超导国家重点实验室学术报告

 

报告题目：Thermoelectric Materials and Fast Ionic Conductors with Structural Instabilities

 

报告人：Sergey Danilkin

Australian Centre for Neutron Scattering, ANSTO

 

报告摘要：

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.

 

报告时间： 2018年3月20日（星期二）10:00

报告地点：M236会议室

联系人：  罗会仟 副研究员 （82649816）

 

 

报告人简介：

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.

 

Education:

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