Alan Hewat

Co-responsible for D2B

Research interests: Inorganic Structural Chemistry, especially:

• Neutron powder diffraction.
• Oxide superconductors, charge order, phase transitions etc.
• Computer graphics ( 3D-crystals) and databases (ICSD-for-WWW)

Important publications (among 200+ published papers) and recent lectures (in Acrobat PDF format):

• Hewat, A. W. (1973) UKAEA Research Group Report R7350. The Rietveld computer program… modified for anisotropic thermal vibration.
• Hewat, A. W. (1973) Nature (London) 246, 90-1. Location of hydrogen atoms… by neutron powder profile refinement.
• Hewat, A. W. and Bailey, I. (1976) Nucl. Instrum. Methods 137, 463-71. D1A, a high resolution neutron powder diffractometer with a bank of mylar collimators.
• B.E.F. Fender and A.W. Hewat (1978), unpublished Rutherford Laboratory Report. A High Resolution SNS Powder Diffractometer.
• Hewat, A. W. (1986) Mat. Sci. Forum 9, 69-79. D2B, a new high resolution powder diffractometer at ILL Grenoble.
• Capponi, J. J., Chaillout, C., Hewat, A. W., Lejay, P., Marezio, M., Nguyen, N., Raveau, B., Soubeyroux, J. L., Tholence, J. L. and Tournier, R. (1987) Europhys.Lett. 3, 1301. Structure of the 100 K Superconductor Ba₂YCu₃O₇ between (5-300) K...
• Cava, R. J., Hewat, A. W., Hewat, E. A., Batlogg, B., Marezio, M., Rabe, K. M., Krajewski, J. J., Peck, W. F. and Rupp, L. W. (1990) Physica C. 165, 419. Structural anomalies, oxygen ordering and superconductivity in oxygen deficient BaYCu₃O_x. (620K)
• Isobe, M., Onoda, M., Ohta, T., Izumi, F., Kimoto, K., Takayayama-Muromachi, E., Hewat, A.W. & Ohoyama, K. (2000) Phys. Rev. B. 62, 11667. Low-Temperature Crystal and Magnetic Structures of the Chain-Ladder Composite Material Sr_0.4Ca_13.6Cu_24+yO_41+z: Hole-Redistribution and Antiferromagnetic order.

Curriculum Vitae …and the first Dr A. Hewat (1739-1824)

• Married to Dr Elizabeth A. Hewat (children: Dr Alison H., Marcus H., Peter H.)

• 1970 Kernot Prize, Melbourne. “Lattice Dynamics of ZnO and ZnS”
• 1970-1973 Research Fellow, UKAEA Harwell, UK (introduced Rietveld Method).
• 1973-1976 Research Scientist, ILL Grenoble (constructed D1A diffractometer).
• 1976- Staff Scientist, ILL Grenoble (appointed by R.L. Mossbauer).
• 1983-1984 Detached to EPSRC, ISIS lab., Oxon. UK. (participated in HRPD design). Constructed D2B high resolution powder diffractometer.
• 1986 Ph.D. Chemistry Honoris Causa, Uppsala, Sweden).
• 1987-1990 Superconductor competition (helped produce ILL’s most cited papers).
• 1993-2005 Diffraction Group Leader (one of the two largest ILL groups).