Bryan Chakoumakos

Bryan Chakoumakos

Position: Structure of Matter Group Lead

Instrument: Four-Circle Diffractometer

Group: Structure of Matter

Division: Quantum Condensed Matter Division

Facility: Spallation Neutron Source

Contact: chakoumakobc@ornl.gov or (865) 621-0227

Education

PhD in Geological Sciences (mineralogy & crystallography) at Virginia Tech

Research

Dr. Chakoumakos studies structure property relationships in technological and natural materials and the synthesis, crystal growth, and characterization of novel materials. He employs crystallography, mineralogy, and single-crystal and powder diffraction methods.

Selected Publications

B.C. Chakoumakos, R. Custelcean, J. O. Ramey, J. A. Kolopus, Rongying Jin, J.S. Neal, D.J. Wisniewski, and L.A. Boatner, Cerium chloride – methanol adduct crystals, CeCl3(CH3OH)4: preparation, crystallography, and scintillation properties, Crystal Growth & Design 8 2070-2072 (2008)

B.C. Chakoumakos and B.C. Sales, Crystal structure response in filled skutterudites, Journal of Alloys and Compounds 407 87-93 (2006)

B.C. Chakoumakos, C.J. Rawn, A.J. Rondinone, L.A. Stern, S. Circone, S.H. Kirby, Y. Ishii, C.Y. Jones, B.H. Toby, and D.C. Dender, Temperature dependence of polyhedral cage volumes in clathrate hydrates, Canadian Journal of Physics 81 183-189 (2003)

B.C. Chakoumakos, B.C. Sales, D. Mandrus, and G.S. Nolas, Structural disorder and thermal conductivity of the semiconducting clathrate Sr8Ga16Ge30, Journal of Alloys and Compounds 296 80-86 (2000)

B.C. Sales, B.C. Chakoumakos, D. Mandrus, and J.W. Sharp, Atomic displacement parameters and the lattice thermal conductivity of clathrate-like thermoelectric compounds, Journal of Solid State Chemistry 146 528-532 (1999)

B.J. Kennedy, C.J. Howard, and B.C. Chakoumakos, Phase transitions in perovskite at elevated temperatures - a powder neutron diffraction study, Journal of Physics, Condensed Matter 11 1479-1488 (1999)

V. Keppens, D. Mandrus, B.C. Sales, B.C. Chakoumakos, P. Dai, R. Coldea, M.B. Maple, D.A. Gajewski, E.J. Freeman, and S. Bennington, Localized vibrational modes in metallic solids, Nature 395 876-878 (1998)

B.C. Sales, D. Mandrus, B.C. Chakoumakos, V. Keppens and J. R. Thompson, Filled skutterudite antimonides: Electron crystal and phonon glasses, Physical Review B 56 15081-15089 (1997)

D.P. Norton, B.C. Chakoumakos, J.D. Budai, D.H. Lowndes, B.C. Sales, J.R. Thompson, and D.K. Christen, Superconductivity in SrCuO2/BaCuO2 superlattices: Formation of artificially-layered super-conducting materials, Science 265 2074-2076 (1994)

B.C. Chakoumakos, M.A. Abraham, and L.A. Boatner, Rietveld structure refinements of zircon-type MVO4 (M = Sc, Y, Ce, Pr, Tb, Ho, Er, Tm, Yb, Lu) using neutron diffraction data, Journal of Solid State Chemistry 109 197-202 (1993)

B.C. Chakoumakos and G.R. Lumpkin, Pressure-temperature constraints on the crystallization of the Harding pegmatite, Taos County, New Mexico, Canadian Mineralogist 28 287-298 (1990)

B.C. Chakoumakos, T. Murakami, G.R. Lumpkin, and R.C. Ewing, Alpha-decay induced fracturing in zircon: the transition from the crystalline to the metamict state, Science 236 1556-1559 (1987)

B.C. Chakoumakos, Systematics of the pyrochlore structure type, ideal A2B2X6Y, Journal of Solid State Chemistry 53 120-129 (1984)