G. Jeffrey Snyder

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Localized areas of high heat flux on microprocessors produce hot spots that limit their reliability and performance. With increasingly dense circuits and the integration of high power processors with low power memory, non-uniform thermal profiles will become more dramatic and difficult to manage. Chip scale thermal solutions designed to keep hot spots below(More)
By converting waste heat into electricity and improving the efficiency of refrigeration systems, thermoelectric devices could play a significant role in solving today's energy problems. Increasing the thermoelectric efficiency (as measured by the thermoelectric material's figure-of-merit, zT) is critical to the development of this technology. Complex Zintl(More)
Advances in the microelectronics industry have made it possible to fabricate a multitude of microdevices, such as microprocessors, microsensors, microcontrollers, and microinstruments. These electronic microdevices have significantly reduced power requirements but at the same time require more attention in terms of integrated thermal management and power(More)
Polycrystalline samples of some compounds with the PbBi4Te7 crystal structure have been synthesized and characterized by x-ray and microprobe analysis. Seebeck coefficient, electrical resistivity, and thermal conductivity measurements were also performed in the 300-650K temperature range. Their thermoelectric properties vary widely from semiconducting to(More)
Electrical power requirements for the next generation of deep space missions cover a wide range from the kilowatt to the milliwatt. Several of these missions call for the development of compact, low weight, long life, rugged power sources capable of delivering a few milliwatts up to a couple of watts while operating in harsh environments. Advanced solid(More)
A milliwatt power source (MPS) has been developed to satisfy the requirements of several potential solar system exploration missions. The MPS is a small power source consisting of three major components: a space qualified heat source (RHU), a thermopile (thermoelectric converter or TEC) and a container to direct the RHU heat to the TEC. suitable for the MPS(More)
To minimize the lattice thermal conductivity in thermoelectrics, strategies typically focus on the scattering of low-frequency phonons by interfaces and high-frequency phonons by point defects. In addition, scattering of mid-frequency phonons by dense dislocations, localized at the grain boundaries, has been shown to reduce the lattice thermal conductivity(More)
CoSb3-based filled skutterudite has emerged as one of the most viable candidates for thermoelectric applications in automotive industry. However, the scale-up commercialization of such materials is still a challenge due to the scarcity and cost of constituent elements. Here we study Ce, the most earth abundant and low-cost rare earth element as a(More)
Nature no longer runs the Earth. We do. It is our choice what happens from here (Lynas 2011, 8). Humans neither can nor ought to denature their planet. .. On larger planetary scales it is better to build our cultures in intelligent harmony with the way the world is already built, rather than take control and rebuild this promising planet by ourselves. .. We(More)