment at Warwick since 2008, with the RTP formally founded in 2014. He is responsible for training and assisting users from a wide spectrum of scientific backgrounds to use the equipment independently and interpret the X-ray data that they collect. David and his team have a strong track record of working with external companies and other higher education institutions to tackle challenging problems using X-ray scattering techniques. David is available to provide advice and support on all aspects of X-ray diffraction and scattering, but in particular High-resolution diffraction and Powder diffraction.
- Wratten, Ailish, Pain, Sophie L., Yadev, Anup, Khorani, Edris, Niewelt, Tim, Black, L., Bartholazzi, G., Walker, David, Grant, Nicholas E., Murphy, John D., 2023. Exploring hafnium oxide?s potential for passivating contacts for silicon solar cells. Solar Energy Materials and Solar Cells
- 'Hussein, Haytham E. M., 'Beanland, Richard, 'S?nchez, Ana M., 'Walker, David, 'Walker, Marc, 'Han, Yisong, 'Macpherson, Julie V., 2022. 'Atomic-scale investigation of the reversible ?- to ?-phase lithium ion charge ? discharge characteristics of electrodeposited vanadium pentoxide nanobelts. Journal of Materials Chemistry A, 10 (15), pp. 8515-8527
- 'Dintakurti, S. S. H., 'Walker, David, 'Bird, T. A., 'Fang, Yanan, 'White, T., 'Hanna, John V., 2022. 'A powder XRD, solid state NMR and calorimetric study of the phase evolution in mechanochemically synthesized dual cation (Csx(CH3NH3)1-x)PbX3 lead halide perovskite systems. Physical Chemistry Chemical Physics, 24 (30), pp. 18004-18021
- 'Wijesekara, Anjana, 'Walker, Marc, 'Han, Yisong, 'Walker, David, 'Huband, Steven, 'Hatton, Ross A., 2021. 'Enhanced stability of tin halide perovskite photovoltaics using a bathocuproine - copper top electrode. Advanced Energy Materials, 11 (48)
- 'Marshall, Jessica M., 'Walker, David, 'Thomas, Pam A., 2021. 'Non-ambient X-ray and neutron diffraction of novel relaxor ferroelectric x(Bi2(Zn2/3, Nb1/3)O7 ? (1-x)BaTiO3 (BZN-BT). Journal of Applied Crystallography, 54, pp. 1437-1454
- 'Manson, Jamie, 'Curley, Samuel P. M., 'Williams, Robert C., 'Walker, David, 'Goddard, Paul, 'Ozarowski, Andrew, 'Johnson, Roger D., 'Vibhakar, Anuradha, 'Villa, Danielle, 'Rhodehouse, Melissa, 'Birnbaum, Serena M., 'Singleton, John, 2021. 'Controlling magnetic anisotropy in a zero-dimensional S = 1 magnet using isotropic cation substitution. Journal of the American Chemical Society, 143 (12), pp. 4633-4638
- Marshall, Jessica M., Walker, David, Thomas, Pam A., 2020. Bismuth zinc niobate : BZN-BT, a new lead-free BaTiO3-based ferroelectric relaxor?. Journal of Advanced Dielectrics, 10 (6)
- Dowsett, M. G., Sabbe, Pieter-Jan, Alves Anjos, Jorge, Schofield, Eleanor J., Walker, David, Thomas, Pam A., York, Stephen J., Brown, Simon, Wermeille, Didier, Adriaens, Mieke, 2020. Synchrotron X-ray diffraction investigation of the surface condition of artefacts from King Henry VIII's warship the Mary Rose. Journal of Synchrotron Radiation, 27 (3)
- Qiu, Chaorui, Wang, Bo, Zhang, Nan, Zhang, Shujun, Liu, Jinfeng, Walker, David, Wang, Yu, Tian, Hao, Shrout, Thomas R, Xu, Zhuo, Chen, Long-Qing, Li, Fei, 2020. Transparent ferroelectric crystals with ultrahigh piezoelectricity. Nature, 577 (7790), pp. 350-354
- 'Corlett, Emily K., 'Blade, Helen, 'Hughes, Leslie P., 'Sidebottom, Philip J., 'Walker, David, 'Walton, Richard I., 'Brown, Steven P., 2020. '5-amino-2-methylpyridinium hydrogen fumarate : an XRD and NMR crystallography analysis. Magnetic Resonance in Chemistry, 58 (11), pp. 1026-1035
