Fig. 5

Positive correlation between the conductivity and crystallinity of \({\mathrm{BLSO}}_{{\mathrm{MgAl}}_{2}{\mathrm{O}}_{4}}^{\mathrm{MgO}}\). There is a decrease of (a) carrier density and (b) mobility with an increase of La concentration in both \({\mathrm{BLSO}}_{{\mathrm{MgAl}}_{2}{\mathrm{O}}_{4}}^{\mathrm{MgO}}\) and \({\mathrm{BLSO}}_{{\mathrm{SrTiO}}_{3}},\) most clearly observed above 10% La doping. c At the same time, there is an increase in FWHM of the (002)BLSO XRD peak with La concentration for \({\mathrm{BLSO}}_{{\mathrm{MgAl}}_{2}{\mathrm{O}}_{4}}^{\mathrm{MgO}}\). d Overall, there is a decrease in conductivity with an increase in FWHM of the (002)BLSO XRD peak in the \({\mathrm{BLSO}}_{{\mathrm{MgAl}}_{2}{\mathrm{O}}_{4}}^{\mathrm{MgO}}\) films. The 5%-\({\mathrm{BLSO}}_{{\mathrm{MgAl}}_{2}{\mathrm{O}}_{4}}^{\mathrm{MgO}}\) film shows the lowest level of electron scattering and highest conductivity