scholarly journals Исследование кинетики твердофазного перехода в тетракозане С-=SUB=-24-=/SUB=-Н-=SUB=-50-=/SUB=- методом высокоразрешающей синхротронной рентгеновской порошковой дифракции

2019 ◽  
Vol 61 (6) ◽  
pp. 1190
Author(s):  
B.A. Марихин ◽  
П.В. Дороватовский ◽  
Я.B. Зубавичус ◽  
M.B. Байдакова ◽  
E.M. Иванькова ◽  
...  
Keyword(s):  
Phase Transition ◽  
Small Angle ◽  
Diffuse Phase Transition ◽  
Basic Research ◽  
X Ray Diffraction ◽  
Kurchatov Institute ◽  
X Ray ◽  
First Order ◽  
Basic Research Project ◽  
Diffuse Phase

With the help of small angle X-ray diffraction using synchrotron X-ray beamline"Belok" in NRC «Kurchatov Institute» was shown that the first order sold phase transition in the tetracosane C24H50 develops by a heterogeneous mechanism in a very narrow thermal interval (delta ≈0,1K ) in accordance with the theory of diffuse phase transition. The work was financially supported by the Presidium RAN Program №32 "Nanostructures: physics, chemistry, biology, basics of technology" and Russian Foundation of Basic Research (project 16-03-00493А) using beamline "Belok" in NRC

scholarly journals Smectic A: cholesteric phase transition investigated by small angle X-ray diffraction and viscosity measurements

2002 ◽  
Vol 32 (2b) ◽  
pp. 495-500 ◽  
Author(s):  
E. L. Duarte ◽  
R. Itri ◽  
A. R. Sampaio ◽  
M. Simões ◽  
A. J. Palangana
Keyword(s):  
Phase Transition ◽  
Small Angle ◽  
X Ray Diffraction ◽  
Cholesteric Phase ◽  
X Ray ◽  
Viscosity Measurements ◽  
Smectic A

The Macromolecular Structure of Collagen in Tendon Fibres of Dermatosparactic Animals

1986 ◽  
Vol 41 (4) ◽  
pp. 489-492 ◽  
Author(s):  
E. Mosler ◽  
W. Folkhard ◽  
W. Geercken ◽  
O. Helle ◽  
E. Knorzer ◽  
...  
Keyword(s):  
Small Angle ◽  
Macromolecular Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Order Reflection ◽  
Tendon Collagen

Small-angle x-ray diffraction spectra of dermatosparactic tendon collagen show a decreased intensity of the first order reflection. We interprete this finding to be due to the N-terminal propeptide which fills the intermolecular gap region partially.

scholarly journals Structure determination and phase transition behaviour of dimethyl sulfate

2006 ◽  
Vol 62 (2) ◽  
pp. 280-286 ◽  
Author(s):  
Richard M. Ibberson ◽  
Mark T. F. Telling ◽  
Simon Parsons
Keyword(s):  
Phase Transition ◽  
Dimethyl Sulfate ◽  
Monoclinic Structure ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Coordination Environment ◽  
Space Group ◽  
X Ray ◽  
First Order ◽  
Transition Behaviour

The crystal structures of phase I and phase II of dimethyl sulfate, (CH3O)2SO2, have been determined using complementary high-resolution neutron powder and single-crystal X-ray diffraction techniques. Below its melting point of 241 K dimethyl sulfate crystallizes in an orthorhombic structure (I) in the space group Fdd2. On cooling below ∼175 K the crystal transforms to a monoclinic structure (II) in the space group I2/a. The molecule is located on a twofold axis (Z′ = 1/2) in both structures. The phase transition is of first order with strong hysteresis. The phase transition results in changes to both the intra- and the intermolecular coordination environment.

scholarly journals Crystal structure of the high-P polymorph of Ca2B6O6(OH)10·2(H2O) (meyerhofferite)

2021 ◽  
Vol 77 (6) ◽  
Author(s):  
Davide Comboni ◽  
Tomasz Poreba ◽  
Francesco Pagliaro ◽  
Tommaso Battiston ◽  
Paolo Lotti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
High Pressure ◽  
Large Volume ◽  
Atomic Scale ◽  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Structural Differences

The crystal structure of the high-pressure polymorph of meyerhofferite, ideally Ca2B6O6(OH)10·2(H2O), has been determined by means of single-crystal synchrotron X-ray diffraction data. Meyerhofferite undergoes a first-order isosymmetric phase transition to meyerhofferite-II, bracketed between 3.15 and 3.75 GPa, with a large volume discontinuity. The phase transition is marked by an increase in the coordination number of the boron B1 site, from III to IV, leading to a more interconnected and less compressible structure. The main structural differences between the two polymorphs and the P-induced deformation mechanisms at the atomic scale are discussed.

X-ray and neutron diffraction studies of the diffuse phase transition in ceramics

1991 ◽  
Vol 91 (2) ◽  
pp. 350-361 ◽  
Author(s):  
P. Bonneau ◽  
P. Garnier ◽  
G. Calvarin ◽  
E. Husson ◽  
J.R. Gavarri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Diffuse Phase Transition ◽  
X Ray ◽  
Diffuse Phase
Sign in / Sign up

Export Citation Format

Share Document