Mechanical behavior of polytetrafluoroethylene around the room-temperature first-order transition

1969 ◽  
Vol 9 (4) ◽  
pp. 268-276 ◽  
Author(s):  
G. P. Koo ◽  
R. D. Andrews
Keyword(s):  
Mechanical Behavior ◽  
Room Temperature ◽  
Order Transition ◽  
First Order ◽  
First Order Transition

Preparation, Characterization and Crystal Structure of the Room Temperature Phase of [(CH3)(C6H5)3P]2[ZnBr4]: A Member of the A2BX4 Family

2007 ◽  
Vol 62 (9) ◽  
pp. 549-554 ◽  
Author(s):  
Mohga F. Mostafa ◽  
Ahmed A. Youssef ◽  
Thanaa S. El-Dean ◽  
Aisha M. Mostafa ◽  
Ibrahim S Farag
Keyword(s):  
Crystal Structure ◽  
Room Temperature ◽  
Lattice Parameters ◽  
Order Transition ◽  
Temperature Phase ◽  
Scanning Calorimetry ◽  
Higher Symmetry ◽  
First Order ◽  
Second Order Transition ◽  
First Order Transition

The compound bis(methyltriphenylphosphonium) tetrabromozincate(II), [C19H18P]2[ZnBr4], Mr = 939.640, has a monoclinic unit cell, space group P21. The lattice parameters are a = 9.7693(4) Å , b = 12.5508(4) Å , c = 16.5372(6) Å , α = 90.00°, β = 105.2670(11)°, γ = 90.00°, V = 1956.11(11) Å3, Z = 2, Dx = 1.595 mgm−3 at T = 298 K. The structure consists of one distorted [ZnBr4]2− tetrahedron and two [(CH3)(C6H5)3P]+ cations. Differential scanning calorimetry indicates a continuous second-order transition at (276±2) K that may be classified as a commensurate to incommensurate transformation. A first-order transition to a higher symmetry is associated with a four-fold rotation of the [ZnBr4]2− ion and a change of entropy ΔS = 22.92 J/(K· mol) at T = (362±3) K.Dilatometric measurements showed a decrease of the lattice parameters in the temperature range 230 - 260 K, confirmed the transition at (276±2) K, and indicated the presence of a third transition at 282 K.

scholarly journals First Order Transition for the Optimal Search Time of Lévy Flights with Resetting

2014 ◽  
Vol 113 (22) ◽  
Author(s):  
Lukasz Kusmierz ◽  
Satya N. Majumdar ◽  
Sanjib Sabhapandit ◽  
Grégory Schehr
Keyword(s):  
Search Time ◽  
Order Transition ◽  
Optimal Search ◽  
Lévy Flights ◽  
First Order ◽  
Levy Flights ◽  
First Order Transition

Fluctuation-induced first-order transition in the Hubbard model

1990 ◽  
Vol 74 (11) ◽  
pp. 1175-1179 ◽  
Author(s):  
M.D. Coutinho-Filho ◽  
M.L. Lyra ◽  
A.M. Nemirovsky
Keyword(s):  
Hubbard Model ◽  
Order Transition ◽  
First Order ◽  
First Order Transition

Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13

2015 ◽  
Vol 9 (2) ◽  
pp. 136-140 ◽  
Author(s):  
Anja Waske ◽  
Lars Giebeler ◽  
Bruno Weise ◽  
Alexander Funk ◽  
Manuel Hinterstein ◽  
...  
Keyword(s):  
Order Transition ◽  
Particle State ◽  
First Order ◽  
First Order Transition
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