scholarly journals Dynamic Mechanical Behaviour of Organic Molecular Crystals. II. Elastic Constants of Single-Crystal Anthracene

1968 ◽  
Vol 41 (8) ◽  
pp. 1783-1787 ◽  
Author(s):  
Takaaki Danno ◽  
Hiroo Inokuchi
Keyword(s):  
Single Crystal ◽  
Elastic Constants ◽  
Mechanical Behaviour ◽  
Molecular Crystals ◽  
Dynamic Mechanical ◽  
Organic Molecular Crystals

scholarly journals Dynamic Mechanical Behaviour of Organic Molecular Crystals. I

1967 ◽  
Vol 40 (12) ◽  
pp. 2793-2795 ◽  
Author(s):  
Takaaki Danno ◽  
Takashi Kajiwara ◽  
Hiroo Inokuchi
Keyword(s):  
Mechanical Behaviour ◽  
Molecular Crystals ◽  
Dynamic Mechanical ◽  
Organic Molecular Crystals

Elastische und thermoelastische Konstanten des rhombischen α-Schwefels

1969 ◽  
Vol 24 (5) ◽  
pp. 865 ◽  
Author(s):  
S. Haussühl
Keyword(s):  
Thermal Expansion ◽  
Elastic Constants ◽  
Elastic Anisotropy ◽  
Molecular Crystals ◽  
Organic Molecular Crystals ◽  
Anisotropy Of Thermal Expansion ◽  
Cauchy Relations

Abstract The elastic and thermoelastic constants of α-sulphur are measured by the Schaefer-Bergman method. The magnitude of the elastic constants is slightly higher than in comparable organic molecular crystals. The elastic anisotropy and the anisotropy of thermal expansion obey the Grüneisen relation. The deviations from the Cauchy relations are all negative. This is usually only observed in crystals with covalent bind­ing components or with a highly anharmonic behaviour.

Solid state amorphization of organic molecular crystals using a vibrating mill

1995 ◽  
Vol 94 (12) ◽  
pp. 1013-1018 ◽  
Author(s):  
Itaru Tsukushi ◽  
Osamu Yamamuro ◽  
Takasuke Matsuo
Keyword(s):  
Solid State ◽  
Molecular Crystals ◽  
Organic Molecular Crystals ◽  
State Amorphization

scholarly journals Role of Conical Intersections on the Efficiency of Fluorescent Organic Molecular Crystals

2021 ◽  
Vol 125 (4) ◽  
pp. 1012-1024
Author(s):  
Miguel Rivera ◽  
Ljiljana Stojanović ◽  
Rachel Crespo-Otero
Keyword(s):  
Molecular Crystals ◽  
Conical Intersections ◽  
Organic Molecular Crystals

scholarly journals Generalization of intrinsic ductile-to-brittle criteria by Pugh and Pettifor for materials with a cubic crystal structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
O. N. Senkov ◽  
D. B. Miracle
Keyword(s):  
Crystal Structure ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Single Crystal ◽  
Elastic Constants ◽  
Mechanical Analysis ◽  
Quantum Mechanical ◽  
Modulus Ratio ◽  
Cubic Crystal ◽  
The Difference

AbstractTwo classical criteria, by Pugh and Pettifor, have been widely used by metallurgists to predict whether a material will be brittle or ductile. A phenomenological correlation by Pugh between metal brittleness and its shear modulus to bulk modulus ratio was established more than 60 years ago. Nearly four decades later Pettifor conducted a quantum mechanical analysis of bond hybridization in a series of intermetallics and derived a separate ductility criterion based on the difference between two single-crystal elastic constants, C12–C44. In this paper, we discover the link between these two criteria and show that they are identical for materials with cubic crystal structures.

Wechselwirkungen in Molekülkristallen, 160 [1,2]. Kristallzüchtung und Strukturbestimmung der verschiedenartigen Polyphenyl-Kontaktionenmultipel [p-Quaterphenylee⊖⊖][Na⊕(DME)3]2, [p-Quaterphenyl⊖⊖(Na⊕(THF)3)2] und [p-Terphenyl⊖⊖Na⊕(DME)2Na⊕(DME)]2 / Interaction in Molecular Crystals, 160 [1, 2]. Crystallization and Structure Determination of the Different Polyphenyl Contact Ion Multiples [p-Quaterphenylee⊖⊖][Na⊕(DME)3]2, [p-Quaterphenyl⊖⊖(Na⊕(THF)3)2] und [p-Terphenyl⊖⊖Na⊕(DME)2Na⊕(DME)]2

2000 ◽  
Vol 55 (12) ◽  
pp. 1103-1113 ◽  
Author(s):  
Hans Bock ◽  
K. Gharagozloo-Hubmann ◽  
M. Sievert
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Sodium Salt ◽  
Structure Determination ◽  
Metal Cation ◽  
Molecular Crystals ◽  
Sodium Salts ◽  
Structure Determinations ◽  
Cation Coordination

The π-hydrocarbons p-terphenyl and p-quaterphenyl are reduced to their dianions in aprotic solutions of different ethers at sodium metal mirrors. Single crystal structure determinations of the solvent-separated or solvens-shared contact ion multiples, [p-terphenyl⊖⊖ Na⊕(DME)2Na⊕DME]2, p-quaterphenyl⊖⊖ ][Na⊕(DME)3]2 and [p-quaterpheny⊖⊖( Na⊕(THF)3)2], prove the essential cation solvation by the chelating dimethoxyethane (DME) versus the bulky tetrahydrofuran (THF) ligands: The solution network of equilibria between solvent separated and solvent shared ion aggregates can be considerably and transparently modified by the ether solvent selected. In addition, the structures of the monomeric sodium salts reveal partly novel details of metal cation coordination by contacts Na⊕ ··· O as well as Na⊕ ··· Cπ such as in the dimeric sodium salt of p-terphenyl dianion, [(DME)2Na⊕ (terphenyl⊖⊖)(Na⊕ DME)(terphenyl⊖⊖)Na⊕ (DME)2].

Sign in / Sign up

Export Citation Format

Share Document