Current and former group members

Current group members

 

Graduate Students

Cody R. Morelock

Cody is a native of Kingsport, Tennessee, and graduated magna cum laude from Furman University (Greenville, SC) in 2009 with a Bachelor of Science in chemistry. Cody's PhD thesis work focused on thermal expansion in the ReO3 structural family (fluorides and oxyfluorides) and the effects of disorder and stress on thermal expansion.

To date, here are Cody's publications with the group, both first-author and otherwise:

1) "Thermal expansion and phase transitions of α-AlF3." Morelock, C. R.; Hancock, J. C.; Wilkinson, A. P. Journal of Solid State Chemistry, 219, 143-147 (2014). http://dx.doi.org/10.1016/j.jssc.2014.07.031
2) "Evolution of negative thermal expansion and phase transitions in Sc1-xTixF3." Morelock, C. R.; Gallington, L. C.; Wilkinson, A. P. Chemistry of Materials, 26, 1936-1940 (2014). http://dx.doi.org/10.1021/cm5002048

3) "History-dependent thermal expansion in 'NbO2F'." Wilkinson, A. P.; Josefsberg, R. E.; Gallington, L. C.; Morelock, C. R.; Monaco, C. M. Journal of Solid State Chemistry, 213, 38 (2014). http://dx.doi.org/10.1016/j.jssc.2014.02.003
4) "Dramatic softening of the negative thermal expansion material HfW2O8 upon heating through its WO4 orientational order-disorder phase transition." Gallington, L. C.; Chapman, K. W.; Morelock, C. R.; Chupas, P. J.; Wilkinson, A. P. Journal of Applied Physics, 115, 053512 (2014). http://dx.doi.org/10.1063/1.4864258
5) "Negative thermal expansion and compressibility of Sc1-xYxF3 (x 0.25)." Morelock, C. R.; Greve, B. K.; Gallington, L. C.; Chapman, K. W.; Wilkinson, A. P. Journal of Applied Physics, 114, 213501 (2013). http://dx.doi.org/10.1063/1.4836855
6) "Orientational Order-Dependent Thermal Expansion and Compressibility of ZrW2O8 and ZrMo2O8." Gallington, L. C.; Chapman, K. W.; Morelock, C. R.; Chupas, P. J.; Wilkinson, A. P. Physical Chemistry Chemical Physics, 15, 19665-19672 (2013). http://dx.doi.org/10.1039/c3cp52876f
7) "Role of Anion Site Disorder in the Near Zero Thermal Expansion of Tantalum Oxyfluoride." Morelock, C. R.; Greve, B. K.; Cetinkol, M.; Chapman, K. W.; Chupas, P. J.; Wilkinson, A. P. Chemistry of Materials, 25, 1900-1904 (2013). http://dx.doi.org/10.1021/cm400536n
8) "A cautionary tale on the use of GE-7031 varnish: Low temperature thermal expansion studies of ScF3." Morelock, C. R.; Suchomel, M. R.; Wilkinson, A. P. Journal of Applied Crystallography, 46, 823-825 (2013). http://dx.doi.org/10.1107/S0021889813005955
9) "Reducing the background from pressure vessels using a BRIM." Wilkinson, A. P.; Morelock, C. R.; Greve, B. K.; Jupe, A. C.; Chapman, K. W.; Chupas, P. J.; Kurtz, C. Journal of Applied Crystallography, 44, 1047-1053 (2011). http://dx.doi.org/10.1107/S0021889811028925

 
Leighanne C. Gallington

Leighanne grew up in Boston, MA and graduated from MIT in 2006 with an SB in Course V (Chemistry).  Leighanne enrolled in the School of Chemistry and Biochemistry Ph.D program at Georgia Tech in 2009 and joined the Wilkinson group in November 2010.  Her current research focuses on thermal expansion of some members of the zirconium tungstate, zirconium pyrophosphate, and rhenium trioxide families.

Leighanne's publications with the group include:

1) “Dramatic softening of the negative thermal expansion material HfW2O8 upon heating through its WO4 orientational order-disorder phase transition.” Gallington LC, Chapman KW, Morelock CR, Chupas PJ, Wilkinson AP.  Journal of Applied Physics, 115, 053512 (2014). doi:10.1063/1.4864258
2)
“Orientational Order-Dependent Thermal Expansion and Compressibility of ZrW2O8 and ZrMo2O8."  Gallington LC, Chapman KW, Morelock CR, Chupas PJ, Wilkinson AP.  Phys. Chem. Chem. Phys. 15, 19665-19672 (2013). doi:10.1039/C3CP52876F

 


Benjamin S. Kaplan

Ben is a second-year graduate student. He received a B. S. degree in chemistry and B. A. in applied mathematics from Syracuse University (2013).


