Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Thermal behaviour of filatovite – a rare aluminoarsenate mineral of the feldspar group. / Горелова, Людмила Александровна; Верещагин, Олег Сергеевич; Бочаров, Владимир Николаевич; Потехина, Надежда; Житова, Е. С.; Пеков, Игорь Викторович.
в: Mineralogical Magazine, Том 88, № 2, 04.2024, стр. 176-184.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Thermal behaviour of filatovite – a rare aluminoarsenate mineral of the feldspar group
AU - Горелова, Людмила Александровна
AU - Верещагин, Олег Сергеевич
AU - Бочаров, Владимир Николаевич
AU - Потехина, Надежда
AU - Житова, Е. С.
AU - Пеков, Игорь Викторович
PY - 2024/4
Y1 - 2024/4
N2 - The high-temperature behaviour of a feldspar group mineral, filatovite (with the simplified formula: K(Al,Zn)2(As,Si)2O8), in which the Al:As:Si ratio is close to 2:1:1, was studied by in situ high-temperature single-crystal X-ray diffraction and in situ high-temperature (hot stage) Raman spectroscopy up to 600 °C. In the temperature range studied (25–600 ºС) filatovite does not undergo any phase transition, whereas at 800 °C it decomposes to X-ray amorphous phase(s). The evolution of twelve main Raman bands was traced during heating, which indicates a gradual change in the crystal structure. The thermal expansion coefficients (TECs) of filatovite demonstrate a sharply anisotropic character of thermal expansion: the maximal expansion is close to the a axis (α11 = 17.7(1) × 106 °C–1), whereas along the b and c axes the TECs are close to zero. Such behavior is typical for the minerals with a similar crystal structure topology; it indicates the dominant role of structure geometry in the thermal behavior of the mineral.
AB - The high-temperature behaviour of a feldspar group mineral, filatovite (with the simplified formula: K(Al,Zn)2(As,Si)2O8), in which the Al:As:Si ratio is close to 2:1:1, was studied by in situ high-temperature single-crystal X-ray diffraction and in situ high-temperature (hot stage) Raman spectroscopy up to 600 °C. In the temperature range studied (25–600 ºС) filatovite does not undergo any phase transition, whereas at 800 °C it decomposes to X-ray amorphous phase(s). The evolution of twelve main Raman bands was traced during heating, which indicates a gradual change in the crystal structure. The thermal expansion coefficients (TECs) of filatovite demonstrate a sharply anisotropic character of thermal expansion: the maximal expansion is close to the a axis (α11 = 17.7(1) × 106 °C–1), whereas along the b and c axes the TECs are close to zero. Such behavior is typical for the minerals with a similar crystal structure topology; it indicates the dominant role of structure geometry in the thermal behavior of the mineral.
KW - filatovite
KW - feldspar
KW - thermal expansion
KW - X-ray diffraction
KW - Raman spectroscopy
UR - https://www.mendeley.com/catalogue/f9a3130a-1942-398f-aeb6-1dbe9244c064/
U2 - 10.1180/mgm.2024.10
DO - 10.1180/mgm.2024.10
M3 - Article
VL - 88
SP - 176
EP - 184
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 2
ER -
ID: 117158703