Enhanced dielectric and microwave absorption properties of CaMnO3 powders by Sr doping in the 8.2–18 GHz band

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

“…The experimental and theoretical results of cell parameters and unit cell volume are in line with other findings in the literature. 21,37,53,56–58…”

“…The experimental and theoretical results of cell parameters and unit cell volume are in line with other findings in the literature. 21,37,53,[56][57][58] The crystal/phase stability of Sr-doped pristine CaMnO 3 was analyzed based on the formation enthalpy DH f per atom. DH f of Ca 1Àx Sr x MnO 3 was calculated via the following formula: 61 where, E tot (Ca 1Àx Sr x MnO 3 ), E tot (Ca), E tot (Sr), E tot (Mn) and E tot (O) represent the total energy of magnate perovskite, Ca-, Sr-, Mn-and O-atoms, respectively, while N stands for the total number of atoms in the unit cell.…”

“…SMO is also a suitable cathode material for solid oxide fuel cells, an efficient catalyst material for water splitting reaction and a promising material for thermoelectric applications. 21–23…”

“…SMO is also a suitable cathode material for solid oxide fuel cells, an efficient catalyst material for water splitting reaction and a promising material for thermoelectric applications. [21][22][23] Despite the abovementioned applications of the CMO material, the efficiency of this material in thermoelectric applications still needs some improvements specifically in terms of electrical conductivity and Seebeck coefficient. [24][25][26] Furthermore, the lack of good transparency in both UV and visible regions of the light spectrum combined with the drawback of producing thin films limits the applicability of CMO as a suitable electron transport material for photovoltaic cells.…”

“…36 Recently, many experimental and theoretical studies have been performed to examine the physicochemical properties of Ca 1Àx Sr x MnO 3 manganite perovskites. Liu et al 21 have synthesized the compound Ca 1Àx Sr x MnO 3 (x r 0.1) using the solidstate reaction and they demonstrated that Sr-doping preserves the orthorhombic symmetry (Pnma) of the pristine (CMO) with an increase in the volume. Furthermore, the performance of Ca 1Àx Sr x MnO 3Àd as a microwave absorbent increases with Sr-concentration.…”