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Zero-Field Splitting Parameters of Cr^{3+} in Lithium Potassium Sulphate at Orthorhombic Symmetry Site

100%
Pandey S., Kripal R.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 1
101-105
EN
The superposition model is used to investigate the crystal field parameters, B_{kq} of Cr^{3+} in lithium potassium sulphate. The zero field splitting parameters D and E are then determined using microscopic spin Hamiltonian theory and compared with the experimental values obtained by electron paramagnetic resonance. Both zero field splitting parameters D and E evaluated theoretically are in good agreement with the experimental values. The results suggest that the Cr^{3+} ion occupies substitutional K^{+} site in lithium potassium sulphate.
2
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A Theoretical Analysis of Zero Field Splitting of Mn^{2+} in Ammonium Oxalate Monohydrate

100%
Kripal R., Pandey S.
Acta Physica Polonica A
|
2010
|
vol. 118
|
issue 4
629-632
EN
The superposition model has been used to investigate the substitution of Mn^{2+} in ammonium oxalate monohydrate. The zero field splitting parameters D and E calculated by the superposition model are compared with the experimental values D_{exp} and E_{exp}, respectively, for Mn^{2+} obtained by electron paramagnetic resonance. Both the zero field splitting parameters D and E calculated theoretically are in good agreement with the experimental values D_{exp} and E_{exp}. The result indicates that the Mn^{2+} ion substitutes for the NH_4^{+} ion in ammonium oxalate monohydrate.
3
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Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces

52%
Yadav T., Mishra S., Pandey S., Singh D., Lowe M., Tamura R., Mukhopadhyay N., Srivastava O., McGrath R., Sharma H.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 2
629-632
EN
In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline (i-Al_{63}Cu_{25}Fe_{12}) as well as crystalline (B2 phase; Al_{55}Cu_{30}Fe_{15}) alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 1-8 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the Al-Cu-Fe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of different microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of different surface orientations.
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