Research Area = Materials Physics/Condensed matter physics Methods = Experiment coupled with theory/computation Research Goals Glassy, Nanostructured, Crystalline Solids Research Goals • • • New Materials Discovery • • • Physics of materials • • • Superior Properties Mechanical, Thermoelectronic, Magnetic properties
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Research Area= Materials Physics/Condensed matter physics
Methods= Experiment coupled with theory/computation
Research Goals
Glassy, Nanostructured, Crystalline Solids
Research Goals•••• New Materials Discovery
•••• Physics of materials
•••• Superior Properties
Mechanical, Thermoelectronic, Magnetic properties
X-ray diffraction Atomic force microscopyLow energy electron microscope
Example of unusual electronic structures –interplay of orbitals and crystal structure
Tobola et al, 1998
Scientific issues of interest Bandgap material -
interesting thermoelectronic properties
Magnetic state with gapless spin-up band and gapped spin-down band (spin-
polarized state)
T (K)
ordinarymetal
Thermopower
Energy (eV)
Harvesting Energy using Thermoelectrics: Cooling and Power GenerationHarvesting Energy using Thermoelectrics: Cooling and Power GenerationHarvesting Energy using Thermoelectrics: Cooling and Power GenerationHarvesting Energy using Thermoelectrics: Cooling and Power Generation
Thermoelectric materials are used in electronic refrigeration and power generation. The materials are environmentally “green” . The devices are compact and involve no moving parts.
Cooling of computer chips (CPU), low noise amplifiers, IR detectors….Power generation using waste heat - Space (NASA) and Naval applications.
Radioisotope TE Generator
(RTG) 250W
Fission reactor Power (100 kW)
High Temperature: 1000 C hot, 500 C coldTE or Brayton Engine for energy conversion
• Atomic- and nano-scale structural designcan lead to low κ
Why study Nanostructured and Glassy Solids ?
1. Can form a Can form a Can form a Can form a broader rangebroader rangebroader rangebroader range of materialsof materialsof materialsof materials(non-equilibrium methods involve short length and time scales)
resulting in resulting in resulting in resulting in newnewnewnew magnetic, structural, thermoelectronic materialsmagnetic, structural, thermoelectronic materialsmagnetic, structural, thermoelectronic materialsmagnetic, structural, thermoelectronic materials