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Deterministic Dual Control of phase competition in Strained BiFeO_(3):A Multiparametric Structural Lithography Approach

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Nanomanufacturing and Metrology 2022年第1期5卷 60-66页

作者： Nathan Black David Edwards Niall Browne Joseph G.M.Guy Niyorjyoti Sharma Kristina M・Holsgrove Aaron B.Naden Raymond G.P.McQuaid Brian J.Rodriguez Amit Kumar School of Maths and Physics Queen's University BelfastBelfast BT7 INNUK School of Chemistry University of St.AndrewsSt Andrews KY169STUK School of Physics University College DublinBelfieldDublin 4Ireland

The realization of a mixed-phase microstructure in strained BiFeO_(3)(BFO)thin films has led to numerous novel effects derived from the coexistence of the tetragonal-like monoclinic phase(T phase)and rhombohedral-like monoclinic phase(R phase).Strong strain and polarization diiferences between the phases should result in a high level of transformation plasticity,which enables the continuous alteration of the relative proportion of R and T states in response to external forces.Although the potential for utilizing such plasticity to control mixed-phase populations under external stimuli is evident,direct experi・mental evidence backed by equilibrium predictions has not yet been fully demonstrated.Here we demonstrate deterministic control of mixed-phase populations in an epitaxially strained BFO thin film through the application of localized stresses and electric fields in a reversible manne匚The results illustrate and rationalize deterministic control of mixed phases in strained BFO films,which could be crucial in tuning their functional properties.The findings also highlight a new multiparametric technique in the scanning probe lithography toolbox based on tip-assisted electric and strain field manipulation of functional properties that might find application beyond the ferroelectric domain and structural phase lithography.

关键词： phase competition Ferroelectric Stress Lithography

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Interfacial phase competition induced Kondo-like effect inmanganite-insulator composites

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Frontiers of physics 2016年第6期11卷 129-133页

作者： Ling-Fang Lin Ling-Zhi Wu Shuai Dong Department of Physics Southeast University Nanjing 211189 China School of Geography and Biological Information Nanjing University of Posts and Telecommunications Nanjing 210046 China

A Kondo-like effect, namely, the upturn of resistivity at low temperatures, is observed in perovskite manganite when nonmagnetic insulators are doped as secondary phase. In this paper, the low-temperature resistivity upturn effect has been argued to originate from interfacial magnetic phase reconstruction. Heisenberg spin lattices have been simulated using the Monte Carlo method to reveal phase competition around secondary phase boundary, namely, manganite-insulator boundary that behaves with a weak antiferromagnetic tendency. Moreover, the resistor network model based on double-exchange conductive mechanism reproduces the low-temperature resistivity upturn effect. Our work provides a reasonable physical mechanism to understand the novel transport behaviors in microstructures of correlated electron systems.

关键词： manganite Kondo-like effect manganite-insulator composites phase competition 75.47.Lx 75.47.Gk 73.63.-b

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Cation Ordering and phase competition in Ba8M2+M'65+O24 Hexagonal Perovskite Tantalate and Niobate Dielectrics

Cation Ordering and Phase Competition in Ba8M2+M'65+O24 Hexa...

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中国化学会第十届全国无机化学学术会议

作者： Xiaojun Kuang College of Chemistry and Bioengineering Guilin University of Technology

BaMM’O-type B-cation deficient hexagonal perovskite tantalates and niobates attract attention as microwave dielectric resonators because of their high quality factors and interesting structural chemistry. 8-layer hexagonal perovskite Niobates display twin-shift option and rarely nanometer-scale long-range cation order has been observed in the shifted BaCoNbO, BaZnNbO and BaZnNbO so far. While their Ta-counterparts form exclusively twinned structures. Here we details the correlation of the cation order and phase competition with the B-cationic size and charge differences as well as the bonding preferences associated with the bonding covalence and the second-order Jahn-Teller(SOJT) effect of d Nb and Ta in the BaMM’O hexagonal perovskites. Also we present the Ta-substitution effect on lowering the temperature coefficient of resonant frequency t of 8-lyaer shifted hexagonal perovskite dielectrics toward near-zero t values.

关键词： Microwave dielectric ceramic Hexagonal perovskite cation ordering phase competition

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Simulation of the magnetoresistance of Heisenberg spin lattices using the resistor network model

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Chinese Physics B 2013年第11期22卷 552-556页

作者：林玲芳黄欣董帅 Department of Physics Southeast University

The magnetism and conductance of two-dimensional Heisenberg spin lattices are investigated by using Monte Carlo simulations to qualitatively understand a fascinating magnetoresistance effect observed in magnetic materials and their artificial multilayers. Various magnetic profiles, including a pure ferromagnetic, a pure antiferromagnetic, two phase com-petitive cases, and an artificial sandwich junction, are simulated, and their conductances are calculated based on an extended resistor-network model. Magnetoresistance is observed in some lattices, which is prominent when the system is near phase boundaries. Compared with real manganites, the absence of colossal magnetoresistance in our simulation implies the es- sential role of charge ordered phase which is not included in our pure spin model. However, our model provides an intuitive understanding of the spin-dependent conductance in large scale.

关键词： magnetoresistance resistor-network model phase competition

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Direct evidence for competition between metastable ω and equilibrium α phases in aged β-type Ti alloys

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Rare Metals 2014年第4期33卷 390-393页

作者： Shun Guo Qing-Kun Meng Hong-Ping Li Xin-Qing Zhao Institute for Advanced Materials School of Materials Science and EngineeringJiangsu University School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics

Precipitation response of a recently developed β-type Ti-25Nb-2Mo-4Sn alloy （wt%） during aging was investigated in detail. Experimental results indicate that the metastable co or equilibrium α phase can form alternatively even under the same aging condition, depending on the condition prior to the aging, i.e., solution treatment or severe cold rolling. This provides, for the first time, the direct evidence for the competition between ω and α in aged β-type Ti alloys. This peculiar aging response is found to be closely related to high-density dislocations and grain boundaries which suppress the formation of ω but favor the precipitation of fine α phase.

关键词： β-Type Ti alloy phase competition o~ phase at phase

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