Magnetic and electrical characterization of Mg_1−xK_xB₂ synthesized from MgB₂ and KCl powders

Authors

Denis D. Aquino ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Ken Ryner H. So ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Margie P. Olbinado ⋅ PH National Institute of Physics, University of the Philippines Diliman
Roland V. Sarmago ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

This paper reports the effect of doping MgB₂ with K⁺ at different concentrations and sintered at 830°C in its superconducting properties. Samples of Mg_1−xK_xB₂ with 0 ≤ x ≤ 0.5 were prepared and were subjected to SEM, XRD, R-T, I-V and susceptibility measurements. A maximum Tc of 38.4K was achieved at x=0.2 while a decrease in lattice parameter a for doped MgB₂ indicated the successful substitution of K⁺ in Mg sites. K⁺ doping was found to affect the critical temperature of Mg_1−xK_xB₂ in which the hole theory governs before K⁺ saturation and on the other hand the phonon-mediated theory governs after K⁺ saturation. The saturation was found to lie at 0.15 ≤ x ≤ 0.2.

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Issue

2005: Proceedings of the 23rd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2005-PA-27

Section

Poster Session PA

Published

2005-10-26

How to Cite

[1]

DD Aquino, KRH So, MP Olbinado, and RV Sarmago, Magnetic and electrical characterization of Mg1−xKxB2 synthesized from MgB2 and KCl powders, Proceedings of the Samahang Pisika ng Pilipinas 23, SPP-2005-PA-27 (2005). URL: https://proceedings.spp-online.org/article/view/SPP-2005-PA-27.