Hydrogen-Induced Phase Transition and Emergent Properties in SrFeO_(x)  

作　　者：Ming-Tong Zhu Lu Wang Lei Gao Jin Liu Xiang-Yu Lyu Yu-Qian Wang Chao Lu Meng-Cheng Li Peng-Yu Liu Jia-Yi Song Hua-Yu Tao Ben-Bo Zhao Ai-Ling Ji Ze-Xian Cao Nian-Peng Lu 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]School of Chemical Engineering and Technology,North University of China,Taiyuan 030051,China [4]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 101408,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics Letters》2025年第3期118-130,共13页中国物理快报(英文版)

基　　金：supported by the National Key R&D Program of China(Grant Nos.2022YFA1403000 and 2024YFA1408302);the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-047);the Strategic Priority Research Program of the Chinese Academy of Sciences of China(Grant No.XDB33000000)。

摘　　要：In recent years,ionic modulation,particularly hydrogen intercalation,has gained attention as a powerful method for tuning the properties of materials.Although the SrFeO_(x)system is similar to SrCoO_(x),which can be protonated to the HSrCoO_(2.5)phase,it remains a challenge for the hydrogenation of SrFeO_(2.5).In this study,starting from the perovskite SrFeO_(3−δ),we achieved hydrogen intercalation and obtained stable hydrogenated brownmillerite-phase HSrFeO_(2.5)via Pt-catalyzed H-spillover at room temperature.The results indicate that the hydrogenation process is accompanied by the simultaneous oxygen ionic release,that is,perovskite SrFeO_(3−δ)is the prerequisite for the hydrogen-induced phase transition.Subsequently,upon hydrogenation,the entire phase transition cycle among the perovskite SrFeO_(3−δ),brownmillerite SrFeO_(2.5),and the hydrogenated HSrFeO_(2.5)phase,is completed.Furthermore,SrFeO_(3−δ)exhibits a remarkable 9.4%lattice expansion,and its electronic state undergoes a multi-step evolution,transforming from a pristine helical antiferromagnetic insulator to a bad metal,eventually returning to an antiferromagnetic insulator.Based on the obtained results,we fabricated microscale patterns with varied surface morphologies and electrical conductivities that can be used in fabricating electronic devices.This study presents a novel approach for modulating the properties of correlated and functional materials.

关 键 词：PEROVSKITE HYDROGENATION TRANSITION 

分 类 号：TG6[金属学及工艺—金属切削加工及机床]