DIFFRACTION GROUP
Alan Hewat
Physicist, PhD
Instrument Scientitst (
D2B
)
e-mail:
hewat@ill.fr
Room:
201-ILL17
Phone:
+33 (0)4.76.20.
72.13
FAX:
+33 (0)4.76.20.76.48
D2B phone:
+33 (0)4.76.20.
71.43
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B.E.F. Fender and A.W. Hewat (1978), unpublished Rutherford Laboratory Report.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 Ba
2
YCu
3
O
7
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 BaYCu
3
O
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
0.4
Ca
13.6
Cu
24+y
O
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).