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  1. Article: Self-flux-grown Ba

    Arakcheeva, Alla / Bi, Wen Hua / Baral, Priya Ranjan / Magrez, Arnaud

    CrystEngComm

    2022  Volume 24, Issue 19, Page(s) 3529–3536

    Abstract: The synthesis and X-ray structural study of the new family of compounds ... ...

    Abstract The synthesis and X-ray structural study of the new family of compounds Ba
    Language English
    Publishing date 2022-04-21
    Publishing country England
    Document type Journal Article
    ISSN 1466-8033
    ISSN 1466-8033
    DOI 10.1039/d1ce01657a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: High-Pressure Synthesis of Rare-Earth Borate-Nitrate Crystals for Second Harmonic Generation.

    Katrych, Sergiy / Arakcheeva, Alla / Sienkiewicz, Andrzej / Forró, László / Ivšić, Trpimir

    Inorganic chemistry

    2020  Volume 60, Issue 1, Page(s) 286–291

    Abstract: The crystals of a novel family of rare-earth borate-nitrate compounds, ...

    Abstract The crystals of a novel family of rare-earth borate-nitrate compounds,
    Language English
    Publishing date 2020-12-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/acs.inorgchem.0c02909
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Incommensurate crystal structure of PbHfO

    Bosak, Alexei / Svitlyk, Volodymyr / Arakcheeva, Alla / Burkovsky, Roman / Diadkin, Vadim / Roleder, Krystian / Chernyshov, Dmitry

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2020  Volume 76, Issue Pt 1, Page(s) 7–12

    Abstract: Controversy in the description/identification of so-called intermediate phase(s) in ... ...

    Abstract Controversy in the description/identification of so-called intermediate phase(s) in PbHfO
    Keywords covid19
    Language English
    Publishing date 2020-02-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 1600-8650 ; 2052-5192
    ISSN (online) 2052-5206 ; 1600-5740 ; 1600-8650
    ISSN 2052-5192
    DOI 10.1107/S205252061901494X
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-ray Photodetector.

    Glushkova, Anastasiia / Andričević, Pavao / Smajda, Rita / Náfrádi, Bálint / Kollár, Márton / Djokić, Veljko / Arakcheeva, Alla / Forró, László / Pugin, Raphael / Horváth, Endre

    ACS nano

    2021  Volume 15, Issue 3, Page(s) 4077–4084

    Abstract: X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low-photon flux, therefore stimulating the search for ... ...

    Abstract X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low-photon flux, therefore stimulating the search for novel materials and new approaches. Recently, hybrid halide perovskite CH
    Language English
    Publishing date 2021-02-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.0c07993
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: CH

    Arakcheeva, Alla / Chernyshov, Dmitry / Spina, Massimo / Forró, László / Horváth, Endre

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2016  Volume 72, Issue Pt 5, Page(s) 716–722

    Abstract: The crystal structure of the pristine (I) and aged (II) crystals of ... ...

    Abstract The crystal structure of the pristine (I) and aged (II) crystals of CH
    Language English
    Publishing date 2016-10-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 2052-5192 ; 0108-7681
    ISSN (online) 2052-5206 ; 1600-5740
    ISSN 2052-5192 ; 0108-7681
    DOI 10.1107/S2052520616010428
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Incommensurate crystal structure of PbHfO3

    Bosak, Alexei / Svitlyk, Volodymyr / Arakcheeva, Alla / Burkovsky, Roman / Diadkin, Vadim / Roleder, Krystian / Chernyshov, Dmitry

    Acta Crystallogr B Struct Sci Cryst Eng Mater

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

    Abstract Controversy in the description/identification of so-called intermediate phase(s) in PbHfO3, stable in the range ∼420-480†K, has existed for a few decades. A synchrotron diffraction experiment on a partially detwinned crystal allowed the structure to be solved in the superspace group Imma(00γ)s00 (No. 74.2). In contrast to some previously published reports, in the pure compound only one distinct phase was observed between Pbam PbZrO3-like antiferroelectric and Pm3m paraelectric phases. The modulation vector depends only slightly on temperature. The major structure modulation is associated with the displacement of lead ions, which is accompanied by a smaller amplitude modulation for the surrounding O atoms and tilting of HfO6 octahedra. Tilting of the octahedra results in a doubling of the unit cell compared with the parent structure.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #32831234
    Database COVID19

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  7. Book ; Online: Influence of the organic cation disorder on photoconductivity in ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4

    Glushkova, Anastasiia / Arakcheeva, Alla / Pattison, Philip / Kollár, Márton / Andričević, Pavao / Náfrádi, Bálint / Forró, László / Horváth, Endre

    2021  

    Abstract: We report the synthesis and crystal structure of an organic inorganic compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron based single crystal X-ray diffraction experiments revealed that the pristine and thermally treated crystals ... ...

