Hydrothermal synthesis of perovskite strontium doped lanthanum chromite fine powders and its sintering

Template-free molten salt synthesis of pure and Sr-doped LaCrO3 1D nanorods with enhanced electrical transport properties

“…41,42 Typically, 20% Sr 2+ doping in LaCrO 3 is sufficient to realize maximum conductivity in LSCO. 26,43,44…”

“…41,42 Typically, 20% Sr 2+ doping in LaCrO 3 is sufficient to realize maximum conductivity in LSCO. 26,43,44 Role of the anion on the growth of LCO nanorods For MSS, a eutectic mixture (1 : 1 ratio) of NaCl-KCl salt is extensively used for the synthesis of various metal-oxide nanomaterials with controlled morphology. 27 It has a lower melting point of 658 1C than that of separate salts and can easily be removed by simply washing with distilled water.…”

Perovskite Oxides Prepared by Hydrothermal and Solvothermal Synthesis: A Review of Crystallisation, Chemistry, and Compositions

“…Early work on the hydrothermal synthesis of chromite perovskites, ACrO3 (A = trivalent cation, such as a rare-earth) in the 1980s, used high temperatures and hence high autogeneous pressures to bring about crystal growth: using 400 C and 100 MPa to form LaCrO3, for example. [166] Sr-substituted lanthanum chromite powders, with partial oxidation of chromium above +3, with two different compositions, La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3 were produced by similar high temperature/pressure methods, [167] Ca-substituted LaCrO3 was prepared by Rivas-Vazquez et al above 350 C, [168] while Zheng et al found that the temperature of synthesis of LaCrO3 could be lowered to 260 C if high KOH concentrations were used as reaction medium. [169] In our own work we found that temperatures above 300 o C were needed to induce crystallisation of ACrO3 perovskites, from an initial precipitate of an amorphous mixedmetal hydroxide, but this then led to highly crystalline specimens for A = La, Pr, Sm, Gd, Dy, Ho, Yb, Lu and Y), [170] for which a detailed Raman spectroscopic study was made to provide benchmark spectra for the family of materials.…”