Anomalous thermal expansion behaviour of Na8[AlSiO4]6(NO3)2-sodalite: P4̅3n to Pm3̅n phase transition by untilting and contraction of TO4 units

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
C. H. Rüscher ◽  
Th.M. Gesing ◽  
J.-Ch. Buhl
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Single Crystal ◽  
Specific Heat ◽  
X Ray ◽  
Thermal Expansion Behaviour ◽  
Anomalous Thermal Expansion ◽  
Expansion Behaviour

AbstractX-ray single crystal, X-ray powder and specific heat investigations were carried out on alumosilicate NaNO(

Anomalous thermal expansion of cobalt olivine, Co2SiO4, at low temperatures

2010 ◽  
Vol 43 (4) ◽  
pp. 720-728 ◽  
Author(s):  
Andrew Sazonov ◽  
Vladimir Hutanu ◽  
Martin Meven ◽  
Gernot Heger ◽  
Thomas Hansen ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Structural Parameters ◽  
Quantitative Description ◽  
Lattice Parameter ◽  
Single Crystal Diffraction ◽  
Interatomic Distances ◽  
Thermal Expansion Behaviour ◽  
Anomalous Thermal Expansion ◽  
Capacity Data ◽  
Expansion Behaviour

The temperature variation of the Co2SiO4structural parameters has been investigated by means of both neutron powder and single-crystal diffraction. Measurements were performed in a broad temperature range from 5 to 500 K. There is clear evidence of an anomalous thermal expansion related to the magnetic phase transition at 50 K. Below this temperature an abrupt elongation and contraction were observed along thecandbaxes (space groupPnma), respectively, whereas the lattice parameteraremains constant in the range between 5 and 50 K. The resulting volume of the unit cell is contracted below 50 K. This phenomenon is attributed to magnetostriction effects. A model based on the specific heat capacity data was applied for the quantitative description of the anomalous thermal expansion behaviour. On the other hand, no anomalies can be observed in the temperature dependency of the interatomic distances and angles.

Anomalous thermal expansion behaviour of Ln2Mo4O15 (Ln = Y, Dy, Ho, Tm)

2003 ◽  
Vol 103 (3) ◽  
pp. 289-296 ◽  
Author(s):  
L Sebastian ◽  
S Sumithra ◽  
J Manjanna ◽  
A.M Umarji ◽  
J Gopalakrishnan
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Behaviour ◽  
Anomalous Thermal Expansion ◽  
Expansion Behaviour

A thermo-responsive structural switch and colossal anisotropic thermal expansion in a chiral organic solid

2018 ◽  
Vol 54 (30) ◽  
pp. 3727-3730 ◽  
Author(s):  
Agnieszka Janiak ◽  
Catharine Esterhuysen ◽  
Leonard J. Barbour
Keyword(s):  
Thermal Expansion ◽  
Thermally Induced ◽  
Anisotropic Thermal Expansion ◽  
Thermal Expansion Behaviour ◽  
Organic Solid ◽  
Polymorphic Forms ◽  
Anomalous Thermal Expansion ◽  
Expansion Behaviour

The apohost form of a chiral trianglimine compound exists in at least three polymorphic forms. Despite similar packing arrangements, only two of these forms exhibit anomalous thermal expansion behaviour, and undergo thermally-induced interconversion.

scholarly journals Hydration-dependent anomalous thermal expansion behaviour in a coordination polymer

2016 ◽  
Vol 52 (15) ◽  
pp. 3231-3234 ◽  
Author(s):  
Prem Lama ◽  
Lukman O. Alimi ◽  
Raj Kumar Das ◽  
Leonard J. Barbour
Keyword(s):  
Thermal Expansion ◽  
Coordination Polymer ◽  
Water Molecules ◽  
Anisotropic Thermal Expansion ◽  
Thermal Expansion Behaviour ◽  
Anomalous Thermal Expansion ◽  
Expansion Behaviour

A polar coordination polymer has been synthesised that exhibits anomalous anisotropic thermal expansion. The guest water molecules of the as-synthesised complex can be removed on activation without loss of crystal singularity to yield the fully dehydrated form that shows considerably different thermal expansion behaviour compared to its hydrated analogue.

scholarly journals Compositional Inhomogeneity and Tuneable Thermal Expansion in Mixed-Metal ZIF-8 Analogues

2018 ◽  
Author(s):  
Adam Sapnik ◽  
Harry Geddes ◽  
Emily Reynolds ◽  
Hamish Yeung ◽  
Andrew Goodwin
Keyword(s):  
Thermal Expansion ◽  
Variable Temperature ◽  
Metal Organic Frameworks ◽  
Negative Thermal Expansion ◽  
Cation Substitution ◽  
X Ray ◽  
Thermal Expansion Behaviour ◽  
Metal Organic ◽  
Complete Miscibility ◽  
Expansion Behaviour

<div>We study the structural and thermomechanical effects</div><div>of cation substitution in the compositional family of</div><div>metal–organic frameworks Zn1􀀀xCdx(mIm)2 (HmIm = 2-</div><div>methylimidazole). We find complete miscibility for all</div><div>compositions x, with evidence of inhomogeneous distributions of Cd and Zn that in turn affect framework aperture characteristics. Using variable-temperature X-ray powder diffraction measurements, we show that Cd substitution drives a threefold reduction in the magnitude of thermal expansion behaviour. We interpret this effect in terms of an increased density of negative thermal expansion modes in the more flexible Cd-rich frameworks.</div>

scholarly journals Compositional Inhomogeneity and Tuneable Thermal Expansion in Mixed-Metal ZIF-8 Analogues

2018 ◽  
Author(s):  
Adam Sapnik ◽  
Harry Geddes ◽  
Emily Reynolds ◽  
Hamish Yeung ◽  
Andrew Goodwin
Keyword(s):  
Thermal Expansion ◽  
Variable Temperature ◽  
Metal Organic Frameworks ◽  
Negative Thermal Expansion ◽  
Cation Substitution ◽  
X Ray ◽  
Thermal Expansion Behaviour ◽  
Metal Organic ◽  
Complete Miscibility ◽  
Expansion Behaviour

<div>We study the structural and thermomechanical effects</div><div>of cation substitution in the compositional family of</div><div>metal–organic frameworks Zn1􀀀xCdx(mIm)2 (HmIm = 2-</div><div>methylimidazole). We find complete miscibility for all</div><div>compositions x, with evidence of inhomogeneous distributions of Cd and Zn that in turn affect framework aperture characteristics. Using variable-temperature X-ray powder diffraction measurements, we show that Cd substitution drives a threefold reduction in the magnitude of thermal expansion behaviour. We interpret this effect in terms of an increased density of negative thermal expansion modes in the more flexible Cd-rich frameworks.</div>

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