Invited Speaker
Prof. Jikun Chen
University of Science and Technology Beijing
E-mail: jikunchen@ustb.edu.cn
Title:
Molten Salt Synthesis of Metastable Perovskite Nickelates Electronic Phase Transition Semiconductors within MPa-high Oxygen Pressures
Profile:
Prof. Jikun Chen works in the School of Materials Science and Engineering, University of Science and Technology, focusing on electronic phase transition semiconductors and their correlated electronic applications. He obtained his PhD in ETH Zurich, Switzerland; and worked as postdoc or visiting scholars in Harvard University, the University of Tokyo and Kyoto University. He published two books and approximately two hundred papers in scientific journals, such as Nature Communications, Advanced Materials, Matter and Newton, and obtained more then twenty patterns.
Abstract:
The multiple magneto-/electrical quantum transitions discovered with d-band correlated metastable perovskite nickelate (RENiO3) is promising for correlated electronic applications in the post-Moore Era. Nevertheless, their material synthesis requires a GPa-high pressure, as provided by cubic press, to stabilized their highly distorted perovskite structure (in particular for the ones exhibiting the heavy rare-earth composition), but this largely limits their synthetic amount as required by discrete device applications. Herein, we synthesized the powder of RENiO3 in grams/batch with ∼1000 times lower pressure and ∼300 ℃ lower temperature in comparison to the previous tens of milligram/batch results, assisted by their eutectic precipitation and heterogeneous growth within alkali-metal halide molten salt at MPa oxygen pressures. This provides solid base for further exploring the new functionalities of RENiO3 under extreme conditions, such as high pressures. The in situ characterizations of their transportation properties under high pressures within a diamond anvil cell reveal a distinguishing pressure predominated bad metal transport within the nonequilibrium state of RENiO3 showing high-pressure sensitivity up to 10 GPa, and the temperature dependences in electrical transportations are effectively frozen, shedding a light on their potential applications in pressure sensors at GPa-ranges.
