Alkali metal substitution effects in Mg1−xAxB2 (A=Li and Na)

Li, S.Y; Xiong, Y.; Mo, W. Q.; Fan, Ren‐Hao; Wang, C.H; Luo, X. G.; Sun, Ze; Zhang, H.T; Li, L; Cao, Lei; Chen, X.H

doi:10.1016/s0921-4534(01)01071-1

Cited by 37 publications

(17 citation statements)

References 2 publications

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“…In the last five years, various carbon sources, [1][2][3] silicates, 4 single elements, 5,6 carbohydrates, 7 organic acids, 8 and other compounds 9,10 have been doped in MgB 2 and reported. It has become more clear that structural defects with dimensions at nanoscale play an important role for flux pinning, i.e., nanoparticle doping is the most effective approach to improve the superconducting performance of MgB 2 and making MgB 2 acceptable for practical applications.…”

Section: Introductionmentioning

confidence: 99%

High field performance of nanodiamond doped MgB2 superconductor

Vajpayee

Awana

Kishan

et al. 2008

Journal of Applied Physics

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The results from magnetotransport and magnetization of nanodiamond doped MgB 2 -nD x are reported. Superconducting transition temperature (T c ) is not affected significantly by x up to x =0.05 and latter decreases slightly for higher x>0.05. R(T) vs H measurements show higher T c values under same applied magnetic fields for the nanodiamond added samples, resulting in higher estimated Hc 2 values. From the magnetization measurements, it was found that irreversibility field value H irr for the pristine sample is 7.5 T at 4 K and the same is increased to 13.5 T for 3 wt % nD added sample at the same temperature. The J c (H) plots at all temperatures show that J c value is lowest at all applied fields for pristine MgB 2 and the sample doped with 3 wt % nD gives the best J c values at all fields. These results are discussed in terms of extrinsic pinning due to dispersed n-diamond in the host MgB 2 matrix along with the intrinsic pinning due to possible substitution of C at boron site and increased interband scattering for highly doped samples resulting in extraordinary performance of the doped system. KeywordsHigh, field, performance, nano, diamond, doped, MgB2, superconductor The results from magnetotransport and magnetization of nanodiamond doped MgB 2 -nD x are reported. Superconducting transition temperature ͑T c ͒ is not affected significantly by x up to x = 0.05 and latter decreases slightly for higher x Ͼ 0.05. R͑T͒ vs H measurements show higher T c values under same applied magnetic fields for the nanodiamond added samples, resulting in higher estimated H c2 values. From the magnetization measurements, it was found that irreversibility field value H irr for the pristine sample is 7.5 T at 4 K and the same is increased to 13.5 T for 3 wt % nD added sample at the same temperature. The J c ͑H͒ plots at all temperatures show that J c value is lowest at all applied fields for pristine MgB 2 and the sample doped with 3 wt % nD gives the best J c values at all fields. These results are discussed in terms of extrinsic pinning due to dispersed n-diamond in the host MgB 2 matrix along with the intrinsic pinning due to possible substitution of C at boron site and increased interband scattering for highly doped samples resulting in extraordinary performance of the doped system.

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Section: Introductionmentioning

confidence: 99%

High field performance of nanodiamond doped MgB2 superconductor

Vajpayee

Awana

Kishan

et al. 2008

Journal of Applied Physics

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“…However, T c of MgB 2 has not been enhanced in any substitutions/doping case. Nano SiC [13], Ti addition [14][15][16], C [17], ZrSi 2 and WSi 2 additions [18], Zn and Al double [19], Zr and Hf additions [20], Ir substitution [21], Pb substitution [22], Li and Na additions [23,24], Ag addition [25], Sn, Co and Fe addition [26], Ti, Zr, Mo, Mn, Fe, Ca, Al, Ag, Cu, Y, Ho additions [27,28] and Cr addition [29] were found to have a crucial role on the flux-pinning, critical current density and also irreversibility field of MgB 2 material. However, most of the substitutions/dopings have led to small or large decrease on T c or completely depression of superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Co-addition into MgB2: The structural and electronic properties of (MgB2)2−xCox

Aksan

Yakıncı

Güldeste

2006

Journal of Alloys and Compounds

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“…(64 pm, similar as the radius of Mg 2? ) [16,17] is much closer to the radius of Al 3? (54 pm) [18] than that of La 3?…”

Section: Resultsmentioning

confidence: 92%

Microwave dielectric properties of Al2O3 ceramics co-doped with MgO and Nb2O5

Zhang

Yuan

et al. 2015

J Mater Sci: Mater Electron

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In this paper, the influence of MgO/Nb 2 O 5 codoping on the microstructure and microwave dielectric properties of Al 2 O 3 ceramics has been investigated. Comparing with only MgO doped samples, the introducing of Nb 2 O 5 can further promote the densification progress and improve the microwave dielectric properties. A high Q 9 f value of 216,894 GHz could be obtained with 500 ppm MgO/500 ppm Nb 2 O 5 co-doped sample. Besides, MgO/Nb 2 O 5 co-doping could increase the stability of the Q 9 f value of the Al 2 O 3 ceramics. Charge compensation and low content of the second phase are believed to be the main reason of this high and stable Q 9 f value.

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Alkali metal substitution effects in Mg1−xAxB2 (A=Li and Na)

Cited by 37 publications

References 2 publications

High field performance of nanodiamond doped MgB2 superconductor

High field performance of nanodiamond doped MgB2 superconductor

Co-addition into MgB2: The structural and electronic properties of (MgB2)2−xCox

Microwave dielectric properties of Al2O3 ceramics co-doped with MgO and Nb2O5

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