KFU. Card publication. 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

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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

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Vagizov Farit Gabdulkhakovich, author

Zinnatullin Almaz Linarovich, author

Other authors

Biryukov Y. P., author

Bubnova Rimma , author

Filatov, Stanislav K., author

Pekov Igor V., author

Shablinskii, Andrey P., author

Shilovskikh Vladimir V., author

Bibliographic description in the original language

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

Annotation

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 [�M4]^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 � 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.

Keywords

oxoborate; oxidation, high-temperature Mossbauer spectroscopy, high-temperature X-ray diffraction, thermal expansion

The name of the journal

Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials

On-line resource for training course

http://dspace.kpfu.ru/xmlui/bitstream/handle/net/158963/Acta_Cryst_B76_2020__Vagizov.pdf?sequence=1&isAllowed=y

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=234595&p_lang=2

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Full metadata record

Field DC	Value	Language
dc.contributor.author	Vagizov Farit Gabdulkhakovich	ru_RU
dc.contributor.author	Zinnatullin Almaz Linarovich	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/eng/?p_id=234595&p_lang=2	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 [�M4]^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 � 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	Articles in international journals and collections	ru_RU