Structural Refinement and Optoelectrical Properties of NdRuO and GdRuO Pyrochlore Oxides for Photovoltaic Applications.

High-performance photovoltaic devices require active photoanodes with superior optoelectric properties. In this study, we synthesized neodymium ruthenate, NdRuO (NRO), and gadolinium ruthenate pyrochlore oxides, GdRuO (GRO), via the solid-state reaction technique, showcasing their potential as promising candidates for photoanode absorbers to enhance the efficiency of dye-sensitized solar cells. A structural analysis revealed predominantly cubic symmetry phases for both materials within the - space group, along with residual orthorhombic symmetry phases (NdRuO and GdRuO, respectively) refined in the space group.

Large Electrocaloric Responsivity and Energy Storage Response in the Lead-Free Ba(GeTi)O Ceramics.

Ferroelectric property that induces electrocaloric effect was investigated in Ba(GeTi)O ceramics, known as BTGx. X-ray diffraction analysis shows pure perovskite phases in tetragonal symmetry compatible with the 4 (No. 99) space group.

Investigation of Polyol Process for the Synthesis of Highly Pure BiFeO Ovoid-Like Shape Nanostructured Powders.

Exclusive and unprecedented interest was accorded in this paper to the synthesis of BiFeO nanopowders by the polyol process. The synthesis protocol was explored and adjusted to control the purity and the grain size of the final product. The optimum parameters were carefully established and an average crystallite size of about 40 nm was obtained.

Repolarization of Ferroelectric Superlattices BaZrO/BaTiO.

With the use of the modified Sawyer-Tower scheme and Merz technique, studies were conducted on the repolarization characteristics of ferroelectric (BaZrO/BaTiO) superlattices on monocrystalline MgO substrate. Studies of temperature changes in the dielectric hysteresis loops indicated a sufficiently smooth decrease in spontaneous polarization compared with homogeneous barium titanate near the phase transition temperature of the superlattice. Experimental studies of switched currents have shown that the switching processes in the synthesized superlattices are implemented in two stages: activation motion ("creep" mode) and non-activation motion (slip mode).

Structural, Dielectric, and Magnetic Properties of Multiferroic ( 1 - x ) LaCaMnO-( x ) BaTiSnO Laminated Composites.

High-performance lead-free multiferroic composites are desired to replace the lead-based ceramics in multifunctional device applications. Laminated compounds were prepared from ferroelectric and ferromagnetic materials. In this work, we present the laminated ceramics compound by considering the ferromagnetic LaCaMnO (LCMO) and the ferroelectric BaTiSnO (BTSO) in two different proportions.

Dielectric Properties and Switching Processes of Barium Titanate⁻Barium Zirconate Ferroelectric Superlattices.

This article is devoted to the investigation of the dielectric and repolarization properties of barium zirconate and barium titanate BaZrO₃/BaTiO₃ superlattices with a period of 13.322 nm on a monocrystal magnesium oxide (MgO) substrate. Synthesized superlattices demonstrated a ferroelectric phase transition at a temperature of approximately 393 °C, which is far higher than the Curie temperature of BaTiO₃ thin films and bulk samples.

Ferrielectricity in smectic-C^{*} dechiralization-line lattices.

Recent experiments probing a new ferroelectric liquid crystal (CLF08) confined in cells with planar alignment have shown dielectric and optic anomalies suggesting the onset of ferrielectric ordering within the surface lattice of dechiralization lines. We present a phenomenological theory describing the corresponding phase transition sequence SmA→SmC^{*}→Ferri. Phase diagrams and thermodynamic, dielectric, and optic properties are worked out and compared with experiments.