| Форма представления | Статьи в зарубежных журналах и сборниках |
| Год публикации | 2020 |
| Язык | английский |
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Вагизов Фарит Габдулхакович, автор
Зиннатуллин Алмаз Линарович, автор
|
|
Biryukov Y. P., автор
Bubnova Rimma , автор
Filatov, Stanislav K., автор
Pekov Igor V., автор
Shablinskii, Andrey P., автор
Shilovskikh Vladimir V., автор
|
| Библиографическое описание на языке оригинала |
Biryukov Y.P. Investigation of thermal behavior of mixed-valent iron borates vonsenite and hulsite containing [OM4]n+ and [OM5]n+ oxocentred polyhedra by in situ high-temperature Mossbauer spectroscopy, X-ray diffraction and thermal analysis Mixed-valent iron borates vonsenite and hulsite / Y.P. Biryukov, A.L. Zinnatullin, R.S. Bubnova, F.G. Vagizov, A.P. Shablinskii, S.K. Filatov, V.V. Shilovskikh, I.V. Pekov // Acta Cryst. B. – 2020. – Vol. 76. - p.1-11 |
| Аннотация |
The investigation of elemental composition, crystal structure and thermal behavior of vonsenite and hulsite from the Titovskoe boron deposit in Russia is reported. The structures of the borates are described in terms of cation-centered and oxocentred polyhedra. There are different sequences of double chains and layers consisting of oxocentred [ОM4]^n+ tetrahedra and [OM4]^n+ tetragonal pyramids forming a framework. Elemental composition was determined by energy-dispersive X-ray spectroscopy (EDX). Oxidation states and coordina?tion sites of iron and tin in the oxoborates are determined using Mossbauer spectroscopy and compared with EDX and X-ray diffraction data (XRD). According to results obtained from high-temperature Mossbauer spectroscopy, the Fe2+ to Fe3+ oxidation in vonsenite and hulsite occurs at approximately 500 and 600 K, respectively. According to the high -temperature XRD data, this process is accompanied by an assumed deformation of crystal structures and subsequent solid-phase decomposition to hematite and warwickite. It is seen as a monotonic decrease of volume thermal expansion coefficients with an increase in temperature. A partial magnetic ordering in hulsite is observed for the first time with Tc ~ 383 K. Near this temperature, an unusual change of thermal expansion coefficients is revealed. Vonsenite starts to melt at 1571 К and hulsite starts to melt at 1504 K. Eigenvalues of thermal expansion tensor are calculated for the oxoborates as well as the tensor of anisotropy of the expansion is described in comparison with their crystal structures. |
| Ключевые слова |
oxoborate; oxidation, high-temperature Mossbauer spectroscopy, high-temperature X-ray diffraction, thermal expansion |
| Название журнала |
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
|
| Ссылка для РПД |
http://dspace.kpfu.ru/xmlui/bitstream/handle/net/158963/Acta_Cryst_B76_2020__Vagizov.pdf?sequence=1&isAllowed=y
|
| Пожалуйста, используйте этот идентификатор, чтобы цитировать или ссылаться на эту карточку |
https://repository.kpfu.ru/?p_id=234595 |
| Файлы ресурса | |
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Полная запись метаданных  |
| Поле DC |
Значение |
Язык |
| dc.contributor.author |
Вагизов Фарит Габдулхакович |
ru_RU |
| dc.contributor.author |
Зиннатуллин Алмаз Линарович |
ru_RU |
| dc.contributor.author |
Biryukov Y. P. |
ru_RU |
| dc.contributor.author |
Bubnova Rimma |
ru_RU |
| dc.contributor.author |
Filatov, Stanislav K. |
ru_RU |
| dc.contributor.author |
Pekov Igor V. |
ru_RU |
| dc.contributor.author |
Shablinskii, Andrey P. |
ru_RU |
| dc.contributor.author |
Shilovskikh Vladimir V. |
ru_RU |
| dc.date.accessioned |
2020-01-01T00:00:00Z |
ru_RU |
| dc.date.available |
2020-01-01T00:00:00Z |
ru_RU |
| dc.date.issued |
2020 |
ru_RU |
| dc.identifier.citation |
Biryukov Y.P. Investigation of thermal behavior of mixed-valent iron borates vonsenite and hulsite containing [OM4]n+ and [OM5]n+ oxocentred polyhedra by in situ high-temperature Mossbauer spectroscopy, X-ray diffraction and thermal analysis Mixed-valent iron borates vonsenite and hulsite / Y.P. Biryukov, A.L. Zinnatullin, R.S. Bubnova, F.G. Vagizov, A.P. Shablinskii, S.K. Filatov, V.V. Shilovskikh, I.V. Pekov // Acta Cryst. B. – 2020. – Vol. 76. - p.1-11 |
ru_RU |
| dc.identifier.uri |
https://repository.kpfu.ru/?p_id=234595 |
ru_RU |
| dc.description.abstract |
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials |
ru_RU |
| dc.description.abstract |
The investigation of elemental composition, crystal structure and thermal behavior of vonsenite and hulsite from the Titovskoe boron deposit in Russia is reported. The structures of the borates are described in terms of cation-centered and oxocentred polyhedra. There are different sequences of double chains and layers consisting of oxocentred [ОM4]^n+ tetrahedra and [OM4]^n+ tetragonal pyramids forming a framework. Elemental composition was determined by energy-dispersive X-ray spectroscopy (EDX). Oxidation states and coordina?tion sites of iron and tin in the oxoborates are determined using Mossbauer spectroscopy and compared with EDX and X-ray diffraction data (XRD). According to results obtained from high-temperature Mossbauer spectroscopy, the Fe2+ to Fe3+ oxidation in vonsenite and hulsite occurs at approximately 500 and 600 K, respectively. According to the high -temperature XRD data, this process is accompanied by an assumed deformation of crystal structures and subsequent solid-phase decomposition to hematite and warwickite. It is seen as a monotonic decrease of volume thermal expansion coefficients with an increase in temperature. A partial magnetic ordering in hulsite is observed for the first time with Tc ~ 383 K. Near this temperature, an unusual change of thermal expansion coefficients is revealed. Vonsenite starts to melt at 1571 К and hulsite starts to melt at 1504 K. Eigenvalues of thermal expansion tensor are calculated for the oxoborates as well as the tensor of anisotropy of the expansion is described in comparison with their crystal structures. |
ru_RU |
| dc.language.iso |
ru |
ru_RU |
| dc.subject |
oxoborate; oxidation |
ru_RU |
| dc.subject |
high-temperature Mossbauer spectroscopy |
ru_RU |
| dc.subject |
high-temperature X-ray diffraction |
ru_RU |
| dc.subject |
thermal expansion |
ru_RU |
| dc.title |
Investigation of thermal behavior of mixed-valent iron borates vonsenite and hulsite containing [OM4]n+ and [OM5]n+ oxocentred polyhedra by in situ high-temperature Mossbauer spectroscopy, X-ray diffraction and thermal analysis Mixed-valent iron borates vonsenite and hulsite |
ru_RU |
| dc.type |
Статьи в зарубежных журналах и сборниках |
ru_RU |
|
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