Abstract
Fine nickel fibers have been synthesized by chemical reduction of nickel ions in aqueous medium with sodium borohydride. The thermal stability and relevant properties of these fibers, as-prepared as well as air-annealed, have been investigated by structural, magnetic and electrical measurements. As-prepared samples appear to have a novel crystal structure due to the presence of interstitial oxygen. Upon annealing in air, the fcc-Ni phase emerges out initially and develops into a nanocomposite subsequently by retaining its fiber-like structure in nano phase. The as-prepared sample is observed to be weakly magnetic at room temperature, but attains surprisingly high magnetization values at low temperatures. This is attributed to the modified spin structure, presumably due to the presence of interstitial oxygen in the lattice. Development of a weakly ferromagnetic and electrically conducting phase upon annealing in air is attributed to the formation of the fcc-Ni phase. The structural phase transformations corroborate well with magnetic and electrical measurements.
Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in;
[1]
Barik, S K;
Bodo, Bhaskarjyoti;
[1]
Karmakar, Debjani;
Chandrasekhar Rao, T V
[2]
- Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur West Bengal 721 302 India (India)
- Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Bombay 400085 India (India)
Citation Formats
Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in, Barik, S K, Bodo, Bhaskarjyoti, Karmakar, Debjani, and Chandrasekhar Rao, T V.
Magnetic and electrical properties of oxygen stabilized nickel nanofibers prepared by the borohydride reduction method.
Netherlands: N. p.,
2008.
Web.
doi:10.1016/j.jmmm.2007.08.034.
Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in, Barik, S K, Bodo, Bhaskarjyoti, Karmakar, Debjani, & Chandrasekhar Rao, T V.
Magnetic and electrical properties of oxygen stabilized nickel nanofibers prepared by the borohydride reduction method.
Netherlands.
https://doi.org/10.1016/j.jmmm.2007.08.034
Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in, Barik, S K, Bodo, Bhaskarjyoti, Karmakar, Debjani, and Chandrasekhar Rao, T V.
2008.
"Magnetic and electrical properties of oxygen stabilized nickel nanofibers prepared by the borohydride reduction method."
Netherlands.
https://doi.org/10.1016/j.jmmm.2007.08.034.
@misc{etde_21046843,
title = {Magnetic and electrical properties of oxygen stabilized nickel nanofibers prepared by the borohydride reduction method}
author = {Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in, Barik, S K, Bodo, Bhaskarjyoti, Karmakar, Debjani, and Chandrasekhar Rao, T V}
abstractNote = {Fine nickel fibers have been synthesized by chemical reduction of nickel ions in aqueous medium with sodium borohydride. The thermal stability and relevant properties of these fibers, as-prepared as well as air-annealed, have been investigated by structural, magnetic and electrical measurements. As-prepared samples appear to have a novel crystal structure due to the presence of interstitial oxygen. Upon annealing in air, the fcc-Ni phase emerges out initially and develops into a nanocomposite subsequently by retaining its fiber-like structure in nano phase. The as-prepared sample is observed to be weakly magnetic at room temperature, but attains surprisingly high magnetization values at low temperatures. This is attributed to the modified spin structure, presumably due to the presence of interstitial oxygen in the lattice. Development of a weakly ferromagnetic and electrically conducting phase upon annealing in air is attributed to the formation of the fcc-Ni phase. The structural phase transformations corroborate well with magnetic and electrical measurements.}
doi = {10.1016/j.jmmm.2007.08.034}
journal = []
issue = {6}
volume = {320}
place = {Netherlands}
year = {2008}
month = {Mar}
}
title = {Magnetic and electrical properties of oxygen stabilized nickel nanofibers prepared by the borohydride reduction method}
author = {Srinivas, V. , E-mail: veeturi@phy.iitkgp.ernet.in, Barik, S K, Bodo, Bhaskarjyoti, Karmakar, Debjani, and Chandrasekhar Rao, T V}
abstractNote = {Fine nickel fibers have been synthesized by chemical reduction of nickel ions in aqueous medium with sodium borohydride. The thermal stability and relevant properties of these fibers, as-prepared as well as air-annealed, have been investigated by structural, magnetic and electrical measurements. As-prepared samples appear to have a novel crystal structure due to the presence of interstitial oxygen. Upon annealing in air, the fcc-Ni phase emerges out initially and develops into a nanocomposite subsequently by retaining its fiber-like structure in nano phase. The as-prepared sample is observed to be weakly magnetic at room temperature, but attains surprisingly high magnetization values at low temperatures. This is attributed to the modified spin structure, presumably due to the presence of interstitial oxygen in the lattice. Development of a weakly ferromagnetic and electrically conducting phase upon annealing in air is attributed to the formation of the fcc-Ni phase. The structural phase transformations corroborate well with magnetic and electrical measurements.}
doi = {10.1016/j.jmmm.2007.08.034}
journal = []
issue = {6}
volume = {320}
place = {Netherlands}
year = {2008}
month = {Mar}
}