Speaker
Mr
Rongjin HUANG
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Description
Negative thermal expansion (NTE) materials, which contract rather than expand when heated, can be blended with materials showing positive thermal expansion to form composite for obtaining precisely tailored thermal expansion coefficient. Low-temperature NTE materials have wide potential applications in cryogenic engineering. The NaZn13-type La(Fe,Si)13-based compounds are recently developed as promising NTE materials, the NTE properties of which, in this study, were modified by doping minor Al element in order to make it more suitable for practical applications in cryogenic engineering. The results indicate that the NTE operation-temperature window shifts toward a lower temperature region due to the decrease of the Curie temperature (Tc) with increasing the amount of Al element in LaFe11.5Si1.5-xAlx compounds. Furthermore, the NTE operation-temperature window of LaFe11.5Si1.5-xAlx was broadened with increasing Al content. Such La(Fe,Al,Si)13 compounds with noteworthy NTE properties in low temperature region promote their potential applications for cryogenic equipments and precise instruments.
Author
Mr
Rongjin HUANG
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Co-authors
Mr
Laifeng Li
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Mr
Shaopeng Li
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Mr
Wei WANG
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Ms
Wen LI
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
Mr
Yuqiang ZHAO
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P.R. China)
