X-Git-Url: https://hackdaworld.org/gitweb/?p=lectures%2Flatex.git;a=blobdiff_plain;f=posic%2Fthesis%2Fdefects.tex;h=a02e20979d7e42ad636f59c118abe3c7e85b4ee0;hp=a69cfbb1efce4a7c3bb3468231c7b352b45efda4;hb=8e227ee00a49bc25714678ea38939b2af5817bd8;hpb=5c34f34459cff1df7493614a014d1e594f47a9b6 diff --git a/posic/thesis/defects.tex b/posic/thesis/defects.tex index a69cfbb..a02e209 100644 --- a/posic/thesis/defects.tex +++ b/posic/thesis/defects.tex @@ -163,10 +163,10 @@ Hence, the chemical potential of Si and C is determined by the cohesive energy o \hline & T & H & \hkl<1 0 0> DB & \hkl<1 1 0> DB & S & BC \\ \hline -\multicolumn{6}{c}{Present study} \\ +Present study & & & & & & \\ {\textsc posic} & 6.09 & 9.05$^*$ & 3.88 & 5.18 & 0.75 & 5.59$^*$ \\ {\textsc vasp} & Unstable & Unstable & 3.72 & 4.16 & 1.95 & 4.66 \\ -\multicolumn{6}{c}{Other studies} \\ +Other studies & & & & & & \\ Tersoff \cite{tersoff90} & 3.8 & 6.7 & 4.6 & 5.9 & 1.6 & 5.3 \\ {\em Ab initio} \cite{dal_pino93,capaz94} & - & - & x & - & 1.89 & x+2.1 \\ \hline @@ -431,8 +431,6 @@ The blue torus, which reinforces the assumption of the $p$ orbital, illustrates In addition, the energy level diagram shows a net amount of two spin up electrons. % todo smaller images, therefore add mo image -% todo migration of \si{}! - \section{Migration of the carbon interstitial} \label{subsection:100mig} @@ -1457,6 +1455,15 @@ $t=\unit[2900]{fs}$ Si atoms 1 and 2, which form the initial DB, occupy Si lattice sites in the final configuration while Si atom 3 is transferred from a regular lattice site into the interstitial lattice. These results support the above assumptions of an increased entropic contribution to structural formation involving C$_{\text{s}}$ to a greater extent. + +% link to migration of \si{}! +The possibility for separated configurations of \cs{} and \si{} becomes even more likely if one of the constituents exhibits a low barrier of migration. +In this case, the \si{} is assumed to constitute the mobile defect compared to the stable \cs{} atom. +Acoording to Fig.~\ref{fig:defects:si_mig1}, an activation energy of \unit[0.67]{eV} is necessary for the transition of the \si{} \hkl[0 1 -1] to \hkl[1 1 0] DB located at the neighbored Si lattice site in \hkl[1 1 -1] direction. +Indeed, the transition ... equal to as if cs is near .. +Further ... + + % kept for nostalgical reason! %\section{Migration in systems of combined defects}