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Alla Arakcheeva

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Publications associées (43)

Possibility of an unconventional spin state of Ir4+ in Ba21Ir9O43 single crystal

László Forró, Arnaud Magrez, Oleg Yazyev, Alla Arakcheeva, Bálint Náfrádi, Henrik Moodysson Rønnow, Ivica Zivkovic, Jacim Jacimovic, Sergiy Katrych, Andrea Pisoni, Lin Yang, Noore Elahi Shaik

We report the synthesis of single crystals of a novel layered iridate Ba21Ir9O43 and present the crystallographic, transport, and magnetic properties of this material. The compound has a hexagonal structure with two iridium oxide layers stacked along the c ...

Amer Physical Soc2016

Optically switched magnetism in photovoltaic perovskite CH3NH3(Mn:Pb)I-3

László Forró, Oleg Yazyev, Alla Arakcheeva, Bálint Náfrádi, Massimo Spina, Endre Horvath, Péter Szirmai

The demand for ever-increasing density of information storage and speed of manipulation boosts an intense search for new magnetic materials and novel ways of controlling the magnetic bit. Here, we report the synthesis of a ferromagnetic photovoltaic CH3NH3 ...

Nature Publishing Group2016

Organic-inorganic hybrid perovskite CH3NH3PbI3: structural consequences of water absorption

László Forró, Alla Arakcheeva, Massimo Spina, Endre Horvath

IUCr/Wiley2016

CH3NH3PbI3: precise structural consequences of water absorption at ambient conditions

László Forró, Alla Arakcheeva, Massimo Spina, Endre Horvath

The crystal structure of the pristine (I) and aged (II) crystals of CH3NH3PbI3 (hereafter MAPbI(3)) hybrid organic-inorganic lead iodide has been studied at 293 K with high-precision single-crystal X-ray diffraction using a synchrotron light source. We sho ...

Int Union Crystallography2016

Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

László Forró, Arnaud Magrez, Alla Arakcheeva, Bastien Dalla Piazza, Ana Akrap, Krunoslav Prsa, Henrik Moodysson Rønnow, Jacim Jacimovic, Sergiy Katrych, Andrea Pisoni, Lin Yang

The novel iridate Ba8Al2IrO14 was prepared as single crystals by self-flux method, thereby providing a rare example of an all-Ir(VI) compound that can be synthesized under ambient pressure conditions. The preparation of all-Ir6+ iridate without using tradi ...

2015

KEu(MoO4)(2): Polymorphism, Structures, and Luminescent Properties

Alla Arakcheeva, Philip Pattison

In this paper, with the example of two different polymorphs of KEu(MoO4)(2), the influence of the ordering of the A-cations on the luminescent properties in scheelite related compounds (A',A '') (B',B '')O-4 is investigated. The polymorphs were synthe ...

American Chemical Society2015

Synthesis, growth and characterization of 4-bromo-4′-nitrobenzylidene aniline (BNBA): a novel nonlinear optical material with a (3+1)-dimensional incommensurately modulated structure

Gervais Chapuis, Alla Arakcheeva, Philip Pattison

The organic nonlinear optical material of 4-bromo-4'-nitrobenzylidene aniline (BNBA, C13H9BrN2O2), a new derivative of benzylideneaniline family, was synthesized and purified by repeated recrystallization. Single crystals of BNBA were grown in acetone solv ...

Royal Society of Chemistry2013

Na2/7Gd4/7MoO4: a Modulated Scheelite-Type Structure and Conductivity Properties

Alla Arakcheeva

Scheelite-type compounds with the general formula (A1,A2)(n)(B1,B2)O-4 (2/3

2012

The luminescence of NaxEu3+(2−x)/3MoO4 scheelites depends on the number of Eu-clusters occurring in their incommensurately modulated structure

Jean-Claude Bünzli, Gervais Chapuis, Alla Arakcheeva, Philip Pattison, Dmitry Logvinovich, Svetlana Eliseeva

Scheelite related compounds with general formula Mn(XO4)m are of interest owing to their optical properties, stability and relatively simple preparation. Eu3+-containing scheelites are considered as red emitting phosphors and the main factors affecting the ...

