Synthesis of nano-sized perovskite-type oxide with the use of polyvinyl pyrrolidone

Peer review under responsibility of The Ceramic Society of Japan and the Korean Ceramic Society.

Figures & data

Fig. 1 XRD patterns of La_0.6Sr_0.4Mn_0.6Fe_0.4O₃ obtained by heating precursors at 300–1300 °C ((a) PVP addition, (b) citrate process and (c) solid state reaction).

Table 1 Sample composition, BET surface area, and crystalline diameter for La_0.6Sr_0.4Mn_0.6Fe_0.4O₃ prepared by different processes.

	Composition	BET surface area (m^2 g^−1)	Crystalline diameter (nm) (as prepared)
PVP (600 °C)	(La0.62Sr0.38)1.00(Mn0.62Fe0.38)0.96O3−δ	31.1	23.5
Citrate process (800 °C)	(La0.65Sr0.35)1.00(Mn0.61Fe0.39)0.94O3−δ	13.4	53.8
Solid state reaction (1300 °C)	(La0.57Sr0.43)1.00(Mn0.60Fe0.40)1.02O3−δ	0.384	121.8

Fig. 2 SEM images of La_0.6Sr_0.4Mn_0.6Fe_0.4O₃ powders ((a) PVP addition (prepared at 600 °C), (b) citrate process (prepared at 800 °C) and (c) solid state reaction (prepared at 1300 °C)).

Table 2 BET surface area and crystal diameter for perovskite-type oxides prepared by the PVP method.

	BET surface area (m^2 g^−1)	Crystalline diameter (nm)
La0.8Sr0.2MnO3	30.0	17.4
La0.8Ca0.2MnO3	29.5	19.1
La0.8Sr0.2CoO3	25.2	28.2
La0.6Sr0.4Mn0.6Fe0.4O3	31.1	23.5
La0.6Ca0.4Mn0.6Fe0.4O3	31.8	23.0
La0.8Sr0.2Co0.6Fe0.4O3	26.2	32.5

Fig. 3 TG-DTA results for precursors of La_0.6Sr_0.4Mn_0.6Fe_0.4O₃ prepared by (a) PVP addition, (b) citrate process, and (c) solid state mixing. The amounts of the samples used for the measurement were 10.8 mg, 4.91 mg, and 10.3 mg, respectively.