- 'Marshall, Jessica M., 'Walker, David, 'Thomas, Pam A., 2020. 'HRXRD study of the theoretical densities of novel reactive sintered boride candidate neutron shielding materials. Journal of Nuclear Materials and Energy, 22
- 'Corlett, Emily K., 'Blade, Helen, 'Hughes, Leslie P., 'Sidebottom, Philip J., 'Walker, David, 'Walton, Richard I., 'Brown, Steven P., 2020. 'Investigating discrepancies between experimental solid-state NMR and GIPAW calculation : N=C?N13C and OH?O1H chemical shifts in pyridinium fumarates and their cocrystals. Solid State Nuclear Magnetic Resonance, 108
- Peters, Jonathan J. P., Sanchez, Ana M., Walker, David, Whatmore, Roger, Beanland, R., 2019. Quantitative high-dynamic-range electron diffraction of polar nanodomains in Pb2 ScTaO6. Advanced Materials, 31 (5)
- Corlett, Emily K., Blade, Helen, Hughes, Leslie P., Sidebottom, Philip J., Walker, David, Walton, Richard I., Brown, Steven P., 2019. An XRD and NMR crystallographic investigation of the structure of 2,6-lutidinium hydrogen fumarate. CrystEngComm, 21 (22), pp. 3502-3516
- Marshall, Kenneth P., Tao, Shuxia, Walker, Marc, Cook, Daniel Sean, Lloyd-Hughes, James, Varagnolo, Silvia, Wijesekara, Anjana, Walker, David, Walton, Richard I., Hatton, Ross A., 2018. Cs1-xRbxSnI3 light harvesting semiconductors for perovskite photovoltaics. Materials Chemistry Frontiers, 2 (8), pp. 1515-1522
- Osman, Ahmed I., Abu-Dahrieh, Jehad K., Cherkasov, Nikolay, Fernández-García, Javier, Walker, David, Walton, Richard I., Rooney, David W., Rebrov, Evgeny, 2018. A highly active and synergistic Pt/Mo 2 C/Al 2 O 3 catalyst for water-gas shift reaction. Molecular Catalysis, 455, pp. 38-47
- Zhao, Jinyan, Zhang, Nan, Ren, Wei, Niu, Gang, Walker, David, Thomas, Pam A., Wang, Lingyan, Ye, Zuo-Guang, 2018. Polar domain structural evolution under electric field and temperature in the (Bi0.5 Na0.5)TiO3 -0.06BaTiO3 piezoceramics. Journal of the American Ceramic Society, 102 (1), pp. 437-447
- Linhart, Wojciech W.M., Rajpalke, Mohana M.K., Birkett, Max, Walker, David, Ashwin, M. J., Veal, T. D., 2018. Nitrogen pair-induced temperature insensitivity of the band gap of GaNSb alloys. Journal of Physics D: Applied Physics, 52 (4)
- Bai, Yang, Cherkasov, Nikolay, Huband, Steven, Walker, David, Walton, Richard I., Rebrov, Evgeny V., 2018. Highly selective continuous flow hydrogenation of cinnamaldehyde to cinnamyl alcohol in a Pt/SiO2 coated tube reactor. Catalysts, 8 (2)
- Zhuang, Jian, Bokov, Alexei A., Zhang, Nan, Walker, David, Huo, Siqi, Zhang, Jie, Ren, Wei, Ye, Zuo-Guang, 2018. Impact of quenched random fields on the ferroelectric-to-relaxor crossover in the solid solution (1-x)BaTiO3-xDyFeO3. Physical Review B (Condensed Matter and Materials Physics), 98 (17)
- Wang, Jiabin, Zhang, Han, Hunt, Michael R. C., Charles, Alasdair, Tang, Jie, Bretcanu, Oana, Walker, David, Hassan, Khalil T., Sun, Yige, ?iller, Lidija, 2017. Synthesis and characterisation of reduced graphene oxide/bismuth composite for electrodes in electrochemical energy storage devices. ChemSusChem, 10 (2), pp. 363-371
- Poeppler, Ann-Christin, Walker, David, Brown, Steven P., 2017. A combined NMR crystallographic and PXRD investigation of the structure-directing role of water molecules in orotic acid and its lithium and magnesium salts. CrystEngComm, 19 (2), pp. 224-236
- Li, Fan, Sharma, Yogesh K., Walker, David, Hindmarsh, Steven A., Jennings, Michael, Martin, David, Fisher, Craig A., Gammon, P. M., Pérez-Tomás, Amador, Mawby, P. A., 2016. 3C-SiC transistor with Ohmic contacts defined at room temperature. IEEE Electron Device Letters