2012

Crystal Structure and Optical and Magnetic Properties of Pr2(MoO4)3

Gervais Chapuis, Alla Arakcheeva, Philip Pattison, Dmitry Logvinovich

Praseodymium molybdate Pr2(MoO4)3 was synthesized using the standard ceramic route. The crystal structure of the material has been successfully solved in superspace group I2/b(Rβ0)00 with lattice constants a = 5.30284(4), b = 5.32699(3), c = 11.7935(1)A° , ...

2010

LiZnNb4O11.5: A novel oxygen deficient compound in the Nb-rich part of the Li2O–ZnO–Nb2O5 system

Gervais Chapuis, Alla Arakcheeva, Philip Pattison

A novel lithium zinc niobium oxide LiZnNb4O11.5 (LZNO) has been found in the Nb-rich part of Li2O–ZnO–Nb2O5 system. LZNO, with an original a-PbO2 related structure, has been synthesized by the routine ceramic technique and characterized by X-ray diffractio ...

2010

The role of silver on the stabilization of the incommensurately modulated structure in calaverite, AuTe2

Gervais Chapuis, Alla Arakcheeva

Structural investigations of several minerals belonging to the calaverite group with composition Au1–xAgxTe2 (x = 0.00, 0.02, 0.05, 0.09, 0.19, and 0.33) indicate that Ag is randomly distributed on the Au sites. This suppresses the valence fluctuation of A ...

Mineralogical Society of America2009

Validating the model of a (3+1)-dimensional incommensurately modulated structure as generator of a family of compounds for the Eu2(MoO4)3 scheelite structure

Gervais Chapuis, Alla Arakcheeva, Philip Pattison, Jorge Martinez Garcia

The previously proposed model postulating that the incommensurately modulated KNd(MoO

_4

)

_2

structure can act as a generator of the scheelite family members is validated here by refining the crystal structure of europium molybdate, Eu

_2

(MoO

_4

)

_3

. ...

2009

Capabilities and limitations of a (3 + d )-dimensional incommensurately modulated structure as a model for the derivation of an extended family of compounds: example of the scheelite-like structures

Gervais Chapuis, Alla Arakcheeva

2008

KSm(MoO4)2, an incommensurately modulated and partially disordered scheelite-like structure

Gervais Chapuis, Alla Arakcheeva, Philip Pattison

The incommensurately modulated scheelite-like KSm(MoO4)2 structure has been refined in the monoclinic superspace group I2/b(ab0)00 by the Rietveld method on the basis of synchrotron radiation powder diffraction data. The systematic broadening of satellite ...

2008

Hexagonal ferrites: a unifiedmodel of the (TS)nT series in superspace

Gervais Chapuis, Ivan Orlov, Alla Arakcheeva

2007

New insight into the pectolite – serandite series: a single crystal diffraction study of Na(Ca1.73Mn0.27)[HSi3O9] at 293 and 100 K

Gervais Chapuis, Alla Arakcheeva, Philip Pattison

2007

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Alla Arakcheeva

This work was accomplished in the context of systematic examination of a role played by electrolyte cation composition in electroreduction processes. The electrochemical behaviour of molten salts systems where CsCl was used as solvent for potassium and cae ...

2006

KNd(MoO4)2: A New Incommensurate Modulated Structure in the Scheelite Family

Gervais Chapuis, Alla Arakcheeva

2006

Getting more out of an incommensurately modulated structure: the example of K_5Yb(MoO_4)_4

Gervais Chapuis, Alla Arakcheeva

A method based on the superspace approach is presented with the aim of generating a family of modular structures from a single incommensurately modulated structure. This approach based on the variation of the modulation vector q is applied to the generatio ...

2006

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