Rietveld refinement structure, electric, dielectric and ferroelectric properties of lead-free Ba0.985Sr0.015Zr0.10Ti0.90O3 ceramics

Coulomb-blockade oscillation in CdS, ZnS and CdS/ZnS core-shell quantum dots

“…The absorbance spectra are shifted slightly towards higher wavelengths for CdS/ZnS core-shell samples with increasing volumetric ratios except for sample CZ5. This shift towards higher wavelengths for core-shell samples could be attributed to the increase in particle size due to ZnS shell formation [7]. Thus, exciton formation is expected well inside the core which enhances the luminescence properties.…”

“…The emerging composite materials can be synthesized in the form of ternary, quaternary, or in core/shell type through manipulation of growth parameters. Several workers have already reported a variety of works mainly centering in synthesis of nanocomposites through a compositional variation of cadmium (Cd) and zinc (Zn), structural, optical and electrical characterization and their potential optoelectronic application [7][8][9]. However, there is enough room for more work in development of nano-electronic devices viz; single-electron transistor (SET), MOS capacitor, split gate transistor, MOSFET, memristor etc SET is a sensitive electronic device based on the coulomb blockade effects that has attracted a lot of attention due to its possible applications in nanoelectronics [10,11].SET consists of a small island with a self-capacitance that is weakly coupled to the contacts of the source and drain by tunnel barriers.…”

Impact of rare earth (RE3+ = La3+, Sm3+) substitution in the A site perovskite on the structural, and electrical properties of Ba(Zr0.9Ti0.1)O3 ceramics

“…50 Chandra Das et al reported that for Ba 0.985 Sr 0.015 Zr 0.10 Ti 0.90 O 3 ceramics, the equivalent circuit utilized to describe the electrical properties of the material is composed of two branches in series, which represent the electrical properties of the grain and grain boundary, and the values of R g and R gb decrease with an increase in temperature, which establishes the NTCR nature of the compound BSZT. 51 Ismail et al have demonstrated that the permittivity value varied from 4000 to 19 000 with increasing doping concentration for the different types of RE dopants (Ce, La, Sm, Nd, Er), and indicated that Er-doped BTO exhibited the highest value, i.e., 19 000, for only 1% Er 3+ content. 52 The present work is focused on the rare earths (RE 3+ ¼ La 3+ , Sm 3+ ) substitution in the A site perovskite, for compounds of global composition (Ba 0.9 RE 0.067 )(Zr 0.9 Ti 0.1 ) O 3 (RE 3+ ¼ La 3+ and Sm 3+ ) synthesized by standard solid-state reaction.…”