Research output: Contribution to journal › Article
Atomic nature of the high anisotropy of borate thermal expansion. / Filatov, S.K.; Bubnova, R.S.
In: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B, Vol. 56, No. 1, 2015, p. 24-35.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Atomic nature of the high anisotropy of borate thermal expansion
AU - Filatov, S.K.
AU - Bubnova, R.S.
PY - 2015
Y1 - 2015
N2 - One of the unique features of borate crystals is that, on heating, a majority of them exhibit a strong anisotropy of thermal deformations along some directions in the crystal structure. There may even be negative thermal expansion (i.e. contraction on heating) in some directions. An explanation of this phenomenon is suggested in the present work. The contribution of the three main components of such anisotropy is analysed. These three components are shear deformations, hinge deformations and anisotropic thermal vibrations of atoms, which are well known in the theory of the thermal behaviour of crystalline compounds. The co-occurrence of all three components in borates is what makes their anisotropic thermal deformations record breaking. Oxygen compounds of other classes, e.g. silicates, carbonates, etc., are considered from the same perspectives.
AB - One of the unique features of borate crystals is that, on heating, a majority of them exhibit a strong anisotropy of thermal deformations along some directions in the crystal structure. There may even be negative thermal expansion (i.e. contraction on heating) in some directions. An explanation of this phenomenon is suggested in the present work. The contribution of the three main components of such anisotropy is analysed. These three components are shear deformations, hinge deformations and anisotropic thermal vibrations of atoms, which are well known in the theory of the thermal behaviour of crystalline compounds. The co-occurrence of all three components in borates is what makes their anisotropic thermal deformations record breaking. Oxygen compounds of other classes, e.g. silicates, carbonates, etc., are considered from the same perspectives.
M3 - Article
VL - 56
SP - 24
EP - 35
JO - European journal of glass science and technology. Part B, Physics and chemistry of glasses
JF - European journal of glass science and technology. Part B, Physics and chemistry of glasses
SN - 1753-3562
IS - 1
ER -
ID: 3969060