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For the first of its kind, Cr 3 + -substituted calcium hexaferrite (CaCrxFe 1 2 − x O 1 9 (x = 1 , 3, 5 and 7)) nanoparticles (NPs) were synthesized via a facile, economical, eco-friendly lemon juice extract mediated green solution combustion method. The samples were calcined followed by characterization. The Bragg reflections confirm the formation of a single phase M-type hexaferrite crystal structure. No other impurity or mixed phases are observed even after the substitution of Cr 3 + to the host matrix. Meanwhile, the crystallite size decreases from 29.44 to 19.92 nm with an increase in the substitution of Cr 3 + ions. The surface morphological analysis shows the presence of agglomerated irregularly shaped NPs. The direct energy band gap estimated using Wood and Tauc's relation depicts the decrease in energy band gap from 2.98 to 2.74 eV with an increase in the substitution of Cr 3 + ions. These Cr 3 + -substituted calcium hexaferrite NPs were predicted to be useful in high-frequency applications based on structural, dielectric, and magnetic studies. [ABSTRACT FROM AUTHOR]

For the first of its kind ZnAl 2 O 4 : Ag (1–11 mol % ) nanomaterials (NMs) are synthesized using Tulsi leaves extract (calcination at 500 ∘ C) and subjected to characterization. Structural and electrochemical properties are analyzed. Cubic structure is verified by the Bragg reflections. Both crystallite size and direct energy band gap was found to decrease with an increase in dopant concentration. On the surface morphology, there are numerous pores and hollows. The galvanostatic, CV, EIS spectra, Discharge profile and Cyclic life profile was performed for ZnAl 2 O 4 : Ag (1 and 11 mol % ) NPs. The CV analysis showed only a pair of oxidation peaks and only one reduction peak. According to records, the precise discharge and charge capabilities are 242/214, 196/184, 161/151, 140/126 and 126/115 at 0.1, 0.25, 0.5, 1 and 2.5 C respectively. Additionally, at 2.5 C, the ZnAl 2 O 4 : Ag (1–11 mol%) anode exhibits the greatest cycle stability and Columbic efficiency even after 1000 cycles of cycling. [ABSTRACT FROM AUTHOR]

The isotopic yield and half-lives of the spontaneous fission of superheavy nuclei Z = 1 1 9 and Z = 1 2 0 are studied. First, the theoretical formalism is validated by applying it to known isotopes of superheavy nuclei which can undergo spontaneous fission. Half-lives obtained from this work indicate that all the half-lives are approximately twice when compared to experimental measurements. Thereafter, we explored the isotopic yield and half-lives of spontaneous fission for the superheavy nuclei Z = 1 1 9 and Z = 1 2 0 by studying the driving potential, yield and penetration probability. The superheavy nuclei Z = 1 1 9 can undergo alpha decay up to A = 3 0 6. Thereafter they undergo spontaneous fission. Similarly, the superheavy nuclei Z = 1 2 0 undergo spontaneous fission beyond A=309. It is observed that the superheavy nuclei Z = 1 1 9 undergo spontaneous fission through the fission fragment combination of Sn+Tm, however, the superheavy nuclei Z = 1 2 0 undergo spontaneous fission with the fragments Sn+Yb. The larger spontaneous half-life is of the order of ns from the superheavy nuclei 3 0 7 119 and 3 1 0 120. Further investigations were required in the evaluation of the anticipated fission fragment combinations and half-lives of 3 0 7 − 3 1 0 119 and 3 1 0 − 3 1 3 120. [ABSTRACT FROM AUTHOR]

In this paper, we systematically studied half-lives of the different decay modes using various theoretical models such as the unified fission model (UFM) and the effective liquid drop model. Beta-decay half-lives were evaluated using semi-empirical formulae available in the literature. We compared half-lives of all the studied decay modes and identified shorter half-lives among the same in 2 0 5 − 2 3 3 Ac nuclei. We investigated the actinium series which is similar to the thorium series. Among these decay series, alpha-emitting isotopes show great promise for cancer treatment because of their short path length and high-energy transfer of radiation. Furthermore, we predicted the decay chains of the actinium isotopes. All the decay series of actinium ends with the formation of stable nuclei or with longer half-lives. The predicted decay series and new isotopes during the decay process are helpful in the field of medicine and radiotherapy. [ABSTRACT FROM AUTHOR]