Brett R. Hester

Brett is a second-year graduate student. He received a B. S. degree in chemistry from Clemson University (2013).

 

 

Undergraduate Students

 

 

Former group members

 

Ph.D graduates

Benjamin K. Greve

Ben's doctoral thesis work focused on the preparation and properties, particularly thermal expansion, of fluorides and oxyfluorides with a rhenium trioxide type structure. After leaving Georgia Tech in December 2011, he moved to Colorado to start a postdoctoral position with Robin Macaluso at the University of North Colorado.

Publication arising from Ben's work at GT include:

1) "Reducing the background from pressure vessels using a BRIM", A.P. Wilkinson, C.R. Morelock, B.K. Greve, A.C. Jupe, K.W. Chapman, P.J. Chupas, C. Kurtz. J. Appl. Crystallogr., 44, 1047-1053 (2011). http://dx.doi.org/10.1107/S0021889811028925

2) "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, A.P. Wilkinson. J. Am. Chem. Soc., 132, 15496-15498 (2010). http://dx.doi.org/10.1021/ja106711v

3) "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, A.P. Wilkinson. J. App. Cryst., 43, 297-307 (2010). http://dx.doi.org/10.1107/S0021889811028925

Mehmet Cetinkol

Publication arising from Mehmet's work at GT include:

(1) "In situ high-pressure synchrotron x-ray diffraction study of Zr2(WO4)(PO4)2 up to 16 GPa" M. Cetinkol, A.P. Wilkinson, C. Lind, Phys. Rev. B 79, 224118-10 (2009). http://dx.doi.org/10.1103/PhysRevB.79.224118

(2) "Structural changes accompanying negative thermal expansion in Zr2(MoO4)(PO4)2" M. Cetinkol, A.P. Wilkinson, P.L. Lee, J. Solid State Chem. 182, 1304-1311 (2009). http://dx.doi.org/10.1016/j.jssc.2009.02.029

(3) "Pressure Dependence of Negative Thermal Expansion in Zr2(WO4)(PO4)2" M. Cetinkol, A.P. Wilkinson, Solid State Commun. 149, 421-424 (2009). http://dx.doi.org/10.1016/j.ssc.2009.01.002

(4) "Scandium tungstate above 2.5 GPa" M. Cetinkol, A.P. Wilkinson, K.W. Chapman, Solid State Commun. 148, 511-515 (2008). http://dx.doi.org/10.1016/j.ssc.2008.10.002

(5) "High-pressure powder diffraction study of TaO2F" M. Cetinkol, A.P. Wilkinson, C. Lind, W.A. Bassett, C.-S. Zha, J. Phys. Chem. Solids 68, 611-616 (2007). http://dx.doi.org/10.1016/j.jpcs.2007.01.053

(6) "Preparation and characterization on In(I)-b"-alumina" M. Cetinkol, P.L. Lee, A.P. Wilkinson, Mater. Res. Bull. 42, 713-719 (2007). http://dx.doi.org/10.1016/j.materresbull.2006.07.015

Kathy M. White

Kathy's research at Tech focused on the thermal expansion properties of pyrophosphates of the type M(IV)P2O7 and M(III)0.5M'(V)0.5 P2O7. Some of these materials display negative thermal expansion at high temperature for example CeP2O7. After graduation, Kathy joined the Savannah River National Laboratory as a staff scientist.

Publication arising from Kathy's work at GT include:

(1) "Synthesis, Symmetry, and Physical Properties of Cerium Pyrophosphate" K.M. White, P.L. Lee, P.J. Chupas, K.W. Chapman, E.A. Payzant, A.C. Jupe, W.A. Bassett, C.S. Zha, A.P. Wilkinson, Chem. Mater. 20, 3728-3734 (2008). http://dx.doi.org/10.1021/cm702338h

Tamas Varga

Tamas' PhD work at Georgia Tech focused on oxides displaying negative thermal expansion, particularly their behavior under pressure. After graduation in 2005, Tamas whent to work, on the thermochemistry of negative thermal expansion materials and amorphous ceramics, as a postdoc with Alex Navrostky's group at UC Davis. He then moved to Argonne National Laboratory to work with John Mitchell in the Materials Science Division of ANL, where he conducted high pressure syntheses of functional mixed metal oxides. He is currently a staff scientist at the Pacific Northwest National Laboratory.

