Influence of nanometric microstructural development on thermophysical properties of lanthanum-doped strontium titanate

The evolution of imperfect crystal from a highly amorphous structure to an ordered crystalline via sintering has demonstrated significant development onto the thermophysical properties. Therefore, series La-doped strontium titanate with different morphological properties have been synthesized high energy ball milling subsequent sintering. Doping lanthanum tends inhibit grain growth where reduction size (range 34 nm 0.47 μm) could be observed. A large amount boundaries presence fine grains, resulting doping, enhanced phonon scattering, thus yielding low heat propagation in SrTiO 3 . Besides acting as inhibitor, also acts scattering centre due imperfection created by doping. mechanisms significantly decrease mean free path. Consequently, thermal diffusivity efficiently reduced 1.1 mm 2 /s compared that pure which showed value about 3.8 /s, both observed for complete phase polycrystalline materials. systematic and can served preliminary guide engineer thermoelectric materials diffusivity. • Grain was inhibited nanometric grains. Nanometric grains limit transfer crystals. Thermal doped 3.