scholarly journals Investigation of the Order–Disorder Rotator Phase Transition in KSiH3 and RbSiH3

2017 ◽  
Vol 121 (9) ◽  
pp. 5241-5252 ◽  
Author(s):  
Reji Nedumkandathil ◽  
Aleksander Jaworski ◽  
Andreas Fischer ◽  
Carin Österberg ◽  
Yuan-Chih Lin ◽  
...  
Keyword(s):  
Phase Transition ◽  
Rotator Phase

Kinetic Study of the Rotator Phase Transition inn-Alkane: Growth of the Rotator Phase

1998 ◽  
Vol 37 (Part 1, No. 6A) ◽  
pp. 3450-3456 ◽  
Author(s):  
Koji Nozaki ◽  
Masamichi Hikosaka
Keyword(s):  
Phase Transition ◽  
Kinetic Study ◽  
Rotator Phase

1H nuclear magnetic resonance, differential scanning calorimetry, and electrical conductivity studies on the phase transitions of pentylammonium chloride and the cationic self-diffusion in its rotator phase

1988 ◽  
Vol 66 (8) ◽  
pp. 1961-1969 ◽  
Author(s):  
Shigehiko Iwai ◽  
Ryuichi Ikeda ◽  
Daiyu Nakamura
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Differential Scanning Calorimetry ◽  
Room Temperature ◽  
Stable Phase ◽  
Scanning Calorimetry ◽  
Nmr Studies ◽  
Self Diffusion ◽  
H Nmr ◽  
Rotator Phase

Measurements of 1H nmr, differential thermal analysis, and differential scanning calorimetry have revealed that solid pentylammonium chloride, cooled rapidly from room temperature, forms a mixture of the stable and metastable low-temperature phases below the phase transition temperature, Ttr (238 K). The sample annealed just below Ttr for 3 h was shown to consist of a single stable phase down to about 100 K, indicating the existence of a time-consuming phase transition taking place successively just below the normal transition. In the rotator phase obtainable above Ttr (257 K), 1H nmr studies proved the presence of axial rotation of the whole cation about the long axis, similar to n-paraffins in their rotator phase. Above room temperature, the onset of the translational self-diffusion of the cations within 2D planes in the layer structure of the rotator phase was detected by measuring the temperature dependence of electrical conductivity as well as 1H T1 and T1p. 2D self-diffusion constants and diffusional correlation times evaluated from the electrical conductivity observed between room and the melting temperatures indicate that the 2D cationic diffusion near the melting point is as fast as 3D self-diffusion in usual plastic crystals. Cationic motions in the two different rotator phases α and α′ are compared.

Kinetic Study of the Rotator Phase Transition in ann-Alkane (n-C25H52) Crystal: Nucleation and Growth on Cooling

2001 ◽  
Vol 40 (Part 1, No. 12) ◽  
pp. 6918-6926 ◽  
Author(s):  
Koji Nozaki ◽  
Masanao Munekane ◽  
Masamichi Hikosaka ◽  
Takashi Yamamoto
Keyword(s):  
Phase Transition ◽  
Kinetic Study ◽  
Nucleation And Growth ◽  
Crystal Nucleation ◽  
Rotator Phase

Evidence of a phase transition in the rotator phase of the odd‐numbered paraffins C23H48 and C25H52

1981 ◽  
Vol 75 (10) ◽  
pp. 5125-5127 ◽  
Author(s):  
J. Doucet ◽  
I. Denicolo ◽  
A. Craievich ◽  
A. Collet
Keyword(s):  
Phase Transition ◽  
Rotator Phase
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