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Three Distinct Deformation Behaviors of Cementite Lamellae in a Cold-Drawn Pearlitic Wire
Tuo Xin,Guiju Liu,Wenshuang Liang,Rongsheng Cai,Honglei Feng,Chen Li,Jian Li,Yiqian Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
High-resolution transmission electron microscopy is used to investigate the deformation behaviors of cementite lamellaein the heavily cold-drawn piano wires. Three distinct morphologies of cementite are observed, namely, complete lamella,partly-broken lamella and nearly-disappeared lamella. For the complete cementite lamella, it remains a single-crystallinestructure. For the partly-broken cementite lamella, polycrystalline structure and neck-down region appear to release theresidual strain. The lattice expansion of ferrite takes place in two perpendicular directions indicating that the carbon atomsdissolve from cementite into ferrite lattices. An orientation relationship is found between ferrite and cementite phases in thecold-drawn pearlitic wire.
One-Pot Synthesis of α-Fe2O3 Nanospindles as High-Performance Lithium-Ion Battery Anodes
Yanhua Ding,Bing Liu,Rongsheng Cai,Tuo Xin,Chen Li,Linhua Xia,Yiqian Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
Hematite nanospindles with a uniform size of ~270 nm in length and ~90 nm in width are prepared using a facile one-step hydrothermal method. Polyvinylpyrrolidone (PVP) serves as a structure-directing agent to control the primary morphology and aggregations. When evaluated as anode materials for lithium-ion batteries (LIBs), the electrode of sodium alginate (SA) binder exhibits a much better electrochemical performance than that with the polyvinylidene fluoride (PVDF) binder. Remarkably, the electrode using SA binder can deliver a high reversible specific capacity of 979mAh · g -1 after 50 cycles and prominent rate capability. The microstructural evolution of the nanospindles after the electrochemical cycling is investigated by scanning transmission electron microscopy (STEM). Our results may provide important mechanistic insights for the design of nanostructured anode materials for LIBs.