Effect of preparative methods on electrical and electrochemical performance of lanthanum strontium manganite

Abstract

The electrochemical performance of La 0.8 Sr 0.2 MnO 3 : Ce 0.8 Gd 0.2 O 2 composite cathode was investigated for solid oxide fuel cell applications. Sol-gel, combustion, and solidstate syntheses yielded rhombohedral La 0.8 Sr 0.2 MnO 3 , whereas mechanochemical process gave cubic structure. X-ray diffraction results established good chemical stability of La 0.8 Sr 0.2 MnO 3 with Ce 0.8 Gd 0.2 O 2 composite cathode. Combustion synthesis was found best among all preparative methods on the basis of lowest area specific resistance 0.70 Ω cm 2 at 800°C. The activation energy E a =1.09±0.01 eV indicated absorption of O 2 and was the rate-limiting process of cathode.

Influence of Thickness on the Magnetic and Magnetotransport Properties of Epitaxial La0.7Sr0.3MnO3 Films Deposited on STO (0 0 1)

“…Moreover, the room temperature magnetocaloric effect (with different substitutions on the Mn site, such as Ni [13][14][15], Co [16] Cr, St, Ti [17] or with no substitutions at all [18,19]), large planar Hall effect in La 0.7 Sr 0.3 MnO 3 films on MgO (1 0 0) [20], as well as magnetoelastic coupling at the interface between the La 2/3 Sr 1/3 MnO 3 thin films and SrTiO 3 (STO) substrate (due to the STO cubic-tetragonal transition [21]), can be noted. All of these above mentioned magneto-functionalities make La 1−x Sr x MnO 3 systems outstanding candidates for magnetic field sensors [22,23], high-density memory storage devices, tunnel magneto-resistance devices [24,25], pressure sensors [26], micro and nanomechanical resonant sensors [27], solid oxide fuel cells [28], spin injectors in organic spintronics [29] and references therein, non-volatile memory and memristive devices [30], spin light emitting diodes [31], organic light emitting devices (OLEDs) [32,33], spin wave resonance devices [34], uncooled infrared bolometers [35], microwave [36] and radio frequency [37] applications.…”