Publication arising from Tamas' work at GT include:

(1) "Zirconium coordination change upon the pressure-induced amorphization of cubic ZrW2O8 and ZrMo2O8" T. Varga, A.P. Wilkinson, Phys. Rev. B 79, 224119 (1-5) (2009). http://dx.doi.org/10.1103/PhysRevB.79.224119

(2) "Heats of Formation for Several Crystalline Polymorphs and Pressure-Induced Amorphous Forms of AMo2O8 (A = Zr, Hf) and ZrW2O8)" T. Varga, C. Lind, A.P. Wilkinson, H. Xu, C.E. Lesher, A. Navrotsky, Chem. Mater. 19, 468-476 (2007). http://dx.doi.org/10.1021/cm0617743

(3) "Heat capacity, lattice dynamics, and thermodynamic stability of the negative thermal expansion material HfMo2O8" C.A. Kennedy, M.A. White, A.P. Wilkinson, T. Varga, Phys. Rev. B 75, 9 (2007). http://dx.doi.org/10.1103/PhysRevB.75.224302

(4)  "Low thermal conductivity of the negative thermal expansion material, HfMo2O8" C.A. Kennedy, M.A. White, A.P. Wilkinson, T. Varga, Appl. Phys. Lett. 90, 151906-3 (2007). http://dx.doi.org/10.1063/1.2721860

(5) "Neutron powder diffraction study of the orthorhombic to monoclinic transition in Sc2W3O12 on compression" T. Varga, A.P. Wilkinson, J.D. Jorgensen, S. Short, Solid State Sci. 8, 289-295 (2006). http://dx.doi.org/10.1016/j.solidstatesciences.2006.02.022

(6) "High pressure synchrotron x-ray powder diffraction study of Sc2Mo3O12 and Al2W3O12 " T. Varga, A.P. Wilkinson, C. Lind, W.A. Bassett, C.-S. Zha, J. Phys.: Condens. Matter 17, 4271-4283 (2005). http://dx.doi.org/10.1088/0953-8984/17/27/004

(7) "In-situ high pressure synchrotron x-ray diffraction study of Sc2W3O12 at up to 10 GPa" T. Varga, A.P. Wilkinson, C. Lind, W.A. Bassett, C.-S. Zha, Phys. Rev. B 71, 214106 (1-8) (2005). http://dx.doi.org/10.1103/PhysRevB.71.214106

(8) "Pressure-induced amorphization of cubic ZrMo2O8 studied in-situ by x-ray absorption spectroscopy and diffraction" T. Varga, A.P. Wilkinson, C. Lind, W.A. Basset, C.-S. Zha, Solid State Commun. 135, 739-744 (2005). http://dx.doi.org/10.1016/j.ssc.2005.05.041

(9) "Pressure-induced amorphization of cubic ZrW2O8 studied in-situ and ex-situ by synchrotron x-ray absorption spectroscopy and diffraction" T. Varga, A.P. Wilkinson, A.C. Jupe, C. Lind, W.A. Bassett, C.-S. Zha, Phys. Rev. B 72, 024117-(1-10) (2005). http://dx.doi.org/10.1103/PhysRevB.72.024117

(10) "Preparation and thermal expansion of (MIII0.5M'V0.5)P2O7 with the ZrP2O7 structure" T. Varga, A.P. Wilkinson, M. Haluska, E.A. Payzant, J. Solid State Chem. 178, 3541-3546 (2005). http://dx.doi.org/10.1016/j.jssc.2005.09.006

(11) "Fluorinert as a pressure-transmitting medium for high-pressure diffraction studies" T. Varga, A.P. Wilkinson, R.J. Angel, Rev. Sci. Inst. 74, 4564-4566 (2003). http://dx.doi.org/10.1063/1.1611993

Cora Lind

Cora was the first student in the group to work on negative thermal expansion materials. Her thesis work included studies of how low temperature so called soft chemistry could be applied to the synthesis of materials under conditions where they were thermodynamicaly unstable, the first preparation and characterization of the negative thermal expansion material cubic ZrMo2O8, and calorimetric studies of negative thermal expansion materials. Her initial paper on ZrMo2O8 has been cited over 100 times. After leaving GT, she took a postdoctoral position with in Frank DiSalvo's lab at Cornell and then a faculty position in the Chemistry Department at the University of Toledo Ohio. She is currently an Associate Professor at the Univeristy of Toledo.

