New Category for Active Pharmaceutical Ingredients, a Low Molecular Weight Organogelator: Crystal Structure of Atorvastatin Calcium and Its Unusual Phase Transition Behavior during Dissolution

2016 ◽  
Vol 16 (12) ◽  
pp. 7198-7204 ◽  
Author(s):  
Bishal Raj Adhikari ◽  
Daeyoung Kim ◽  
Jae Ho Bae ◽  
Jisun Yeon ◽  
K. C. Roshan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Molecular Weight ◽  
Low Molecular Weight ◽  
Active Pharmaceutical Ingredients ◽  
Phase Transition Behavior ◽  
Atorvastatin Calcium ◽  
Pharmaceutical Ingredients ◽  
Transition Behavior

Crystal structure and phase transition behavior of LaSrGaMgO

2004 ◽  
Vol 174 (1-4) ◽  
pp. 193-203 ◽  
Author(s):  
T SHIBASAKI ◽  
T FURUYA ◽  
S WANG ◽  
T HASHIMOTO
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Phase Transition Behavior ◽  
Transition Behavior

Phase Transition Behavior of Barium Titanate Nanoparticles

2006 ◽  
Vol 320 ◽  
pp. 131-134 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Masatomo Yashima ◽  
Yoshihiro Kuroiwa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Barium Titanate ◽  
Fine Particles ◽  
Rietveld Method ◽  
Structure Refinement ◽  
Phase Transition Behavior ◽  
Transition Behavior ◽  
Heating Treatment ◽  
Barium Titanate Nanoparticles

Almost impurity-free, defect-free and dense barium titanate (BaTiO3) fine particles with various sizes from 20 to 430 nm were prepared by the 2-step thermal decomposition method and post-heating treatment. The crystal structures of these particles in the range from -150 to 150 °C were investigated using synchrotron radiation XRD measurement. The crystal structure refinement using Rietveld method revealed that BaTiO3 particles with the size over 40 nm were composed of two parts; (a) cubic shell and (b) core with successive phase transitions. The crystal structure of the core component can be related to the dielectric properties at room temperature. Moreover, it was revealed that the phase transition behavior of BaTiO3 nanoparticles was different from that of the BaTiO3 single crystal.

Synthesis, Crystal Structures, Phase Transition Characterization and Thermal Properties of the (1–x)PbZrO3-xPb(Co1/3Nb2/3)O3 Solid Solution System

2008 ◽  
Vol 55-57 ◽  
pp. 121-124
Author(s):  
W. Banlue ◽  
R. Muanghlua ◽  
Wanwilai C. Vittayakorn ◽  
Naratip Vittayakorn
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Solid Solution ◽  
Composition Range ◽  
Phase Transition Behavior ◽  
Solution System ◽  
Transition Behavior ◽  
First Order Phase Transition ◽  
Low Temperature Crystal Structure ◽  
Solid Solution System

The phase transition behavior of the (1–x) PbZrO3-xPb(Co1/3Nb2/3)O3 (PZCN) solid solution system (0 ≤ x ≤ 0.30) has been investigated by X-ray diffraction and DSC. In the solid solution, for x ≤ 0.20, the transition shows a first-order phase transition behavior and its antiferroelectric (AFE) crystal structure is orthorhombic. The transition temperature gradually decreases with increased Co2+/Nb5+ concentration. On the composition range 0.20 ≤ x ≤ 0.30, a typical relaxor-like behavior is displayed. The low temperature crystal structure is pseudo-cubic in this composition range. With these data, the ferroelectric phase diagram between PZ and PCoN has been established.

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