Lanthanum hexaaluminate is a promising competitor to establish yttria partially stabilized zirconia as a thermal barrier coating material for Ni-based superalloy due to its relative low intrinsic thermal conductivity and low sinterability at temperatures exceeding 1100°C. Sr2+ and Ti4+ were selected as two dopants to partially substitute the La3+ and Al3+ in LaMgAl11O19, respectively. The variation in thermal conductivity with Sr2+ and Ti4+ fractions was analyzed based on structure information provided by X-ray diffraction and Raman spectroscopy. The average crystal size of LaMgAl11O19 sintered at 1600°C for 10 min by spark plasma sintering is in nanoscale. The fully dense La1−xSrxMgAl11−xTixO19 solid solution showed a minimum thermal conductivity value (λ = 1.12 W/(m K)−1,T = 1273 K) at the composition of La0.5Sr0.5MgAl10.5Ti0.5O19,which possibly reduces from the enhanced phonon scattering due to mass and strain fluctuations at the Ln3+ and B3+ sites.
If you can't find a tool you're looking for, please click the link at the top of the page to "Go to old article view". Alternatively, view our Knowledge Base articles for additional help. Your feedback is important to us, so please let us know if you have comments or ideas for improvement.