Abstract
Polycrystalline Al-doped FeCr{sub 1.7}Al{sub 0.3}S{sub 4} has been studied with X-ray diffraction, magnetization, and Moessbauer spectroscopy measurements. The crystal structure was found to be a cubic spinel with a space group of Fd-3m, and the lattice constant was 10.004 A. The magnetic susceptibility followed the Curie-Weiss law with a positive {theta}{sub cw} = 114 K, showing a ferrimagnetic behavior. The value of the magnetization at 5 K was found to be 1.12 {mu}{sub B}. Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} were obtained at various temperatures ranging from 4.2 to 300 K. Both the magnetic hyperfine field (H{sub hf}) and the polar angle ({theta}) reached their maximum values at 60 K and had similar temperature dependences. However, the azimuthal angle ({phi}) remained constant at temperatures below 60 K and started increasing with temperature at temperatures above 60 K. From the Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K, we obtained the following Moessbauer parameters: H{sub hf} = 128 kOe, {Delta}E{sub Q} = 2.42 mm/s, {theta} = 20.0 .deg. , {phi} = 0.0 .deg. , {eta} = 0.8, and R = 2.8. The isomer shift of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K was 0.83 mm/s relative to the
More>>
Citation Formats
Kim, Chin Mo, and Kim, Chul Sung.
Moessbauer studies on ferrimagnetic FeCr{sub 1.7}Al{sub 0.3}S{sub 4}.
Korea, Republic of: N. p.,
2010.
Web.
Kim, Chin Mo, & Kim, Chul Sung.
Moessbauer studies on ferrimagnetic FeCr{sub 1.7}Al{sub 0.3}S{sub 4}.
Korea, Republic of.
Kim, Chin Mo, and Kim, Chul Sung.
2010.
"Moessbauer studies on ferrimagnetic FeCr{sub 1.7}Al{sub 0.3}S{sub 4}."
Korea, Republic of.
@misc{etde_22077209,
title = {Moessbauer studies on ferrimagnetic FeCr{sub 1.7}Al{sub 0.3}S{sub 4}}
author = {Kim, Chin Mo, and Kim, Chul Sung}
abstractNote = {Polycrystalline Al-doped FeCr{sub 1.7}Al{sub 0.3}S{sub 4} has been studied with X-ray diffraction, magnetization, and Moessbauer spectroscopy measurements. The crystal structure was found to be a cubic spinel with a space group of Fd-3m, and the lattice constant was 10.004 A. The magnetic susceptibility followed the Curie-Weiss law with a positive {theta}{sub cw} = 114 K, showing a ferrimagnetic behavior. The value of the magnetization at 5 K was found to be 1.12 {mu}{sub B}. Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} were obtained at various temperatures ranging from 4.2 to 300 K. Both the magnetic hyperfine field (H{sub hf}) and the polar angle ({theta}) reached their maximum values at 60 K and had similar temperature dependences. However, the azimuthal angle ({phi}) remained constant at temperatures below 60 K and started increasing with temperature at temperatures above 60 K. From the Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K, we obtained the following Moessbauer parameters: H{sub hf} = 128 kOe, {Delta}E{sub Q} = 2.42 mm/s, {theta} = 20.0 .deg. , {phi} = 0.0 .deg. , {eta} = 0.8, and R = 2.8. The isomer shift of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K was 0.83 mm/s relative to the Fe metal, which is consistent with the Fe{sup 2+} valence state.}
journal = []
issue = {3}
volume = {56}
journal type = {AC}
place = {Korea, Republic of}
year = {2010}
month = {Mar}
}
title = {Moessbauer studies on ferrimagnetic FeCr{sub 1.7}Al{sub 0.3}S{sub 4}}
author = {Kim, Chin Mo, and Kim, Chul Sung}
abstractNote = {Polycrystalline Al-doped FeCr{sub 1.7}Al{sub 0.3}S{sub 4} has been studied with X-ray diffraction, magnetization, and Moessbauer spectroscopy measurements. The crystal structure was found to be a cubic spinel with a space group of Fd-3m, and the lattice constant was 10.004 A. The magnetic susceptibility followed the Curie-Weiss law with a positive {theta}{sub cw} = 114 K, showing a ferrimagnetic behavior. The value of the magnetization at 5 K was found to be 1.12 {mu}{sub B}. Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} were obtained at various temperatures ranging from 4.2 to 300 K. Both the magnetic hyperfine field (H{sub hf}) and the polar angle ({theta}) reached their maximum values at 60 K and had similar temperature dependences. However, the azimuthal angle ({phi}) remained constant at temperatures below 60 K and started increasing with temperature at temperatures above 60 K. From the Moessbauer spectra of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K, we obtained the following Moessbauer parameters: H{sub hf} = 128 kOe, {Delta}E{sub Q} = 2.42 mm/s, {theta} = 20.0 .deg. , {phi} = 0.0 .deg. , {eta} = 0.8, and R = 2.8. The isomer shift of FeCr{sub 1.7}Al{sub 0.3}S{sub 4} at 4.2 K was 0.83 mm/s relative to the Fe metal, which is consistent with the Fe{sup 2+} valence state.}
journal = []
issue = {3}
volume = {56}
journal type = {AC}
place = {Korea, Republic of}
year = {2010}
month = {Mar}
}