Investigation of electron and phonon transport in Bi-doped CaMnO3 for thermoelectric applications

Thermoelectric properties of CaMnO3 ceramics produced by using powder synthesized by modified Pechini method

“…Based on the temperature values related to the maximum shrinkage rate, the sintering temperature was specified to obtain the high densification of the samples. The literature has adopted the most diverse temperatures and sintering times ranging from 1323 to 1623 K and 4 to 36 h [28][29][30][31]. Thus, it is evident that the temperatures involved in the production of CMO ceramics can be slightly reduced.…”

The effect of Sr substitution on the structural and physical properties of manganite perovskites Ca1−xSrxMnO3−δ (0 ≤ x ≤ 1)

“…On the other hand, for the samples with a hexagonal symmetry (x = 0.50/0.75/1), it increases with temperature and saturates at 0.15 mW cm À1 K À2 for temperatures higher than 600 K. The calculated value of PF at 1000 K for the pristine material is in good agreement with the reported data in the literature. 24,25,68,75 The compositions x = 0.25 and 0.50 with the orthorhombic structure showed an improvement in the PF at 1000 K compared to pristine CMO. These findings reveal that Sr substitution is beneficial to enhance the performance of CaMnO 3 in thermoelectric applications.…”

Preparation of ultralow thermal conductivity (Mg0.5Ca0.3Ba0.2) (AlSi)2O8ceramics

“…Searching for new materials with low-thermal conductivity has become one of the frontier research directions of materials researchers. According to the theoretical lattice thermal conductivity model, a material's thermal conductivity can be expressed as [16][17][18][19][20] 𝑘 = 1 3 ∫ 𝐶 𝑣 (𝜔) 𝑣 (𝜔) 𝑙 (𝜔) 𝑑𝜔 (1) where 𝐶 𝑣 , 𝑣, 𝑙, and 𝜔 represent the heat capacity, phonon group velocity, different scattering processes, and phonon frequency, respectively. According to formula (1), reducing the thermal conductivity can change the material's thermal conductivity by changing the material with low heat capacity and reducing the group velocity and mean free path of phonons.…”

“…Searching for new materials with low‐thermal conductivity has become one of the frontier research directions of materials researchers. According to the theoretical lattice thermal conductivity model, a material's thermal conductivity can be expressed as 16–20 $$\begin{equation}k = \frac{1}{3}{\rm{\;}}\smallint {C_v}\left( \omega \right)v\left( \omega \right)l\left( \omega \right)d\omega \end{equation}$$where $${C_v},\;v,\;l,{\rm{\;and\;}}\omega $$ represent the heat capacity, phonon group velocity, different scattering processes, and phonon frequency, respectively.…”