Code:
\documentclass[fontsize=12pt]{scrartcl}
\usepackage{luatextra,luaotfload}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[babel,german=guillemets]{csquotes}
\DeclareFontFamily{T1}{libertine}{}
\DeclareFontShape{T1}{libertine}{m}{n}{<-> "LinLibertine_Re:+liga"}{}
\DeclareFontShape{T1}{libertine}{m}{sc}{<-> "LinLibertineC_Re:+liga:+smcp"}{}
\DeclareFontShape{T1}{libertine}{m}{it}{<-> "LinLibertine_It:+liga"}{}
\DeclareFontShape{T1}{libertine}{bx}{n}{<-> "LinLibertine_Bd:+liga"}{}
\DeclareFontShape{T1}{libertine}{bx}{it}{<-> "LinLibertine_BI:+liga"}{}
\newcommand\libertine{\fontfamily{libertine}\selectfont}
\DeclareFontFamily{T1}{biolinum}{}
\DeclareFontShape{T1}{biolinum}{m}{n}{<-> "Biolinum_Re:+liga"}{}
\DeclareFontShape{T1}{biolinum}{bx}{n}{<-> "Biolinum_Bd:+liga"}{}
\newcommand\biolinum{\fontfamily{biolinum}\selectfont}
%\renewcommand{\rmdefault}{\fontfamily{libertine}\selectfont}
%\renewcommand{\sfdefault}{\fontfamily{biolinum}\selectfont}
\begin{document}
Qu cm-fonts tz\\
\libertine
Qu libertine tz\\
\biolinum \\
Qu biolinum tz\\
\libertine
\enquote{in klammern?}
\end{document}
danke fuer eure hilfe!
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