Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO3, La0·67Sr0·33MnO 3 and La0·67Ca0·33MnO 3): Ramifications of size considerations

Tokeer Ahmad; Kandalam V. Ramanujachary; Samuel E. Lofland; Ashok K. Ganguli

doi:10.1007/BF02703948

Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO₃, La_0·67Sr_0·33MnO ₃ and La_0·67Ca_0·33MnO ₃): Ramifications of size considerations

Tokeer Ahmad, Kandalam V. Ramanujachary, Samuel E. Lofland, Ashok K. Ganguli

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Abstract

Nanoparticles of complex manganites (viz. LaMnO₃, La _0·67Sr_0·33MnO₃ and La _0·67Ca_0·33MnO₃) have been synthesized using the reverse micellar route. These manganites are prepared at 800°C and the monophasic nature of all the oxides has been established by powder X-ray diffraction studies. TEM studies show an average grain size of 68, 80 and 50 nm for LaMnO₃, La_0·67Sr _0·33MnO₃ and La_0·67Ca _0·33MnO₃) respectively. Ferromagnetic ordering is observed at around 250 K for LaMnO₃, 350 K for La _0·67Sr_0·33MnO₃ and 200 K for La_0·67Ca_0·33MnO₃. These Curie temperatures correspond well with those reported for bulk materials with similar composition.

Original language	English (US)
Pages (from-to)	513-518
Number of pages	6
Journal	Journal of Chemical Sciences
Volume	118
Issue number	6
DOIs	https://doi.org/10.1007/BF02703948
State	Published - Nov 2006

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General Chemistry

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title = "Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO3, La0·67Sr0·33MnO 3 and La0·67Ca0·33MnO 3): Ramifications of size considerations",

abstract = "Nanoparticles of complex manganites (viz. LaMnO3, La 0·67Sr0·33MnO3 and La 0·67Ca0·33MnO3) have been synthesized using the reverse micellar route. These manganites are prepared at 800°C and the monophasic nature of all the oxides has been established by powder X-ray diffraction studies. TEM studies show an average grain size of 68, 80 and 50 nm for LaMnO3, La0·67Sr 0·33MnO3 and La0·67Ca 0·33MnO3) respectively. Ferromagnetic ordering is observed at around 250 K for LaMnO3, 350 K for La 0·67Sr0·33MnO3 and 200 K for La0·67Ca0·33MnO3. These Curie temperatures correspond well with those reported for bulk materials with similar composition.",

author = "Tokeer Ahmad and Ramanujachary, {Kandalam V.} and Lofland, {Samuel E.} and Ganguli, {Ashok K.}",

note = "Funding Information: AKG thanks the Department of Science and Technology, Govt. of India for financial support. TA thanks Council of Scientific and Industrial Research, Govt. of India for a fellowship. SEL acknowledges support from the National Science Foundation, USA.",

year = "2006",

month = nov,

doi = "10.1007/BF02703948",

language = "English (US)",

volume = "118",

pages = "513--518",

journal = "Journal of Chemical Sciences",

issn = "0253-4134",

publisher = "Indian Academy of Sciences",

number = "6",

}

Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO₃, La_0·67Sr_0·33MnO ₃ and La_0·67Ca_0·33MnO ₃): Ramifications of size considerations. / Ahmad, Tokeer; Ramanujachary, Kandalam V.; Lofland, Samuel E. et al.
In: Journal of Chemical Sciences, Vol. 118, No. 6, 11.2006, p. 513-518.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO3, La0·67Sr0·33MnO 3 and La0·67Ca0·33MnO 3)

T2 - Ramifications of size considerations

AU - Ahmad, Tokeer

AU - Ramanujachary, Kandalam V.

AU - Lofland, Samuel E.

AU - Ganguli, Ashok K.

N1 - Funding Information: AKG thanks the Department of Science and Technology, Govt. of India for financial support. TA thanks Council of Scientific and Industrial Research, Govt. of India for a fellowship. SEL acknowledges support from the National Science Foundation, USA.

PY - 2006/11

Y1 - 2006/11

N2 - Nanoparticles of complex manganites (viz. LaMnO3, La 0·67Sr0·33MnO3 and La 0·67Ca0·33MnO3) have been synthesized using the reverse micellar route. These manganites are prepared at 800°C and the monophasic nature of all the oxides has been established by powder X-ray diffraction studies. TEM studies show an average grain size of 68, 80 and 50 nm for LaMnO3, La0·67Sr 0·33MnO3 and La0·67Ca 0·33MnO3) respectively. Ferromagnetic ordering is observed at around 250 K for LaMnO3, 350 K for La 0·67Sr0·33MnO3 and 200 K for La0·67Ca0·33MnO3. These Curie temperatures correspond well with those reported for bulk materials with similar composition.

AB - Nanoparticles of complex manganites (viz. LaMnO3, La 0·67Sr0·33MnO3 and La 0·67Ca0·33MnO3) have been synthesized using the reverse micellar route. These manganites are prepared at 800°C and the monophasic nature of all the oxides has been established by powder X-ray diffraction studies. TEM studies show an average grain size of 68, 80 and 50 nm for LaMnO3, La0·67Sr 0·33MnO3 and La0·67Ca 0·33MnO3) respectively. Ferromagnetic ordering is observed at around 250 K for LaMnO3, 350 K for La 0·67Sr0·33MnO3 and 200 K for La0·67Ca0·33MnO3. These Curie temperatures correspond well with those reported for bulk materials with similar composition.

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Reverse micellar synthesis and properties of nanocrystalline GMR materials (LaMnO₃, La_0·67Sr_0·33MnO ₃ and La_0·67Ca_0·33MnO ₃): Ramifications of size considerations

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