Untitled

Sarkar, Mitesh; Patel, Narendra; Mehta, P. K.; Somayajulu, D. R. S.

doi:10.1023/a:1020595329647

Cited by 4 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the existence of Fe 2+ in fivefold and sixfold coordination was confirmed previously by a neutron diffraction study [30]. On the other hand, the existence of both Fe 2+ and Fe 3+ in fivefold coordination (bipyramidal coordination) are observed in phosphate glass and some iron minerals [24,[44][45][46][47][48][49][50].…”

Section: Discussionsupporting

confidence: 61%

Mössbauer and differential thermal analysis studies of iron alkali lead-phosphate glasses

El-Denglawey¹,

Saddeek²,

El-Bahnasawy³

et al. 2020

Phys. Scr.

View full text Add to dashboard Cite

This work reports on the effect of the increment of Fe2O3 in a network of phosphate glasses involving Al2O3, Na2O and PbO by DTA and Mössbauer techniques. The analysis of Mössbauer suggests oxidation of Fe2+ ions in the distorted bipyramidal to Fe3+ in the same site. This procedure creates non-bridging oxygens joined with Fe2+ octa that weakens the phosphate network whenever the Fe2O3 content increases. The thermal parameters of the phosphate network will be affected by this weakness. Thus, both the glass transition temperature (T gl ) and the crystallization peak temperature (T cp ) on the one hand and the activation energies for glass transition E gl and for crystallization (E gl and E cp ) on the other hand will decrease as a function of Fe2O3. This decrease will be discussed following Lasocka’s relationships that present a good correlation between T gl and T cp . Furthermore, the glass transition temperature (T gl ) was correlated with the glass fragility (m) and with the elastic parameters of the phosphate network such as the bulk (K) and shearing (G) moduli.

show abstract

Section: Discussionsupporting

confidence: 61%

Mössbauer and differential thermal analysis studies of iron alkali lead-phosphate glasses

El-Denglawey¹,

Saddeek²,

El-Bahnasawy³

et al. 2020

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…There is only little information about Mn substitution in the Y123 compound. The results of Mössbauer study show that Mn preferentially substitutes for Cu in CuO chains [13]. It seems therefore that at nominal concentration x = 0.02 the real concentration of Mn in the Y123 lattice is close to x = 0.0013.…”

Section: Resultsmentioning

confidence: 90%

The peak effect induced by Al and Mn in top-seeded melt-grown YBCO bulk superconductors

Diko¹,

Antal²,

Kaňuchová³

et al. 2009

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The effects of Al and Mn doping in top-seeded melt-grown YBCO (yttrium barium copper oxide) bulk superconductors are studied. It is shown that Al and Mn can substitute in the Y123 lattice, as reflected by a peak effect in the field dependence of the critical current density at 77 K. It is also shown that the formation of a Cu2Mn3Ba6Oy compound can be responsible for a deviation from the behavior expected for Mn addition. The influence of an oxygenation procedure on the peak effect caused by Al is presented.

show abstract