Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples

Abstract

In this study the effects of citric acid concentration, used as organic emulsifier, on the perovskite phase formation of the nano strontium manganite or cobaltite samples were studied. Stoichiometric perovskites in the absence and presence of citric acid were prepared by drying a solution containing molar ratio of Sr(NO 3 ) 2 /Mn(NO 3 ) 2 ·4H 2 O and Sr(NO 3 ) 2 /Co(NO 3 ) 2 ·6H 2 O = 1 followed by calcination at 900 °C for 5 h. Citric acid concentration, selected to be 0.0, 0.3, 0.6, 1.0, 1.3, 2.5 and 5 times of the total number of moles of the nitrate ions. The results revealed that increase in the citric acid concentration, larger than number of moles of the nitrate ions equivalent, deteriorates the perovskite phase formation. Instead, a new phase of carbonates and metal oxides are appeared.

Synthesis of novel perovskite crystal structure phase of strontium doped rare earth manganites using sol gel method

“…[42]. There is matching with our results and theoretical predictions of the La 1-x Sr x MnO 3 system [36], these excitations could be described as mixed modes with both orbital and phonon character.…”

“…It is worth to comment that our results of Raman in Sm , and 1273 cm -1 that is associated with two phonon processes, consistent the Raman active excitations in LaMnO 3 as previously reported. [42]. There is matching with our results and theoretical predictions of the La 1-x Sr x MnO 3 system[36], these excitations could be described as mixed modes with both orbital and phonon character.…”

Electrochemical Material Processing via Continuous Charge‐Discharge Cycling: Enhanced Performance upon Cycling for Porous LaMnO3 Perovskite Supercapacitor Electrodes

“…All the four peaks situated between 400 cm −1 and 800 cm −1 corresponding to M−O stretching vibrations and O−M−O bending vibrations . The peak observed at 670 cm −1 is attributed to the La−O vibrations . While the peak present at 600 cm −1 represents the symmetric stretching vibrations of O−M−O bond associated to the MO 6 octahedron in ABO 3 type perovskite structure .…”

Fabrication and Characterization of Hexagonal SrMnO3Nanofibers by Electrospinning

“…All diffraction peaks show good consistency with JCPDS, Card No. 24-1213 of perovskite phase of SrMnO 3 [19]. A single hexagonal perovskite systerm was determined.…”

“…Due to the special skeletal structure which was consisted of a three dimensional network of MnO 6 octahedra, the SrMnO 3 sample has some properties such as oxygen nonstoichiometry, electronic properties, thermochromism, etc [15]. SrMnO 3 powders have been synthesized with many methods such as high temperature solid-state reaction, coprecipitation [16], sol-gel, etc [17][18][19][20]. High temperature solid-state reactions need a very high temperature.…”