Print Email Facebook Twitter Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O Title Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O Author Khaliq, J. Li, C. Chen, K. Shi, B. Ye, H. Grande, A.M. Yan, H. Reece, M.J. Faculty Aerospace Engineering Department Aerospace Structures & Materials Date 2015-02-18 Abstract The effect of substitution and oxidation-reduction on the thermal conductivity of perovskite-like layered structure (PLS) ceramics was investigated in relation to mass contrast and non-stoichiometry. Sr (acceptor) was substituted on the A site, while Ta (donor) was substituted on the B site of La2Ti2O7. Substitution in PLS materials creates atomic scale disorders to accommodate the non-stoichiometry. High resolution transmission electron microscopy and X ray diffraction revealed that acceptor substitution in La2Ti2O7 produced nanoscale intergrowths of n?=?5 layered phase, while donor substitution produced nanoscale intergrowths of n?=?3 layered phase. As a result of these nanoscale intergrowths, the thermal conductivity value reduced by as much as ?20%. Pure La2Ti2O7 has a thermal conductivity value of ?1.3?W/m K which dropped to a value of ?1.12?W/m K for Sr doped La2Ti2O7 and ?0.93?W/m K for Ta doped La2Ti2O7 at 573?K. To reference this document use: http://resolver.tudelft.nl/uuid:2f36e570-3a42-475b-b80f-b6a285e51295 Publisher American Institute of Physics ISSN 0021-8979 Source https://doi.org/10.1063/1.4908209 Source Journal of Applied Physics, 117 (7), 2015 Part of collection Institutional Repository Document type journal article Rights (c) 2015 American Institute of Physics Files PDF 316956.pdf 1.32 MB Close viewer /islandora/object/uuid:2f36e570-3a42-475b-b80f-b6a285e51295/datastream/OBJ/view