- Hamilton, Dean P., Hindmarsh, Steven A., York, Stephen J., Walker, David, Russell, Stephen, Jennings, M. R., Fisher, Craig A., Mawby, P. A. (Philip A.), 2016. Ohmic contact reliability of commercially available SiC MOSFETs isothermally aged for long periods at 300°C in air. Materials Science Forum, 858, pp. 557-560
- Richards, Robert D., Bastiman, Faebian, Roberts, John S., Beanland, R., Walker, David, David, John P. R., 2015. MBE grown GaAsBi/GaAs multiple quantum well structures : structural and optical characterization. Journal of Crystal Growth, 425, pp. 237-240
- Doig, K. I., Peters, Jonathan J. P., Nawaz, Seeraz, Walker, David, Walker, Marc, Lees, Martin R., Beanland, R., Sanchez, Ana M., McConville, C. F., Palkar, V. R., Lloyd-Hughes, James, 2015. Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1-xFex)nO3n+1-d Ruddlesden-Popper superstructures. Scientific Reports, 5, pp. 1-10
- Hassan, A. H. A., Morris, R. J. H. (Richard J. H.), Mironov, O. A., Beanland, R., Walker, David, Huband, Steven, Dobbie, A. (Andrew), Myronov, Maksym, Leadley, D. R. (David R.), 2014. Anisotropy in the hole mobility measured along the [110] and [110] orientations in a strained Ge quantum well. Applied Physics Letters, 104 (13)
- Wildemeersch, Dirk, Sabbe, Pieter-Jan, Dowsett, M. G., Flexer, Victoria, Thompson, Paul, Walker, David, Thomas, Pam A., Adriaens, Annemie, 2014. Assessment of copper corrosion from frameless copper IUDs after long-term in utero residence. Contraception, 90 (4), pp. 454-459
- Jennings, M. R., Fisher, Craig A., Walker, David, Sánchez, Ana M., Pérez-Tomás, Amador, Hamilton, Dean P., Gammon, P. M., Burrows, S. E. (Susan E.), Thomas, Stephen M., Sharma, Yogesh K., Li, Fan, Mawby, P. A. (Philip A.), 2014. On the Ti3SiC2 metallic phase formation for robust p-type 4H-SiC ohmic contacts. Materials Science Forum, 778-780, pp. 693-696
- Woodward, David I., Dittmer, Robert, Jo, Wook, Walker, David, Keeble, Dean Samuel, Dale, Matthew W., Rödel, Jürgen, Thomas, Pam A., 2014. Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics. Journal of Applied Physics, 115 (11)
- Vasta, Giuseppe, Feteira, Antonio, Woodward, David I., Walker, David, Thomas, Pam A., Jackson, Timothy J., 2013. Thin film LaYbO3 capacitive structures grown by pulsed laser deposition. Thin Solid Films, 527, pp. 81-86
- Gupta, Shashaank, Huband, Steven, Keeble, Dean Samuel, Walker, David, Thomas, Pam A., Viehland, Dwight, Priya, Shashank, 2013. Optical crystallographic study of piezoelectric KxNa1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence. CrystEngComm, 15 (34), pp. 6790-6799
- Ashwin, M. J., Walker, David, Thomas, Pam A., Jones, T. S., Veal, T. D., 2013. N incorporation in GaInNSb alloys and lattice matching to GaSb. Journal of Applied Physics, 113 (3)
- Ashwin, M. J., Morris, R. J. H., Walker, David, Thomas, Pam A., Dowsett, M. G., Jones, T. S., Veal, T. D., 2013. Molecular-beam epitaxy and lattice parameter of GaNxSb1-x : deviation from Vegard's law for x>0.02. Journal of Physics D: Applied Physics, 46 (26)
- Jennings, M. R., Pérez-Tomás, Amador, Bashir, A., Sánchez, Ana M., Severino, A., Ward, Peter J., Thomas, S. M., Fisher, Craig A., Gammon, P. M., Zabala, M., Burrows, S. E., Donnellan, B., Hamilton, D. P., Walker, David, Mawby, P. A., 2012. Bow free 4'' diameter 3C-SiC Epilayers formed upon wafer-bonded Si/SiC substrates. ECS Solid State Letters, 1 (6), pp. P85-P88
- Dowsett, M. G., Morris, R. J. H., Hand, M., Grigg, A. T., Walker, David, Beanland, R., 2011. The influence of beam energy on apparent layer thickness using ultralow energy O2+ SIMS on surface Si1-xGex. Surface and Interface Analysis, Vol.43 (No.1-2), pp. 211-213
