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Thermoelectric Materials and Fast Ionic Conductors with Structural Instabilities

Date: 2018-03-20
Time: 10:00
Venue: M236会议室
Speaker: Sergey Danilkin

Australian Centre for Neutron Scattering, ANSTO

In the talk I will give a short overview of neutron scattering results on the thermoelectric materials, especially for their lattice dynamics.
Copper selenide attracted interest due to high ionic conductivity and efficient thermoelectric properties. I will present results of neutron scattering investigation of the crystal structure, diffuse scattering, quasi-elastic neutron scattering and BWS calculations in the Cu-Se superionic compounds.
Tin selenide is another material of noticeable current interest due to remarkably high thermoelectric performance, in particular related to an unexpectedly low thermal conductivity. I will present experimental results on temperature dependence of phonon dispersion, phonon density of states together with DFT and AIMD simulation of lattice dynamic of the system.
Brownmillerites Sr2Fe2O5 and Ca2Fe2O5 have high oxygen ion conductivity at moderate temperatures and relatively low ZT values. We found that some optic modes have unusually low frequency at Brillouin zone centre, overdamped below ~ 4 meV and merge into acoustic intensity. The Ca2Fe2O5 is a canted G-type antiferromagnet that gives rise to magnon peaks in inelastic scattering. With this crystal we perform test measurements at spectrometer TAIPAN with polarization analysis that makes possible the clear distinguishing between phonon and magnon signals.

Dr. Sergey A. Danilkin, Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization (ANSTO)
Dr Sergey Danilkin joined ANSTO in August 2004 to lead the efforts on installation and development of the TAIPAN thermal-beam 3-Axis Spectrometer at the OPAL reactor. He completed his BSc in materials science and solid-state physics at the Moscow Institute of Physical Engineering in 1974. He then went to work at the Institute for Physics and Power Engineering (Obninsk) in Laboratory of Neutron Spectroscopy performing experiments with time-of-flight spectrometer DIN-2 at the pulsed reactor in Dubna, Russia.

Sergey received his PhD in experimental physics from the Joint Institute for Nuclear Research (Dubna) in 1986, studying the lattice dynamics of light interstitial atoms in transition metals. Immediately prior to joining ANSTO, he was instrument scientist for a 3-Axis Spectrometer at the Hahn-Meitner Institute, Berlin, Germany. His current research interests include inelastic neutron scattering study of superionic conductors and thermoelectric materials.

1986 PhD in Experimental Physics graduated from Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia.
1974 Diploma (Master) in Solid State Physics from Moscow Institute (Technical University) of Physics and Engineering.

Academic Rank: Senior scientist, 1992 (Russia)

Work History:
2004 – Present Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights NSW, Australia.
2009 - present Instrument scientist
2004 - 2009 Project leader “Triple-axis spectrometer TAIPAN”
2000 – 2003 BeNSC, Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Germany.
Instrument scientist at triple-axis spectrometer
1974 – 2000 Laboratory of neutron spectroscopy, Institute of Physics and Power Engineering, 249020 Obninsk, Russia
1998 – 2000 Head scientist
1990 – 1998 Senior scientist
1985 - 1990 Researcher
1978 - 1985 Engineer
1974 - 1978 PhD thesis student

联系人: 罗会仟 副研究员 (82649816)