High-temperature crystal chemistry of normal paraffins

Филатов, С. К.; Kotelnikova, E. N.; Aleksandrova, E. A.

doi:10.1107/s010876738409543x

Cited by 4 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The knowledge of thermal behavior of matter is required for development of solid state physics and chemistry, crystal chemistry, for the productive synthesis of various materials and their technical applications. For the last thirty years high-temperature crystal chemistry of oxides, silicates and other classes of compounds has been intensively developed [1][2][3][4]. Based on crystal structure studies at high temperature it is has been shown that tetrahedra and even octahedra can behave like rigid units which may tilt or rotate relative each other [3,4].…”

Section: Introductionmentioning

confidence: 99%

Strong anisotropic thermal expansion in borates

Бубнова¹,

Филатов

2008

Physica Status Solidi (b)

View full text Add to dashboard Cite

The paper summarizes results of high‐temperature single crystal X‐ray diffraction studies for six borate structures and high‐temperature powder X‐ray diffraction data for about 50 borates. The characteristics on thermal expansion of 50 borates of univalent, bivalent and trivalent metals of different dimensionality and anion structure are listed. The basic principles of high‐temperature borate crystal chemistry emerge from these studies and the regularities of borate thermal behavior are revealed. On heating the BO3 and BO4 polyhedra and rigid groups consisting of these polyhedra practically do not change their configuration and size but sometimes rotate like hinges exhibiting greatly anisotropic thermal expansion including linear negative expansion. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Section: Introductionmentioning

confidence: 99%

Strong anisotropic thermal expansion in borates

Бубнова¹,

Филатов

2008

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…The shear deformations correlate with changes of the unit cell angle parameters, which are not symmetry-fixed. 1 In the case of monoclinic crystals, this is the angle β, and in the case of triclinic crystals, these are angles α, β, and γ. Depending on the crystal structure orientation with respect to coordinate axes, the directions of the maximal and minimal expansion are the tensor parameters α 11 and α 33 (S and RSI), α 33 and α 11 (RSII), and α 22 and α 33 (S 3 R), respectively (Tables 1 and 2).…”

Section: Discussion Of Main Characteristics Of Thermal Deformationsmentioning

confidence: 99%

“…The results are compiled in Table 1. In the conventional orientation of monoclinic crystals, one of the tensor axes (α 22 ) is positioned along the direction b (the 2 or 2 1 axis or the axis normal to the plane of symmetry), 1 and therefore, α 22 = α b . In Fig.…”

Section: Enantiomermentioning

confidence: 99%

“…With regard to thermal expansion or thermal deformations in crystal structures, such studies are predominately considered for inorganic systems, including minerals. [1][2][3][4][5][6][7] Examinations of thermal deformations in crystal structures of organic substances are much scarcer. This fact was mentioned by B. K. Saha 8 in a recently published review that summarizes data on thermal expansion of organic crystals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal deformations of crystal structures formed in the systems of malic acid enantiomers and l-valine–l-isoleucine enantiomers

2018

View full text Add to dashboard Cite

The thermal behavior of discrete phases formed in the respective systems of malic acid enantiomers and L-enantiomers of the amino acids valine and isoleucine was studied using the temperature-resolved PXRD method. In the (S)-malic acid-(R)-malic acid system, thermal deformations in crystal structures of stable compounds (enantiomer S, racemates RSI and RSII, and non-equimolar compound S 3 R) and polymorph transformations of metastable compounds (racemate RSIII and non-equimolar compound 3S1R) were examined. In the L-valine-L-isoleucine system, thermal deformations in crystal structures of stable compounds L-Val and L-Ile and non-equimolar compound V 2 I were investigated. Thermal deformation analysis included plotting the temperature dependence of the unit cell parameters and volume, calculating thermal deformation tensors, plotting figures of thermal expansion coefficients (CTE), and estimating the extent of thermal deformation anisotropy. In all the cases studied, the maximal thermal expansion was observed in the direction of the weakest hydrogen (malic acid) or van der Waals (valine and isoleucine) intermolecular bonds, i.e. in the directions closest to that perpendicular to the dimer molecule chains (malic acid) or to molecular layers (valine and isoleucine). The strongest anisotropy of thermal deformations in monoclinic crystals was observed in the ac plane, in which the symmetrically unfixed angle β can vary.

show abstract

“…Such a lattice loosening (lower multiplicity of the occupied positions) results in weakening of bond energy and in increase of free energy in the crystal. Si 4+ ions in GSO lattice have the rigid crystallographic coordination [4]. Such coordination polyhedra are very durable in a wide range of thermodynamic conditions.…”

Section: Introductionmentioning

confidence: 96%

Mechanical Properties and Lattice Parameters of Lu_2xGd_2(1-x)SiO₅:Ce Scintillation Crystals

et al. 2010

View full text Add to dashboard Cite

Structural and mechanical characteristics of complex oxide compounds Lu 2x Gd 2−2x SiO 5 :Ce (LGSO) crystals were studied at different cation ratio in the host. For this purpose, a series of LGSO crystals with Lu concentration 5-70 at.% has been grown by the Czochralski method. Anisotropy of mechanical properties for these materials has been studied. The obtained results can be useful at choice of optimal growth direction for crystals and at mechanical processing of scintillation elements.

show abstract

High-temperature crystal chemistry of normal paraffins

Cited by 4 publications

References 0 publications

Strong anisotropic thermal expansion in borates

Strong anisotropic thermal expansion in borates

Thermal deformations of crystal structures formed in the systems of malic acid enantiomers and l-valine–l-isoleucine enantiomers

Mechanical Properties and Lattice Parameters of Lu_2xGd_2(1-x)SiO₅:Ce Scintillation Crystals

Contact Info

Product

Resources

About

High-temperature crystal chemistry of normal paraffins

Cited by 4 publications

References 0 publications

Strong anisotropic thermal expansion in borates

Strong anisotropic thermal expansion in borates

Thermal deformations of crystal structures formed in the systems of malic acid enantiomers and l-valine–l-isoleucine enantiomers

Mechanical Properties and Lattice Parameters of Lu2xGd2(1-x)SiO5:Ce Scintillation Crystals

Contact Info

Product

Resources

About

Mechanical Properties and Lattice Parameters of Lu_2xGd_2(1-x)SiO₅:Ce Scintillation Crystals