scholarly journals Single-crystal to single-crystal conformational polymorphic transformation in tolbutamide at 313 K. Relation to other polymorphic transformations in tolbutamide and chlorpropamide

CrystEngComm ◽  
2016 ◽  
Vol 18 (30) ◽  
pp. 5736-5743 ◽  
Author(s):  
T. N. Drebushchak ◽  
V. A. Drebushchak ◽  
N. A. Pankrushina ◽  
E. V. Boldyreva
Keyword(s):  
Single Crystal ◽  
Polymorphic Transformation ◽  
Polymorphic Transformations

In situsynchrotron powder diffraction study of active belite clinkers

2007 ◽  
Vol 40 (6) ◽  
pp. 999-1007 ◽  
Author(s):  
Ángeles G. De la Torre ◽  
Khadija Morsli ◽  
Mohammed Zahir ◽  
Miguel A.G. Aranda
Keyword(s):  
High Temperature ◽  
High Resolution ◽  
Powder Diffraction ◽  
Polymorphic Transformation ◽  
High Energy ◽  
Dicalcium Silicate ◽  
Polymorphic Transformations ◽  
X Ray ◽  
High Temperature Reactions

The clinkerization processes to form belite clinkers, with theoretical compositions close to 60 wt% of Ca2SiO4, have been studiedin situby high-resolution high-energy (λ = 0.30 Å) synchrotron X-ray powder diffraction. In order to obtain active belite cements, different amounts of K2O, Na2O and SO3have been added. The existence range of the high-temperature phases has been established and, furthermore, Rietveld quantitative phase analyses at high temperature have been performed for all patterns. The following high-temperature reactions have been investigated: (i) polymorphic transformations of dicalcium silicate, \alpha_{\rm L}'-Ca2SiO4↔ \alpha_{\rm H}'-Ca2SiO4from 1170 to 1230 K, and \alpha_{\rm H}'-Ca2SiO4↔ α-Ca2SiO4from 1500 to 1600 K; (ii) melting of the aluminates phases, Ca3Al2O6and Ca4(Al2Fe2)O10, above ∼1570 K; and (iii) reaction of Ca2SiO4with CaO to yield Ca3SiO5above ∼1550 K. Moreover, in all the studied compositions the temperature of the polymorphic transformation \alpha_{\rm H}'-Ca2SiO4↔ α-Ca2SiO4has decreased with the addition of activators. Finally, active belite clinkers were produced as the final samples contained α-belite phases.

Finite noncrystallographic groups, 11-vertex equi-edged triangulated clusters and polymorphic transformations in metals

2014 ◽  
Vol 70 (6) ◽  
pp. 616-625 ◽  
Author(s):  
Alexander Talis ◽  
Valentin Kraposhin
Keyword(s):  
Experimental Data ◽  
Polymorphic Transformation ◽  
Steiner System ◽  
Polymorphic Transformations ◽  
Tetrahedral Cluster ◽  
Mathieu Group ◽  
One To One ◽  
The One ◽  
System Mapping

The one-to-one correspondence has been revealed between a set of cosets of the Mathieu groupM11, a set of blocks of the Steiner systemS(4, 5, 11) and 11-vertex equi-edged triangulated clusters. The revealed correspondence provides the structure interpretation of theS(4, 5, 11) system: mapping of the biplane 2-(11, 5, 2) onto the Steiner systemS(4, 5, 11) determines uniquely the 11-vertex tetrahedral cluster, and the automorphisms of theS(4, 5, 11) system determine uniquely transformations of the said 11-vertex tetrahedral cluster. The said transformations correspond to local reconstructions during polymorphic transformations in metals. The proposed symmetry description of polymorphic transformation in metals is consistent with experimental data.

scholarly journals Shape Preserving Single Crystal to Amorphous to Single Crystal Polymorphic Transformation Is Possible

2021 ◽  
Author(s):  
Olivier Renier ◽  
Guillaume Bousrez ◽  
Glib V. Baryshnikov ◽  
Veronica Paterlini ◽  
Volodymyr Smetana ◽  
...  
Keyword(s):  
Single Crystal ◽  
Polymorphic Transformation ◽  
Shape Preserving

Influence of partial substitution of Cu atoms by Zn and Cd atoms on polymorphic transformation in the Cu1.75Te crystal

2019 ◽  
Vol 33 (11) ◽  
pp. 1850128 ◽  
Author(s):  
Y. I. Aliyev ◽  
Y. G. Asadov ◽  
R. D. Aliyeva ◽  
T. G. Naghiyev ◽  
S. H. Jabarov
Keyword(s):  
High Temperature ◽  
Polymorphic Transformation ◽  
Lattice Parameters ◽  
Partial Substitution ◽  
Polymorphic Transformations ◽  
X Ray ◽  
Change Mechanism ◽  
Temperature Modification ◽  
Phase Temperature ◽  
High Temperature Modification

The [Formula: see text], [Formula: see text] and [Formula: see text] compounds have been synthesized and low-temperature modification single crystals obtained from the high temperature modification by polymorphic transformation. The method of high temperature X-ray diffractometer has been used to study [Formula: see text] (x = 0.05 Zn and Cd) layered single crystal. It was established that such a substitution has a significant impact on the number and temperature of polymorphic transformations. Crystallgraphic parameters were determined for each phase. Temperature dependence of lattice parameters were obtained and determined change mechanism of lattice parameters by influence of temperature.

Relationships for single crystal growth during polymorphic transformation

1964 ◽  
Vol 2 (9) ◽  
pp. viii
Author(s):  
A.I. Kitaigorodskiy ◽  
Yu.V. Mnyukh ◽  
Yu.G. Asadov
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Polymorphic Transformation ◽  
Single Crystal Growth

Polymorphic Transformations in the K0.945Ag0.055NO3 Single Crystal

2020 ◽  
Vol 65 (2) ◽  
pp. 309-313
Author(s):  
V. I. Nasirov ◽  
R. B. Bairamov ◽  
E. V. Nasirov
Keyword(s):  
Single Crystal ◽  
Polymorphic Transformations

scholarly journals Terahertz spectral investigation of temperature induced polymorphic transformation of 2,2dinitroethylene-1,1-diamine

RSC Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 6247-6253
Author(s):  
Liu Quancheng ◽  
Zhang Qi ◽  
Li Guilin ◽  
Guo Zhicheng ◽  
He Xiangyang ◽  
...  
Keyword(s):  
Dynamic Process ◽  
Polymorphic Transformation ◽  
Spectral Investigation ◽  
Polymorphic Transformations

The dynamic process of polymorphic transformations provides deep insights into the understanding of both the performance of explosives and its packing sensitivity.

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