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Sökning: WFRF:(Huang Binxiang)

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1.
  • Huang, Binxiang, et al. (författare)
  • Electrostatic Boundary Conditions and (Electro)chemical Interface Stability
  • 2023
  • Ingår i: Advanced Materials Interfaces. - 2196-7350. ; 10:21
  • Tidskriftsartikel (refereegranskat)abstract
    • Interface stability is a key factor for stable operation of electronic and electrochemical devices. This contribution introduces an approach for the operando analysis of interfaces using photoelectron spectroscopy employing a solid oxide electrochemical cell. The combined chemical and electronic information provided by the experiment reveals that not only chemical but also electrostatic boundary conditions are essential for interface stability. The approach is demonstrated using (anti-)ferroelectric (Pb,La)(Zr,Sn,Ti)O3 dielectrics.
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2.
  • Klein, Andreas, et al. (författare)
  • The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics
  • 2023
  • Ingår i: Journal of Electroceramics. - 1573-8663 .- 1385-3449.
  • Tidskriftsartikel (refereegranskat)abstract
    • Chemical substitution, which can be iso- or heterovalent, is the primary strategy to tailor material properties. There are various ways how a material can react to substitution. Isovalent substitution changes the density of states while heterovalent substitution, i.e. doping, can induce electronic compensation, ionic compensation, valence changes of cations or anions, or result in the segregation or neutralization of the dopant. While all these can, in principle, occur simultaneously, it is often desirable to select a certain mechanism in order to determine material properties. Being able to predict and control the individual compensation mechanism should therefore be a key target of materials science. This contribution outlines the perspective that this could be achieved by taking the Fermi energy as a common descriptor for the different compensation mechanisms. This generalization becomes possible since the formation enthalpies of the defects involved in the various compensation mechanisms do all depend on the Fermi energy. In order to control material properties, it is then necessary to adjust the formation enthalpies and charge transition levels of the involved defects. Understanding how these depend on material composition will open up a new path for the design of materials by Fermi level engineering.
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