Thermal expansion and structural transformations of stuffed derivatives of quartz along the LiAlSiO 4 -SiO 2 join: a variable-temperature powder synchrotron XRD study

2001 ◽  
Vol 28 (5) ◽  
pp. 302-312 ◽  
Author(s):  
H. Xu ◽  
P. J. Heaney ◽  
A. Navrotsky
Keyword(s):  
Thermal Expansion ◽  
Variable Temperature ◽  
Structural Transformations ◽  
Xrd Study ◽  
Derivatives Of ◽  
Synchrotron Xrd

Using Variable Temperature Powder X-ray Diffraction To Determine the Thermal Expansion Coefficient of Solid MgO

2007 ◽  
Vol 84 (5) ◽  
pp. 818 ◽  
Author(s):  
Nicholas C. Corsepius ◽  
Thomas C. DeVore ◽  
Barbara A. Reisner ◽  
Deborah L. Warnaar
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Giant anisotropic thermal expansion actuated by thermodynamically assisted reorientation of imidazoliums in a single crystal

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zi-Shuo Yao ◽  
Hanxi Guan ◽  
Yoshihito Shiota ◽  
Chun-Ting He ◽  
Xiao-Lei Wang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Single Crystal ◽  
Molecular Motion ◽  
Bulk Material ◽  
Shape Change ◽  
Variable Temperature ◽  
Negative Thermal Expansion ◽  
Formidable Challenge ◽  
Potential Applications ◽  
Molecular Cations

Abstract Materials demonstrating unusual large positive and negative thermal expansion are fascinating for their potential applications as high-precision microscale actuators and thermal expansion compensators for normal solids. However, manipulating molecular motion to execute huge thermal expansion of materials remains a formidable challenge. Here, we report a single-crystal Cu(II) complex exhibiting giant thermal expansion actuated by collective reorientation of imidazoliums. The circular molecular cations, which are rotationally disordered at a high temperature and statically ordered at a low temperature, demonstrate significant reorientation in the molecular planes. Such atypical molecular motion, revealed by variable-temperature single crystal X-ray diffraction and solid-state NMR analyses, drives an exceptionally large positive thermal expansion and a negative thermal expansion in a perpendicular direction of the crystal. The consequent large shape change (~10%) of bulk material, with remarkable durability, suggests that this complex is a strong candidate as a microscale thermal actuating material.

Novel high-pressure behavior in chlorite: A synchrotron XRD study of clinochlore to 27 GPa

2004 ◽  
Vol 89 (8-9) ◽  
pp. 1337-1340 ◽  
Author(s):  
Mark D. Welch ◽  
Annette K. Kleppe ◽  
Andrew P. Jephcoat
Keyword(s):  
High Pressure ◽  
Pressure Behavior ◽  
Xrd Study ◽  
Synchrotron Xrd

scholarly journals An examination of the thermal expansion of urea using high-resolution variable-temperature X-ray powder diffraction

2005 ◽  
Vol 38 (6) ◽  
pp. 1038-1039 ◽  
Author(s):  
Robert Hammond ◽  
Klimentina Pencheva ◽  
Kevin J. Roberts ◽  
Patricia Mougin ◽  
Derek Wilkinson
Keyword(s):  
Thermal Expansion ◽  
High Resolution ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
Polymorphic Transformations ◽  
X Ray ◽  
Thermal Expansion Coefficients ◽  
Cell Dimensions ◽  
Expansion Coefficients ◽  
Unit Cell Dimensions

Variable-temperature high-resolution capillary-mode powder X-ray diffraction is used to assess changes in unit-cell dimensions as a function of temperature over the range 188–328 K. No evidence was found for any polymorphic transformations over this temperature range and thermal expansion coefficients for urea were found to be αa= (5.27 ± 0.26) × 10−5 K−1and αc= (1.14 ± 0.057) × 10−5 K−1.

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