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Chumakova NA, Popov DS, Kaplin AV, Rebrikova AT, Eremina EA, Korobov MV, Khrykina ON. Phase transformation in the "Brodie graphite oxide-acetonitrile" system - influence of the oxidizing level of the material. Phys Chem Chem Phys 2023; 25:9648-9655. [PMID: 36943208 DOI: 10.1039/d3cp00426k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Reversible phase transformation in the Brodie graphite oxide-acetonitrile system, which is intercalation or release of part of the sorbed liquid from the interplanar space accompanied by an increase or a decrease in interplanar distances, is commonly observed in twice-oxidized materials. We observed this phenomenon for once-, twice- and thrice-oxidized materials using the EPR spin probe technique, DSC, and temperature programmed XRD. It was shown that all materials under study formed similar low temperature (LT) and high temperature (HT) swollen structures with acetonitrile. The phase transformation of these structures is observed for materials with different oxidation levels in the same temperature range (∼20 K). The twice- and thrice-oxidized Brodie graphite oxides form swollen structures with the same parameters, while the once-oxidized material sorbs less acetonitrile at lower temperatures, but shows the same interplanar distances as those in twice- and thrice-oxidized materials. The spin probe technique has proven its sensitivity to the appearance of small amounts of the new forming swollen structures, which makes this method useful in studies of phase transformations.
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Affiliation(s)
- N A Chumakova
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow, 119991, Russia.
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - D S Popov
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - A V Kaplin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow, 119991, Russia.
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - A T Rebrikova
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - E A Eremina
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - M V Korobov
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - O N Khrykina
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 59 Leninskiy prospect, Moscow, 119333, Russia
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Dudka AP, Khrykina ON, Bolotina NB, Shitsevalova NY. Jahn–Teller Lattice Distortions and Asymmetric Electron Density Distribution in the Structure of TmB12 Dodecaboride in the Temperature Range of 85–293 K. CRYSTALLOGR REP+ 2019. [DOI: 10.1134/s1063774519050079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Dudka AP, Bolotina NB, Khrykina ON. DebyeFit: a simple tool to obtain an appropriate model of atomic vibrations in solids from atomic displacement parameters obtained at different temperatures. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719005818] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
DebyeFit is a simple tool to calculate the Debye or Einstein characteristic temperature of thermal vibrations in crystals from the equivalent atomic displacement parameters (ADPs) of any atom obtained at several temperatures. The ADP values are separated into static and dynamic components to get a best fit to the Debye, Einstein or mixed model. The static term is added to account for possible static disorder. A nonlinear least-squares technique is used to refine the parameters of the model for sets of ADPs observed in multi-temperature structural studies. The program provides a good fit between theoretical and observed ADP values.
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Sluchanko NE, Azarevich AN, Bogach AV, Bolotina NB, Glushkov VV, Demishev SV, Dudka AP, Khrykina ON, Filipov VB, Shitsevalova NY, Komandin GA, Muratov AV, Aleshchenko YA, Zhukova ES, Gorshunov BP. Observation of dynamic charge stripes in Tm 0.19Yb 0.81B 12 at the metal-insulator transition. J Phys Condens Matter 2019; 31:065604. [PMID: 30524111 DOI: 10.1088/1361-648x/aaf44e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Accurate low temperature charge transport measurements in combination with high-precision x-ray diffraction experiments have allowed detection of the symmetry lowering in the single domain Tm0.19Yb0.81B12 crystals that belong to the family of dodecaborides with metal-insulator transition. Based on the fine structure analysis we discover the formation of dynamic charge stripes within the semiconducting matrix of Tm0.19Yb0.81B12. The charge dynamics in these conducting nano-size channels is characterized by broad-band optical spectroscopy that allowed estimating the frequency (~2.4 × 1011 Hz) of quantum motion of the charge carriers. It is suggested that cooperative Jahn-Teller effect in the boron sublattice is a cause of the large-amplitude rattling modes of the Tm and Yb ions responsible for the 'modulation' of the conduction band along one of the [Formula: see text] directions through the variation of 5d-2p hybridization of electron states.
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Affiliation(s)
- N E Sluchanko
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, Moscow 119991, Russia. Moscow Institute of Physics and Technology, 9, Institutskii per., Dolgoprudnyi, Moscow region 141700, Russia
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Chernaya TS, Verin IA, Khrykina ON, Bolotina NB. Defect Structures of La1 – ySr
y
F3 – y, La1 – yBa
y
F3 – y, and Nd1 – yCa
y
F3 – y (y = 0.05, 0.10) Nonstoichiometric Tysonite Phases. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518010042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Khrykina ON, Sorokin NI, Verin IA, Bolotina NB, Sobolev BP. Defect structure and ionic conductivity of as-grown R
1–y
Sr
y
F3–y
(R = Ce, Pr, or Nd) crystals with high SrF2 content. CRYSTALLOGR REP+ 2017. [DOI: 10.1134/s1063774517040083] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bolotina NB, Chernaya TS, Verin IA, Khrykina ON, Sobolev BP. Dimorphism of RF3 (R = La–Nd) crystals based on the data of X-ray diffraction studies. CRYSTALLOGR REP+ 2016. [DOI: 10.1134/s1063774516010041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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