Publications by authors named "R Kevorkyants"

This work reports on hybrid hexamethylenediaminium lead halide perovskites. The materials were prepared using wet synthesis and the subsequent precipitation from aqueous solution. Structural and morphological charactarization studies show their high degree of crystallinity and phase purity.

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In this study, we explored both the crystal and electronic structures of new synthesized materials 3-NH-PyPbX (X = Br, I). Both compounds are isostructural, and they crystallize in the monoclinic space group 2/, with four formula units in the unit cell. According to the analysis of their electronic structures, both compounds are direct semiconductors with direct transitions between valence and conduction bands occurring at the -points A, Z, and at about half of the distance between the -points D/D1 and D1/E.

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MXenes are of great practical interest. While the physical properties of such a well-known MAX phase as TiAlC and the TiC MXene that is based on it have been widely studied, it is extremely important to study the properties of new four-component MAX-phases and the MXenes based on them. To do this, first, it is necessary to characterize the obtained materials.

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This article revisits the properties of BaBiO examined extensively in the last two decades because of its electronic properties as a superconductor and as a semiconductor photocatalyst. Solid-state syntheses of this bismuthate have often involved BaCO as the barium source, which may lead to the formation of BaBiO/BaCO heterostructures that could have an impact on the electronic properties and, more importantly, on the photocatalytic activity of this bismuthate. Accordingly, we synthesized BaBiO by a solid-state route to avoid the use of a carbonate; it was characterized by XRD, SEM, and EDX, while elemental mapping characterized the composition and the morphology of the crystalline BaBiO and its thin films with respect to structure, optoelectronic, and photocatalytic properties.

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We report on the structure and properties of novel SrBiO/SrCO and SrBiO/SrCO heterostructures with SrCO content varying from 10 wt% to 90 wt%. Formation of the heterostructures is succeeded via sintering technique and according to XRD, SEM, and EDX studies has resulted in highly crystalline materials with well-defined carbonate-bismuthate interfaces. In the reaction of photodegradation of phenol in aqueous solution the heterostructures demonstrated photocatalytic activity exceeding that of TiO.

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