Publications arising from her work at Georgia Tech include:

(1) "Heats of Formation for Several Crystalline Polymorphs and Pressure-Induced Amorphous Forms of AMo2O8 (A = Zr, Hf) and ZrW2O8)" T. Varga, C. Lind, A.P. Wilkinson, H. Xu, C.E. Lesher, A. Navrotsky, Chem. Mater. 19, 468-476 (2007). http://dx.doi.org/10.1021/cm0617743

(2) "Negative thermal expansion in cubic ZrMo2O8: Inelastic neutron scattering and lattice dynamical studies" R. Mittal, S.L. Chaplot, H. Schobes, A.I. Kolesnikov, C.-K. Loong, C. Lind, A.P. Wilkinson, Phys. Rev. B 70, 214303 (2004). http://dx.doi.org/10.1103/PhysRevB.70.214303  

(3) "Heat Capacities, Thrid-Law Entropies and Thermodynamic Functions of the Negative Thermal Expansion Materials, Cubic a-ZrW2O8 and b-ZrMo2O8 From T = 0 K to 400 K" R. Stevens, J. Linford, B.F. Woodfield, J. Boerio-Goates, C. Lind, A.P. Wilkinson, G. Kowach, Journal of Chemical Thermodynamics 35, 919-937 (2003). http://dx.doi.org/10.1016/S0021-9614(03)00050-8

(4) "Preparation, Transport Properties and Structure Analysis by Resonant X-ray Scattering of the Type-I Clathrate Cs8Cd4Sn42" A.P. Wilkinson, C. Lind, R.A. Young, S.D. Shastri, P.L. Lee, G.S. Nolas, Chem. Mater. 14, 1300-1305 (2002). http://dx.doi.org/10.1021/cm0107880

(5) "Kinetics of the cubic to trigonal transformation in ZrMo2O8 and their dependence on precursor chemistry" C. Lind, A.P. Wilkinson, C.J. Rawn, A.E. Payzant, J. Mater. Chem. 12, 990-994 (2002). http://dx.doi.org/10.1039/b108350n

(6) "Seeding and the Non-hydrolytic Sol-Gel Synthesis of ZrW2O8 and ZrMo2O8" C. Lind, A.P. Wilkinson, J. Sol-Gel Sci. Tech. 25, 51-56 (2002). http://dx.doi.org/10.1023/A:1016041010949

(7) "Origin of negative thermal expansion in cubic ZrW2O8 and ZrMo2O8: High pressure inelastic neutron scattering study" R. Mittal, S.L. Chaplot, H. Schober, T.A. Mary, C. Lind, A.P. Wilkinson, Solid State Phys. (India) 44, 656 (2001).

(8) "Preparation of the negative thermal expansion material cubic ZrMo2O8" C. Lind, A.P. Wilkinson, C.J. Rawn, E.A. Payzant, J. Mater. Chem. 11, 3354-3359 (2001). http://dx.doi.org/10.1039/b104283c

(9) "New high pressure form of the negative thermal expansion materials zirconium molybdate and hafnium molybdate" C. Lind, D.G. VanDerveer, A.P. Wilkinson, J. Chen, M.T. Vaughan, D.J. Weidner, Chem. Mater. 13, 487-490 (2001). http://dx.doi.org/10.1021/cm000788k

(10) "X-ray Diffraction and X-ray Absorption Spectroscopy Studies of Sol-Gel Processed Zirconium Titanates" J. Xu, S. Pattanaik, C. Lind, A.P. Wilkinson, Chem. Mater. 12, 3347-3355 (2000). http://dx.doi.org/10.1021/cm000298s

(11) "A New Polymorph of ZrW2O8 Prepared using Nonhydrolytic Sol-Gel Chemistry" A.P. Wilkinson, C. Lind, S. Pattanaik, Chem. Mater. 11, 101-108 (1999). http://dx.doi.org/10.1021/cm9805065

(12) "Synthesis and Properties of the Negative Thermal Expansion Material Cubic Zirconium Molybdate" C. Lind, A.P. Wilkinson, Z. Hu, S. Short, J.D. Jorgensen, Chem. Mater. 10, 2335-2337 (1998). http://dx.doi.org/10.1021/cm980438m
 

Jie Xu

Jie's thesis work focused on the sol-gel processing of dielectric and ferroelectric oxides. After graduation she briefly worked at the CAMD synchrotron source in Louisiana prior to taking a position at Georgia Tech Research Institute.

Her publications from work done while in the Wilkinson group include:

 

M.S. Graduates

Ryan E. Josefsberg
Chad J. Ruschman

After graduation, Chad took a position teaching chemistry at Gordon College Georgia, GA

Mehmet Kutukcu

Mehmet returned to his native country, Turkey, after graduation to pursue a business oportunity.

John Kruger

John is a chemistry instructor at North Georgia College and State University, Dahlonega, GA.

Jason Jasper
Mary-Jo Gray
Sloane Stalder

 

Undergraduate researchers

Justin C. Hancock
Chris M. Monaco
 

Post-Docs and Research Scientists

Andrew C. Jupe
Carine Van Petghem
Sidhartha Patanaik