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Title: Thermal and magnetic properties of nanostructured densified ferrimagnetic composites with graphene - graphite fillers

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1413339
Grant/Contract Number:
SC0012670
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 118; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-14 02:19:03; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Ramirez, S., Chan, K., Hernandez, R., Recinos, E., Hernandez, E., Salgado, R., Khitun, A. G., Garay, J. E., and Balandin, A. A. Thermal and magnetic properties of nanostructured densified ferrimagnetic composites with graphene - graphite fillers. United Kingdom: N. p., 2017. Web. doi:10.1016/j.matdes.2017.01.018.
Ramirez, S., Chan, K., Hernandez, R., Recinos, E., Hernandez, E., Salgado, R., Khitun, A. G., Garay, J. E., & Balandin, A. A. Thermal and magnetic properties of nanostructured densified ferrimagnetic composites with graphene - graphite fillers. United Kingdom. doi:10.1016/j.matdes.2017.01.018.
Ramirez, S., Chan, K., Hernandez, R., Recinos, E., Hernandez, E., Salgado, R., Khitun, A. G., Garay, J. E., and Balandin, A. A. Wed . "Thermal and magnetic properties of nanostructured densified ferrimagnetic composites with graphene - graphite fillers". United Kingdom. doi:10.1016/j.matdes.2017.01.018.
@article{osti_1413339,
title = {Thermal and magnetic properties of nanostructured densified ferrimagnetic composites with graphene - graphite fillers},
author = {Ramirez, S. and Chan, K. and Hernandez, R. and Recinos, E. and Hernandez, E. and Salgado, R. and Khitun, A. G. and Garay, J. E. and Balandin, A. A.},
abstractNote = {},
doi = {10.1016/j.matdes.2017.01.018},
journal = {Materials & Design},
number = C,
volume = 118,
place = {United Kingdom},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.matdes.2017.01.018

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • Highlights: • Effect of raw graphite particle size on properties of GO and graphene is reported. • Size of raw graphite affects oxidation degree and chemical structure of GO. • Highly oxidized GO results in small-sized but well-exfoliated graphene. • GO properties affect reduction degree, structure, and conductivity of graphene. - Abstract: We report the effect of raw graphite size on the properties of graphite oxide and graphene prepared by thermal reduction–exfoliation of graphite oxide. Transmission electron microscope analysis shows that the lateral size of graphene becomes smaller when smaller size graphite is used. X-ray diffraction analysis confirms that graphitemore » with smaller size is more effectively oxidized, resulting in a more effective subsequent exfoliation of the obtained graphite oxide toward graphene. X-ray photoelectron spectroscopy demonstrates that reduction of the graphite oxide derived from smaller size graphite into graphene is more efficient. However, Raman analysis suggests that the average size of the in-plane sp{sup 2}-carbon domains on graphene is smaller when smaller size graphite is used. The enhanced reduction degree and the reduced size of sp{sup 2}-carbon domains contribute contradictively to the electrical conductivity of graphene when the particle size of raw graphite reduces.« less
  • This paper presents the structural and magnetic properties of La{sub 0.6}Sr{sub 0.4}MnO{sub 3} nanoparticles with sizes from 21 to 106 nm, which have been prepared using the sol–gel method. The reduction of the nanoparticles' size tends to broaden the paramagnetic to ferromagnetic transition, as well as to promote magnetic hysteresis and a remarkable change on the magnetic saturation. In order to better understand the magnetic behavior of those nanoparticles, a simple model based on a ferromagnetic core and a ferrimagnetic shell was considered, where the magnetization was described in terms of the standard mean-field Brillouin function. This model matches themore » experimental data, leading to conclusion the nanoparticles with size <40nm are single magnetic domain. In addition, the output fitting parameters give information on the Landé factor of the core and shell. - Graphical abstract: Core–shell model: The core has a ferromagnetic character, while the shell is ferrimagnetic. Each one has two sub-lattices (Mn{sup 3+} and Mn{sup 4+}) that interact through a mean-field (see Eq. (6)). Interactions strength and signals are also represented in this figure. In this figure the arrows (or vectors) represent the magnetic moment of ions Mn{sup 3+} (s=2) and Mn{sup 4+} (s=3/2). βλ's describe the ferromagnetic interaction between Mn{sup 4+} ions into the core (βλ{sub co}) and into the shell (βλ{sub sh}), while αλ's represent ferromagnetic interaction between Mn{sup 3+} ions into the core (αλ{sub co}) and into the shell (αλ{sub sh}). The −λ{sub sh} and +λ{sub co}co are associated to the mean field parameter of interaction between Mn{sup 3+} and Mn{sup 4+} sub-lattices in the shell (ferrimagnetic, negative sign) and core (ferromagnetic, positive sign), respectively. - Highlights: • Evidences of ferromagnetic shell in La{sub 0.6}Sr{sub 0.4}MnO{sub 3} ferromagnetic nanoparticles. • Core(ferromagnetic)–shell(ferromagnetic) model for nanostructured manganite. • Sol–gel method was successfully used to obtain nanostructured manganite.« less