- Kowalczyk, Radoslaw M., Kemp, Thomas F., Walker, David, Pike, Kevin J., Thomas, Pam A., Kreisel, J., Dupree, Ray, Newton, Mark E., Hanna, John V., Smith, Mark E., 2011. A variable temperature solid-state nuclear magnetic resonance, electron paramagnetic resonance and Raman scattering study of molecular dynamics in ferroelectric fluorides. Journal of Physics: Condensed Matter, Vol.23 (No.31)
- Lethbridge, Zoe A. D., Keeble, Dean Samuel, Walker, David, Thomas, Pam A., Walton, Richard I., 2010. An investigation of the properties of large crystals of the zeolites dodecasil-3C and ferrierite by high-temperature birefringence microscopy and X-ray diffraction. Journal of Applied Crystallography, Vol.43 (No.1), pp. 168-175
- Sloyan, Katherine A., May-Smith, Timothy C., Zervas, Michalis, Eason, Robert W., Huband, Steven, Walker, David, Thomas, Pam A., 2010. Growth of crystalline garnet mixed films, superlattices and multilayers for optical applications via shuttered Combinatorial Pulsed Laser Deposition. Optics Express, Vol.18 (No.24)
- De Wael, Karolien, De Keersmaecker, Michel, Dowsett, M. G., Walker, David, Thomas, Pam A., Adriaens, A., 2010. Electrochemical deposition of dodecanoate on lead in view of an environmentally safe corrosion inhibition. Journal of Solid State Electrochemisty, Vol.14 (No.3), pp. 407-413
- Datta, K., Walker, David, Thomas, Pam A., 2010. Structural investigations of the bismuth scandate-lead titanate xBiScO3-(1-x) PbTiO3 solid solution for 0.10 <= x <= 0.40. Physical Review B (Condensed Matter and Materials Physics), Vol.82 (No.14)
- Walker, David, Thomas, Pam A., Collins, Steve R., 2009. A comprehensive investigation of the structural properties of ferroelectric PbZr0.2Ti0.8O3 thin films grown by PLD. Physica Status Solidi. A: Applications and Materials Science, Vol.206 (No.8 Sp. Iss. SI), pp. 1799-1803
- Rutkowska, Agnieszka, Walker, David, Gorfman, S., Thomas, Pam A., Macpherson, Julie V., 2009. Horizontal alignment of chemical vapor-deposited SWNTs on single-crystal quartz surfaces : further evidence for epitaxial alignment. Journal of Chemistry C, Vol.113 (No.39), pp. 17087-17096
- Buckle, L., Coomber, S. D., Ashley, Tim, Jefferson, Paul Harvey, Walker, David, Veal, T. D., McConville, C. F., Thomas, Pam A., 2009. Growth and characterisation of dilute antimonide nitride materials for long-wavelength applications. Microelectronics Journal, Vol.40 (No.3 Sp. Iss. SI), pp. 399-402
- Jennings, M. R., Pérez-Tomás, Amador, Davies, M., Walker, David, Zhu, L., Losee, P., Huang, W., Balachandran, S., Guy, O. J., Covington, James A., Chow, T. P., Mawby, P. A., 2007. Analysis of Al/Ti, Al/Ni multiple and triple layer contacts to p-type 4H-SiC. Solid-State Electronics, Vol.51 (No.5), pp. 797-801
- Marshall, Jessica M., Walker, David, Thomas, Pam A., Dobedoe, R. S., Ren, Z., Yu, S., 2007. Comparison of LiNbO3 flux systems for deposition on RIE-etched LiTaO3 substrates. Journal of Physics D: Applied Physics, 40 (23), pp. 7480-7484
- Jefferson, P. H., Buckle, L., Walker, David, Veal, T. D., Coomber, S., Thomas, Pam A., Ashley, T., McConville, C. F., 2007. Growth and characterisation of high quality MBE grown InNxSb1-x. physica status solidi (RRL) ? Rapid Research Letters, Vol.1 (No.3), pp. 104-106
- Jefferson, P. H., Buckle, L., Bennett, B. R., Veal, T. D., Walker, David, Wilson, Neil R., Piper, L. F. J., Thomas, Pam A., Ashley, T., McConville, C. F., 2007. Growth of dilute nitride alloys of GaInSb lattice-matched to GaSb. Journal of Crystal Growth, Vol.304 (No.2), pp. 338-341
- Walker, David, Thomas, Pam A., Pernot-Rejmankova, P., Baruchel, J., 2007. In situ investigation of the non-linear optical crystal rubidium titanyl arsenate, RbTiOAsO4, under applied electric field using X-ray imaging. Journal of Applied Crystallography, Vol.40 (No.3), pp. 505-512