Research output: Contribution to journal › Article › peer-review
Thermal Expansion and Polymorphism of Slawsonite SrAl2Si2O8. / Gorelova, Liudmila ; Vereshchagin, Oleg ; Kasatkin, Anatoly .
In: Minerals, Vol. 11, No. 10, 1150, 18.10.2021.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Thermal Expansion and Polymorphism of Slawsonite SrAl2Si2O8
AU - Gorelova, Liudmila
AU - Vereshchagin, Oleg
AU - Kasatkin, Anatoly
N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/10/18
Y1 - 2021/10/18
N2 - Slawsonite’s (SrAl2Si2O8) structure evolutions depending on temperature (27–1000 ℃) have been studied by in situ single-crystal X-ray diffraction. The SrO7 polyhedron expands regularly with the temperature increase. Silicon and aluminum cations are ordered in tetrahedral sites of the studied slawsonite; no significant changes in their distribution as temperature increases were observed. Slawsonite demonstrates a relatively high volume thermal expansion (αV = 23 × 10–6 °C–1) with high anisotropy, typical for framework feldspar-related minerals and synthetic compounds. It was found that, contrary to previously published data, the crystal structure of slawsonite is stable in the studied temperature range and no phase transitions occur up to 1000 °C. The role of Ca and Ba substitution for Sr and Al/Si ordering on polymorphism of natural MAl2Si2O8 (M = Ca, Sr, Ba) is herein discussed.
AB - Slawsonite’s (SrAl2Si2O8) structure evolutions depending on temperature (27–1000 ℃) have been studied by in situ single-crystal X-ray diffraction. The SrO7 polyhedron expands regularly with the temperature increase. Silicon and aluminum cations are ordered in tetrahedral sites of the studied slawsonite; no significant changes in their distribution as temperature increases were observed. Slawsonite demonstrates a relatively high volume thermal expansion (αV = 23 × 10–6 °C–1) with high anisotropy, typical for framework feldspar-related minerals and synthetic compounds. It was found that, contrary to previously published data, the crystal structure of slawsonite is stable in the studied temperature range and no phase transitions occur up to 1000 °C. The role of Ca and Ba substitution for Sr and Al/Si ordering on polymorphism of natural MAl2Si2O8 (M = Ca, Sr, Ba) is herein discussed.
KW - slawsonite
KW - feldspar
KW - crystal structure
KW - thermal expansion
KW - high temperature
KW - single-crystal X-ray diffraction
KW - Thermal expansion
KW - Slawsonite
KW - High temperature
KW - Single-crystal X-ray diffraction
KW - Crystal structure
KW - Feldspar
UR - https://www.mdpi.com/2075-163X/11/10/1150
UR - http://www.scopus.com/inward/record.url?scp=85117190879&partnerID=8YFLogxK
U2 - 10.3390/min11101150
DO - 10.3390/min11101150
M3 - Article
VL - 11
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 10
M1 - 1150
ER -
ID: 86670729