Effect of Sr content on structure and electrical properties of La1−x Sr x MnO3 from ITSOFC cathode view point

Abstract

The samples belonging to La 1−x Sr x MnO 3 series, prepared by combustion route without using fuel, exhibit crystal structural phase transition with the change in Sr content. Less than 40 mol% Sr is partially substituted in the crystal structure of LaMnO 3 . The structural phase transition from rhombohedral to cubic, cubic to tetragonal, and tetragonal to orthorhombic takes place on 40, 60, and 80 mol% addition of Sr. The highest electrical conductivity in La 0.4 Sr 0.6 MnO 3 is understood to be due to the maximum concentration of polaron. The polarons are formed due to the conversion of Mn 3+ to Mn 4+ so as to achieve electroneutrality after substitution of Sr 2+ for La 3+ .

Sr Substituted La2−xSrxNi0.8Co0.2O4+δ (0 ≤ x ≤ 0.8): Impact on Oxygen Stoichiometry and Electrochemical Properties

“…The weight loss (in %) as a function of temperature for LNCO, LSNCO5, and LSNCO10 powders are shown in Figure 3a, as an example. All the powders followed the same temperature variation pattern and show mainly two-weight losses, similar to previously reported results for other K 2 NiF 4 -type nickelates [16,31,43]. The first weight loss occurs at around 400 • C, which corresponds to the loss of oxygen over stoichiometry.…”

Investigation on Structure and Electrical Property of Perovskite Type Ba x Sr 1-x Co0.6Fe0.4O3-δ (x = 0.2–0.8) Oxides

“…With the further addition of Ba, the host lattice further expands anisotropically leading to an orthorhombic structure. Such structural change due to the partial substitution of cation with different size has also been observed for strontium substituted lanthanum manganite [28]. Figure 5 depicts the variation of Goldschmidt tolerance factor t with x.…”

Tailoring optical, magnetic and electric behavior of lanthanum strontium manganite La1−xSrxMnO3(LSM) nanopowders prepared via a co-precipitation method with different Sr2+ion contents

“…The concentration of polaron was increased with an increase in Sr content in LSM thereby the dielectric constant was decreased. 36…”