scholarly journals Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

2019 ◽  
Vol 4 (4) ◽  
pp. 86
Author(s):  
Tomáš Kmječ ◽  
Jaroslav Kohout ◽  
Milan Dopita ◽  
Miroslav Veverka ◽  
Jan Kuriplach
Keyword(s):  
Mössbauer Spectroscopy ◽  
First Principles ◽  
Mossbauer Spectroscopy ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Magnetic Hyperfine Field ◽  
Antiferromagnetic Order ◽  
First Principles Calculations ◽  
Easy Magnetization ◽  
Mößbauer Spectroscopy

Low temperature magnetic ordering in the LiFePO 4 compound is investigated experimentally using Mössbauer spectroscopy and theoretically via first principles calculations. The evaluation of experiment carried out on a powder sample is compatible with an antiferromagnetic order of Fe ion magnetic moments. When an external magnetic field is applied, Fe magnetic moments start to deviate slightly from the [010] easy magnetization direction. These findings are confirmed by means of first principles calculations, which also suggest the magnitude of single ion magnetic anisotropy and orbital and spin-dipolar contributions to the magnetic hyperfine field, which is eventually in a good agreement with the experiment. Diffraction and magnetic measurements complement the study.

Magnetic properties of PbFe1/2Nb1/2O3: Mössbauer spectroscopy and first-principles calculations

2012 ◽  
Vol 85 (22) ◽  
Author(s):  
I. P. Raevski ◽  
S. P. Kubrin ◽  
S. I. Raevskaya ◽  
D. A. Sarychev ◽  
S. A. Prosandeev ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Mössbauer Spectroscopy ◽  
First Principles ◽  
Mossbauer Spectroscopy ◽  
First Principles Calculations ◽  
Mößbauer Spectroscopy

Amorphous Shell Formation on the Iron Particles during Mechanosynthesis in Fe2O3/Fe/(Ga,Al) Mixtures

2011 ◽  
Vol 170 ◽  
pp. 139-143 ◽  
Author(s):  
Tatiana Yu. Kiseleva ◽  
Alla A. Novakova ◽  
Tatiana S. Gendler
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Magnetic Measurements ◽  
Shell Formation ◽  
Iron Particles ◽  
Mößbauer Spectroscopy

Amorphous shell formation on the Fe-particles surface in course of mechanochemical nanocomposite synthesis in Fe2O3+Fe, Fe2O3+Al+Fe, and Fe2O3+Ga+Fe powders mixtures have been observed by Mössbauer spectroscopy and magnetic measurements.

A 57Fe Mössbauer Spectroscopy Study of the 7 K Superconductor LaFePO

2008 ◽  
Vol 63 (9) ◽  
pp. 1057-1061 ◽  
Author(s):  
Marcus Tegel ◽  
Inga Schellenberg ◽  
Rainer Pöttgen ◽  
Dirk Johrendt
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Rietveld Method ◽  
Magnetic Hyperfine Field ◽  
Polycrystalline Sample ◽  
Line Broadening ◽  
Gradient Tensor ◽  
Mößbauer Spectroscopy ◽  
Symmetric Line ◽  
Main Component

A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 1123 K. The structure was determined from single-crystal data (ZrCuSiAs type, P4/nmm, a = 3.9610(1), c = 8.5158(2) Å , Z = 2), and the phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic and becomes superconducting at 7 K after removing the ferromagnetic impurity phase Fe2P from the sample. 57Fe Mössbauer spectroscopy measurements at 298, 77, 4.2, and 4 K show single signals at isomer shifts around 0.35 mm s−1, subject to weak quadrupole splitting. At 4 K, a symmetric line broadening appears, resulting from a small transferred magnetic hyperfine field of 1.15(1) T and accompanied by an angle of 54.7(5)◦ between Bhf and Vzz, the main component of the electric field gradient tensor.

Sign in / Sign up

Export Citation Format

Share Document