Solid-state synthesis of LaSrMnO 3 powders for smart coatings

Investigation of thermal control in phase-changing ABO3 perovskites via first-principles predictions: general mechanism of emittance

“…14 Another material, Ge 2 Sb 2 Te 5 , has been found to exhibit extraordinarily low (near zero) emission below 1073 K and a high emissivity of B1.0 above 1073 K. 15 Both pure (La,Sr)MnO 3 and doped (La,Sr)MnO 3 have also been examined experimentally. [16][17][18] The maximum emittance variation of bulk La 0.825 Sr 0.175 MnO 3 was found to be 0.546 in the 1.25-25 mm waveband at temperatures of 173-373 K. 19 The La 0.7 Ca 0.12 Sr 0.18 MnO 3 /ALO/Ag/mica structure was found to exhibit a remarkably tunable emissivity, and its emittance variation was found to be 0.53 and 0.63 in the wavelength ranges 3-5 mm and 8-14 mm, respectively, at temperatures of 173-373 K. 20 In comparison, the emittance variations of an La 0.8 Sr 0.2 MnO 3 coating were found to be only 0.041 and 0.007 under the same conditions. 21 Meanwhile, there have been several different proposed explanations for the coupling relationship between phase changes and emittance.…”

“…21 Meanwhile, there have been several different proposed explanations for the coupling relationship between phase changes and emittance. These include the ideas that: (1) metallic oxides usually have lower bandgaps, fewer phonons, and more free electrons than insulators, which reduces their infrared transmittance and results in less infrared emittance than from insulating oxides; 22 (2) the paramagnetic-ferromagnetic transition is caused by double exchange, which is affected by B-O bonds, and this in turn affects the radiation performance; 16 (3) the electron-phonon interactions and lattice polarization resulting from the Jahn-Teller effect changes the radiation performance. 17 However, these explanations are only applicable to some metal-insulator transition systems, and they are superficial interpretations that are not universal.…”

Investigation of thermal control in phase-changing ABO3 perovskites via first-principles predictions: general mechanism of solar absorptivity

“…Meanwhile, the large solar absorbance (B0.8) of LSMO and doped LSMO has also limited their application in the field of intelligent thermal control. [23][24][25][26][27] Thus, investigating the more universal mechanisms of solar absorbance during phase changes is very challenging. Resolving the following issues is required for enabling intelligent, thermally controlled materials: (i) understanding how the crystal structures, electrons, and magnetism of these phasechanging materials affect the solar absorbance during the phasechanging processes in general materials; and (ii) determining what atomistic and crystalline characteristic perovskite has a tunable solar absorptivity.…”

Oxide material synthesis by combustion of organic-inorganic compositions

“…These methods for oxide material synthesis have been proposed as alternative for solid-phase synthesis of oxide reagents, the implementation of which requires, as a rule, hightemperature and long-term cyclic thermal powder treatment [19][20][21][22][23][24][25]. It should be noted that there are methods for solid-phase synthesis with high-rate solid-phase chemical oxide interaction, however, the number of such methods is limited [26][27][28][29][30][31][32][33].…”