个人简介

NSF CAREER award, 1996; Sigma Xi award for outstanding research by a junior faculty member, 1996; Linus Pauling Prize, awarded by the American Crystallographic Association, 1991.

研究领域

Characterization/Inorganic Chemistry/Materials Chemistry/Physical Chemistry/Synthesis/Theory and Modeling

Low and Negative Thermal Expansion (NTE) Materials. Most materials expand as they are heated, but there is a growing group of compounds that shrink on heating (display negative thermal expansion). Such materials are of potential use in composites as blending both negative and positive thermal expansion compounds provides a way of tailoring the thermal expansion characteristics of the resulting material. Being able to tailor the thermal expansion characteristics is useful as there are many applications where either zero thermal expansion is desirable (e.g. optical devices where accurate positioning or maintenance of shape is crucial) or there is a need to match the thermal expansion coefficients of two parts that are bonded together. We are currently working on materials from several structural families that have the potential to show either NTE or low TE. This work includes fundamental studies of oxides, oxyfluorides and fluorides. We are particularly interested in the role that structural disorder plays in controling physical properties and the effect of pressure, and more generally stress, on materials performance. Our studies involve synthetic work at Georgia Tech, neutron scattering at the HFIR and SNS facilities, x-ray scattering experiments at the Advanced Photon Source (APS), and collaboration with other groups to measure and understand relevant materials characteristics. Our work on metal fluorides is in part motivated by the opportunity to develop optical materials that are insensitive to temperature fluctuations and are transparent over a wide range of wavelengths into the IR. New Applications of Synchrotron X-ray Methods. We are actively enagaged in the development of methods and special sample environments for synchrotron X-ray diffraction studies of materials. The extremely high intensity and high-energy X-ray beams that are available from third generation synchrotron sources provide unique opportunities in this arena. In recent years we have developed special sample environments for the examination of thermal expansion while while are under pressure, the in-situ study of cement hydration at the high pressures and temperatures characteristic of deep oil wells, and the simultaneous examination of oil well cement hydration by utrasonic reflection rheometry and x-ray diffraction. We also have along standing interest in the use of resonant , or anomalous, scattering x-ray methods to better understand material's structure.

近期论文

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History-dependent thermal expansion in NbO2F. A. P. Wilkinson, R. E. Josefsberg, L. C. Gallington, C. R. Morelock and C. M. Monaco J. Solid State Chem.. 2014, 213, 38-42. Evolution of negative thermal expansion and phase transitions in Sc1-xTixF3. C.R. Morelock, L.C. Gallington, A.P. Wilkinson Chem. Mater.. 2014, 26, 1936-1940. Dramatic softening of the negative thermal expansion material HfW2O8 upon heating through its WO4 orientational order-disorder phase transition. L.C. Gallington, K.W. Chapman, C.R. Morelock, P.J. Chupas and A.P. Wilkinson J. Appl. Phys.. 2014, 115, 053512:(5). Thermal expansion and phase transitions of α-AlF3. Morelock, C.R., Hancock, J.C., Wilkinson, A.P. J. Solid State Chem.. 2014, 219, 143-147. Role of Anion Site Disorder in the Near Zero Thermal Expansion of Tantalum Oxyfluoride". Chem. Mater., 25, 1900-1904 (2013).. C.R. Morelock, B.K. Greve, M. Cetinkol, K.W. Chapman, P.J. Chupas, A.P. Wilkinson Chem. Mater.. 2013, 25, 1900-1904.. cautionary tale on the use of GE-7031 varnish: Low temperature thermal expansion studies of ScF3. C.R. Morelock, M.R. Suchomel, A.P. Wilkinson J. Appl. Cryst.. 2013, 46, 823-825. Negative thermal expansion and compressibility of Sc1-xYxF3 (x < 0.25). Cody R. Morelock, Benjamin K. Greve, Leighanne C. Gallington, Karena W. Chapman, and Angus P. Wilkinson J. Appl. Phys.. 2013, 114, 213501. Orientational order-dependent thermal expansion and compressibility of ZrW2O8 and ZrMo2O8. L.G. Gallington. K. W. Chapman, C.R. RMorelock, P.J. Chupas and A.P. Wilkinson Phys. Chem. Chem. Phys.. 2013, 15, 19665 - 19672. The effect of pressure on tricalcium silicate hydration at different temperatures and in the presence of retarding additives. A.C. Jupe, A.P. Wilkinson, G.P. Funkhouser Cem.Concr. Res.. 2012, 42, 1083-1087. Simultaneous study of mechanical property development and early hydration chemistry in Portland cement slurries using X-ray diffraction and ultrasound reflection. A.C. Jupe, A.P. Wilkinson, G.P. Funkhouser Cem. Concr. Res.. 2012, 42, 1166-1173. Pressure induced amorphization of ZrMo2O8 and its relaxation on decompression as seen by in situ total x-ray scattering. A.P. Wilkinson, B.K. Greve, C.J. Ruschman, K.W. Chapman, P.J. Chupas J.Appl. Phys.. 2012, 112, 023511-6. Delineating Mechanisms of Upconversion Enhancement by Li+ Codoping in Y2SiO5:Pr3+. E.L. Cates, A.P. Wilkinson, J.-H. Kim J. Phys. Chem. C. 2012, 116, 12772-12778. Oil well cement and C3S hydration under high pressure as seen by in-situ x-ray diffraction; Temperatures ≤ 80°C with no additives. A.C. Jupe, A.P. Wilkinson, and G.P. Funkhouser J. Am. Ceram. Soc.. 2011, 94, 1591-1597. Reducing the background from pressure vessels using a BRIM. B. K. Greve, A. C. Jupe, K. W. Chapman, P. J. Chupas, C. Kurtz J. Appl. Crystllogr.. 2011, 44, 1047-1053. Pronounced Negative Thermal Expansion from a Simple Structure: Cubic ScF3. B. K. Greve, K. L. Martin, P. L. Lee, P. J. Chupas, K. W. Chapman, and A. P. Wilkinson J. Am. Chem. Soc.. 2010, 132, 15496-15498. Optimising high pressure pair distribution function measurements in diamond anvil cells. K. W. Chapman, P. J. Chupas, G. J. Halder, J. A. Hriljac, C. Kurtz, B. K. Greve, C. J. Ruschman, and A. P. Wilkinson J. Appl. Crystallogr.. 2010, 43, 297-307. Structural changes accompanying negative thermal expansion in Zr2(MoO4)(PO4)2. M. C. Cetinkol, A. P. Wilkinson and P. L. Lee J. Solid State Chem.. 2009, 182, 1304-1311. Pressure Dependence of Negative Thermal Expansion in Zr2(WO4)(PO4)2. M. Cetinkol and A. P. Wilkinson Solid State Commun.. 2009, 149, 421-424. In situ high-pressure synchrotron x-ray diffraction study of Zr2(WO4)(PO4)2 up to 16 GPa. M. Cetinkol, A. P. Wilkinson and C. Lind Phys. Rev. B. 2009, 79, 224118-10. Zirconium coordination change upon the pressure-induced amorphization of cubic ZrW2O8 and ZrMo2O8. T. Varga and A. P. Wilkinson Phys. Rev. B. 2009, 79, 224119-5.