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DTSTART:20220327T030000
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BEGIN:VEVENT
DTSTAMP:20260424T143451Z
UID:1655105400@ist.ac.at
DTSTART:20220613T093000
DTEND:20220613T103000
DESCRIPTION:Speaker: Dr. Matthias T. Agne\nhosted by Maria Ibáñez\nAbstra
 ct: Phonon channel engineering through crystal chemistry and defectsIn th
 e classic theory of thermal transport by atomic vibrations (phonons) in cr
 ystalline materials\, heat moves in a manner analogous to a gas\, describe
 d by a velocity and by scattering events. This is known as the phonon gas 
 model. Thermal transport in amorphous materials is fundamentally different
 \, where heat moves in a manner analogous to an atomic-scale random walk. 
 These phonons can be called diffusons. Only recently have these two perspe
 ctives been unified within one theoretical framework\, which subsequently 
 shows that phonons in complex crystalline materials can exhibit both gas-l
 ike and diffuson-like character. Effective tuning of thermal conductivity 
 thus requires an understanding of both transport “channels.” This talk
  will discuss materials design strategies in the context of two-channel tr
 ansport. It will be shown that many ultralow thermal conductivity material
 s likely have both types of phonon transport\, whose relative contribution
 s depend strongly on temperature. Furthermore\, factors like chemical comp
 osition and material defects may be used to prefer or suppress one channel
  or the other.
LOCATION:Big Seminar Room B - Sunstone Building\, ISTA
ORGANIZER:
SUMMARY:Dr. Matthias T. Agne: Phonon channel engineering through crystal ch
 emistry and defects
URL:https://talks-calendar.ista.ac.at/events/3806
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