Insight into the origin of process-related properties like small-scale inhomogeneities is key for material optimization.Here,we analyze DFT calculations of randomly doped HfO_(2) structures with Si,La,and VO and relat...Insight into the origin of process-related properties like small-scale inhomogeneities is key for material optimization.Here,we analyze DFT calculations of randomly doped HfO_(2) structures with Si,La,and VO and relate them to the kind of production process.Total energies of the relevant ferroelectric Pbc2_(1) phase are compared with the competing crystallographic phases under the influence of the arising local inhomogeneities in a coarse-grained approach.The interaction among dopants adds to the statistical effect from the random positioning of the dopants.In anneals after atomic layer or chemical solution deposition processes,which are short compared to ceramic process tempering,the large energy variations remain because the dopants do not diffuse.Since the energy difference is the criterion for the phase stability,the large variation suggests the possibility of nanoregions and diffuse phase transitions because these local doping effects may move the system over the paraelectric-ferroelectric phase boundary.展开更多
基金The Deutsche Forschungsgemeinschaft(German Research Foundation)has funded this research in the frame of the project Inferox II(Project MI 1247/11-2)This work was supported by the Deutsche Forschungsgemeinschaft(German Research Foundation(DFG)-Project 393121356)and the Munich University of Applied Sciences(MUAS)through the Open Access Publishing program.
文摘Insight into the origin of process-related properties like small-scale inhomogeneities is key for material optimization.Here,we analyze DFT calculations of randomly doped HfO_(2) structures with Si,La,and VO and relate them to the kind of production process.Total energies of the relevant ferroelectric Pbc2_(1) phase are compared with the competing crystallographic phases under the influence of the arising local inhomogeneities in a coarse-grained approach.The interaction among dopants adds to the statistical effect from the random positioning of the dopants.In anneals after atomic layer or chemical solution deposition processes,which are short compared to ceramic process tempering,the large energy variations remain because the dopants do not diffuse.Since the energy difference is the criterion for the phase stability,the large variation suggests the possibility of nanoregions and diffuse phase transitions because these local doping effects may move the system over the paraelectric-ferroelectric phase boundary.
