On the Study of Racah Parameter B for Nickel (II) and Cobalt (II) Compounds

Authors

  • Mohamad M.E. Shakdofa University of Jeddah, P.O. Box 80200, 21589 Khulais, Jeddah, Saudi Arabia
  • Kamal A. Aly University of Jeddah, Jeddah, Saudi Arabia
  • Pankaj Sharma Jaypee University of Information Technology, Waknaghat,Solan, H.P. – 173234, India
  • Gomaa A. M. Ali Al-Azhar University, Assiut branch, Assiut 71524, Egypt

DOI:

https://doi.org/10.15377/2409-5826.2017.04.5

Keywords:

Racah parameter, Metallic composites, Electronic transition.

Abstract

 The ligand field strength (Dq) and interelectronic repulsion (B) have been calculated for nickel (II) and cobalt (II) compounds by Underhill and Billing [1] based on v2 and v3 values. They solved the quadratic equation 340(Dq2-18(v2+v3) Dq+ v2 v3=0 in Dq for octahedral. Then, the B value was determined using the equation v2+ v3−30Dq−15B=0. But, the first equation has real and imaginary solutions and it’s difficult to determine the imaginary one. In addition, in many cases there is no solution of this equation as well as in the case of CoO (d7 oct.). For octahedral, the above two equations can be considered as a system of two equations with two unknowns which can be solved if we have v2 and v3 values and vice versa. Similarly, for tetrahedral, the former two equations also can be solved for Dq and B. Using Newton–Raphson iterations, Dq and B values are exactly determined for octahedral and tetrahedral systems. The obtained values of Dq and B were compared with those previously reported.

Author Biographies

Mohamad M.E. Shakdofa, University of Jeddah, P.O. Box 80200, 21589 Khulais, Jeddah, Saudi Arabia

Chemistry Department, Faculty of Science and Arts

Kamal A. Aly, University of Jeddah, Jeddah, Saudi Arabia

Physics Department, Faculty of Science and Arts, P.O. Box 80200, 21589 Khulais

Pankaj Sharma, Jaypee University of Information Technology, Waknaghat,Solan, H.P. – 173234, India

Department of Physics and Materials Science

Gomaa A. M. Ali, Al-Azhar University, Assiut branch, Assiut 71524, Egypt

Chemistry Department, Faculty of Science

References

Underhill AE and Billing DE. Calculations of the Racah Parameter B for Nickel (II) and Cobalt (II) Compounds, Nature 1966; 210: 834-835. https://doi.org/10.1038/210834a0

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Published

2017-12-31

How to Cite

1.
Mohamad M.E. Shakdofa, Kamal A. Aly, Pankaj Sharma, Gomaa A. M. Ali. On the Study of Racah Parameter B for Nickel (II) and Cobalt (II) Compounds. J. Adv. Therm. Sci. Res. [Internet]. 2017Dec.31 [cited 2021Sep.26];4(1):31-3. Available from: https://www.avantipublishers.com/jms/index.php/jatsr/article/view/863

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