Polymer pyrolysis synthesis and magnetic properties of LaFeO3 nanoparticles

Symbiotic, low-temperature, and scalable synthesis of bi-magnetic complex oxide nanocomposites

“…However, we also observe a broad shoulder from $25-30 that indicates the presence of amorphous material in the sample. This is not unexpected since earlier studies have shown that it is necessary to anneal the as-synthesized sample at $500 C or higher for complete crystallization of LFO [24][25][26][27][28][29] and for the complete combustion of organic precursors. In the absence of hightemperature annealing, the XRPD pattern of the LFO sample shows the expected presence of amorphous content.…”

“…Three nanocomposites with phase fractions, LFO : CFO ¼ 95 : 05, 75 : 25, and 50 : 50, were prepared. We refer to these in the rest of the article as LFO(95)/CFO(05), LFO(75)/CFO (25), and LFO(50)/ CFO(50), respectively. For comparison, the end members, LFO and CFO, were also prepared using only the LFO and CFO sols, respectively.…”

“…We have seen that the assynthesized LFO(50)/CFO(50) nanocomposite is wellcrystallized without any amorphous content despite 50% of the sample consisting of LFO, which normally requires a much higher annealing temperature for crystallization (>500 C). [24][25][26][27][28][29] This is made possible because the formation of CFO proceeds with an exothermic reaction, and the heat produced is sufficient to crystallize the LFO phase at temperatures as low as 200 C, without the need for further annealing at higher temperatures. HR-TEM observations indicate that the CFO phase acts as a nucleation site for the LFO phase, thereby reducing the energy of formation of the LFO phase.…”

“…While LFO is a canted G-type antiferromagnet with a high ordering temperature of $750 K, 22 CFO, is a typical ferrimagnet (ordering temperature $800 K) exhibiting high saturation magnetization, high coercivity, and large magnetic anisotropy. 23 The synthesis of LFO, like that of many other complex oxides, requires high-temperature annealing (>500 C) for phase formation, [24][25][26][27][28][29] including the synthesis of nanocomposites where LFO is one of the components. 30,31 The synthesis technique that we report here is based on the glycine-nitrate combustion synthesis method.…”

Modification of Ce valence states by Sm/Sr co-doping of CeO 2 nanoparticles for improved magneto-electrochemical properties

“…Nanoparticles of Ce 1-x-y Sm x Sr y O 2 were synthesized using a polymer pyrolysis method as described in earlier work [19,[28][29][30][31]. Briefly, 0.006 mol each of Ce(NO 3 ) 3 ·6H 2 O (99.99%, Kanto), Sm(NO 3 ) 3 ·6H 2 O (99.99%, Aldrich) and Sr(NO 3 ) 2 (99.995%, Aldrich) and 70 ml of acrylic acid (C 3 H 4 O 2 ) were used as starting materials.…”