Low intrinsic thermal conductivity of Spark Plasma Sintered dense KNbO3 and NaNbO3 perovskite ceramics

High thermal insulation properties of A2FeCoO6−δ (A = Ca, Sr)

“…In such a case, the grain size contribution can be ignored for their thermal conductivity difference, as reported in a previous work. 20 In the SEM images of both compounds, boundaries are observed, separating the grains. There is not a major difference in the grain boundaries of these two materials.…”

“…Thus, different factors play a role in the reduction of thermal conductivity of perovskite oxides. Widely discussed factors are crystal structure variations, grain size, 20 grain boundaries 11,21 and oxygen vacancies, which are associated with the increased phonon scattering, resulting in reduced thermal conductivity of the lattice. Many of the previous studies on polycrystalline materials, such as perovskite oxides, discuss oxygen vacancies or defect generation that increase the phonon scattering, resulting in the thermal conductivity reduction.…”

“…The lower the grain size, the higher the phonon scattering and the lower the thermal conductivity. 20,32 The total thermal conduction is generally considered as the sum of the contributions from phonons and photons (radiation)…”

“…The lower the grain size, the higher the phonon scattering and the lower the thermal conductivity. 20,32…”

Effect of La(Nb1/3Mg2/3)O3 addition on phase transition behavior and energy storage properties of NaNbO3 ceramics

“…[29][30][31] This is caused by the electric-induced metastable ferroelectric phase. 32) However, its phase structures and relatively large polarization (30 μC cm −2 ) are favorable to advance energy storage performance, 7,32) such as novel preparation approaches, 33) electric field induction, 34) and chemical modification. [35][36][37] Chemical modification is the most interested, previous researches have demonstrated that composition variation is a flexible way to tailor and stabilize the AFE domains of NN ceramics.…”