    Abstract We report the synthesis and crystal structure of an organic inorganic compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron based single crystal X-ray diffraction experiments revealed that the pristine and thermally treated crystals differ in the organic cation behaviour, which is characterized by a partial disorder in the thermally treated crystal. Based on current voltage measurements, increased disorder of the organic cation is associated with enhanced photoconductivity. This compound could be a potential candidate for interface engineering in lead halide perovskite-based optoelectronic devices.

    Comment: 11 pages, 6 figures, 2 tables
    Keywords Condensed Matter - Materials Science
    Publishing date 2021-04-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Incommensurate atomic density waves in the high-pressure IVb phase of barium.

    Arakcheeva, Alla / Bykov, Maxim / Bykova, Elena / Dubrovinsky, Leonid / Pattison, Phil / Dmitriev, Vladimir / Chapuis, Gervais

    IUCrJ

    2017  Volume 4, Issue Pt 2, Page(s) 152–157

    Abstract: 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 ...

    Abstract 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 range 12-45 GPa. With the example of phase Ba IVb, which is characterized here for the first time, a systematic analysis is presented of possible host-guest structure models based on high-quality single-crystal diffraction data obtained with synchrotron radiation at six different pressures between 16.5 and 19.6 GPa. It is shown that a new incommensurately modulated (IM) structure model better fits the experimental data. Unlike the composite models which are commonly reported for the Ba IV phases, the IM model reveals a density wave and its pressure-dependent evolution. The crucial role played by the selected model in the interpretation of structure evolution under pressure is discussed. The findings give a new experimental basis for a better understanding of the nature of host-guest structures.
    Language English
    Publishing date 2017-01-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2754953-7
    ISSN 2052-2525
    ISSN 2052-2525
    DOI 10.1107/S2052252517000264
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Book ; Online: Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-Ray Photodetector

    Glushkova, Anastasiia / Andričević, Pavao / Smajda, Rita / Náfrádi, Bálint / Kollár, Márton / Djokić, Veljko / Arakcheeva, Alla / Forró, László / Pugin, Raphael / Horváth, Endre

    2021  

    Abstract: X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low photon flux, therefore stimulating the search for ... ...

    Abstract X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low photon flux, therefore stimulating the search for novel materials and new approaches. Recently, hybrid halide perovskite CH3NH3PbI3 (MAPbI3) has attracted considerable attention due to its advantageous optoelectronic properties and low fabrication costs. The presence of heavy atoms, providing a high scattering cross-section for photons, makes this material a perfect candidate for X-ray detection. Despite the already-successful demonstrations of efficiency in detection, its integration into standard microelectronics fabrication processes is still pending. Here, we demonstrate a promising method for building X-ray detector units by 3D aerosol jet printing with a record sensitivity of 2.2 x 108 {\mu}C Gyair-1cm-2 when detecting 8 keV photons at dose-rates below 1 Gy/s (detection limit 0.12 Gy/s), a four-fold improvement on the best-in-class devices. An introduction of MAPbI3-based detection into medical imaging would significantly reduce health hazards related to the strongly ionizing X-rays photons.

    Comment: 25 pages, 4 figures
    Keywords Condensed Matter - Materials Science
    Publishing date 2021-05-01
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: 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.

    Arakcheeva, Alla / Chapuis, Gervais

    Acta crystallographica. Section B, Structural science

    2008  Volume 64, Issue Pt 1, Page(s) 12–25

    Abstract: The previously reported incommensurately modulated scheelite-like structure KNd(MoO(4))(2) has been exploited as a natural (3 + 1)-dimensional superspace model to generate the scheelite-like three-dimensional structure family. Although each member ... ...

    Abstract The previously reported incommensurately modulated scheelite-like structure KNd(MoO(4))(2) has been exploited as a natural (3 + 1)-dimensional superspace model to generate the scheelite-like three-dimensional structure family. Although each member differs in its space-group symmetry, unit-cell parameters and compositions, in (3 + 1)-dimensional space, they share a common superspace group, a common number of building units in the basic unit cell occupying Wyckoff sites with specific coordinates (x, y, z) and specific basic unit-cell axial ratios (c/a, a/b, b/c) and angles. Variations of the modulation vector q, occupation functions and t(0) are exploited for the derivation. Eight topologically and compositionally different known structures are compared with their models derived from the KNd(MoO(4))(2) structure in order to evaluate the capabilities and limitations of the incommensurately modulated structure to act as a superspace generating model. Applications of the KNd(MoO(4))(2) structure as a starting model for the refinement and prediction of some other modulated members of the family is also illustrated. The (3 + 1)-dimensional presentation of the scheelite-like structures reveals new structural relations, which remain hidden if only conventional three-dimensional structure descriptions are applied.
    Language English
    Publishing date 2008-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 0108-7681 ; 2052-5192
    ISSN (online) 2052-5206 ; 1600-5740
    ISSN 0108-7681 ; 2052-5192
    DOI 10.1107/S010876810705923X
    Database MEDical Literature Analysis and Retrieval System OnLINE

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