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Alla Arakcheeva

Publications associées (45)

Fast Lead-Free Humidity Sensor Based on Hybrid Halide Perovskite

László Forró, Dragan Damjanovic, Endre Horvath, Alla Arakcheeva, Márton Kollár, Pavao Roko Andricevic, Trpimir Ivsic

An environmentally friendly analog of the prominent methylammonium lead halide perovskite, methylammonium bismuth bromide (MA3Bi2Br9), was prepared and investigated in the form of powder, single crystals and nanowires. Complete characterization via synchro ...
2022

One-dimensional composite host-guest structure in BaVS3

László Forró, Gervais Chapuis, Alla Arakcheeva, Helmuth Berger, Philip Pattison, Neven Barisic

A detailed synchrotron X-ray diffraction (XRD) study performed with a single crystal of BaVS3 (barium vanadium trisulfide) in the temperature range between 10 and 295 K is reported. Aside from the known tetragonal–orthorhombic (240 K) and orthorhombic–mono ...
2021

Incommensurate crystal structure of PbHfO3

Alla Arakcheeva

Controversy in the description/identification of so-called intermediate phase(s) in PbHfO3, stable in the range similar to 420-480 K, has existed for a few decades. A synchrotron diffraction experiment on a partially detwinned crystal allowed the structure ...
INT UNION CRYSTALLOGRAPHY2020

Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered 1T-TaS2

László Forró, Alla Arakcheeva, Luka Ciric, Helmuth Berger, Philip Johannes Walter Moll, Ana Akrap, Andrea Pisoni, Konstantin Semeniuk

Layered transition metal dichalcogenides (TMDs) are commonly classified as quasi-two-dimensional materials, meaning that their electronic structure closely resembles that of an individual layer, which results in resistivity anisotropies reaching thousands. ...
2020

Effect of Thermal Cycling on the Structural Evolution of Methylammonium Lead Iodide Monitored around the Phase Transition Temperatures

László Forró, Endre Horvath, Alla Arakcheeva, Gaétan Charles Antoine Giriat, Anastasiia Glushkova, Konstantins Mantulnikovs, Konstantin Semeniuk

Optoelectronic devices and solar cells based on organometallic hybrid perovskites have to operate over a broad temperature range, which may contain their structural phase transitions. For instance, the temperature of 330 K, associated with the tetragonal-c ...
WILEY-V C H VERLAG GMBH2019

The influence of the incommensurately modulated structure on the physical properties of Fe1.35Ge

László Forró, Alla Arakcheeva, Helmuth Berger, Philip Pattison, Krunoslav Prsa, Andrea Pisoni, Sergiy Katrych, Jacim Jacimovic

Single crystal growth by chemical vapour transport has resulted samples with Fe1.35Ge stoichiometry. Structural study has shown that the large number of vacancies introduces an incommensuately modulated structure. The electrical resistivity is in the 200 m ...
2019

Pressure-induced transformation of CH3NH3PbI3: the role of the noble-gas pressure transmitting media

László Forró, Endre Horvath, Andrzej Sienkiewicz, Alla Arakcheeva, Gaétan Charles Antoine Giriat, Bálint Náfrádi, Márton Kollár, Anastasiia Glushkova

The photovoltaic perovskite, methylammonium lead triiodide [CH3NH3PbI3 (MAPbI(3))], is one of the most efficient materials for solar energy conversion. Various kinds of chemical and physical modifications have been applied to MAPbI(3) towards better unders ...
International Union of Crystallography (IUCr)2019

Sr2Pt8−x As: a layered incommensurately modulated metal with saturated resistivity

László Forró, Oleg Yazyev, Alla Arakcheeva, Philip Johannes Walter Moll, Gabriel Albert Autes, Andrea Pisoni, Sergiy Katrych, Maja Deborah Bachmann, Edoardo Martino

The high-pressure synthesis and incommensurately modulated structure are reported for the new compound Sr2Pt8-xAs, with x = 0.715 (5). The structure consists of Sr2Pt3 As layers alternating with Pt-only corrugated grids. Ab initio calculations predict a me ...
2018

Cyan titania nanowires: Spectroscopic study of the origin of the self-doping enhanced photocatalytic activity

László Forró, Arnaud Magrez, Endre Horvath, Alla Arakcheeva, Richard Gaal, Bálint Náfrádi, Massimo Spina, Jacim Jacimovic, Péter Szirmai, Laurent Syavoch Bernard, Xavier Berdat

We report a detailed spectroscopic study of Ti3+ self-doped TiO2 nanowires prepared by high temperature annealing of the protonated titanate nanowires (TiONW) in hydrogen atmosphere. Hydrogenation causes a color change from white to cyan and a major increa ...
Elsevier2017

Incommensurate atomic density waves in the high-pressure IVb phase of barium

Gervais Chapuis, Alla Arakcheeva, Philip Pattison, Vladimir Dmitriev

The host–guest structures of elements at high pressure discovered a decade ago still leave many open questions due to the lack of precise models based on full exploitation of the diffraction data. This concerns in particular Ba IV, which is stable in the r ...
Int Union Crystallography2017

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