Laser Raman study of the low-temperature phase transformation in [N(CH3)4]2CuCl4 single crystals

1991 ◽  
Vol 47 (5) ◽  
pp. 629-636 ◽  
Author(s):  
R.P. Rathore ◽  
T. Chakraborty ◽  
A.L. Verma
Keyword(s):  
Phase Transformation ◽  
Low Temperature ◽  
Single Crystals ◽  
Temperature Phase ◽  
Laser Raman ◽  
Raman Study ◽  
Low Temperature Phase

Raman study of low temperature phase transitions in the cubic perovskite CH3NH3PbCI3

1998 ◽  
Vol 64 (4) ◽  
pp. 179-190 ◽  
Author(s):  
A. Maaej ◽  
M. Bahri ◽  
Y. Abid ◽  
N. Jaidane ◽  
Z. B. Lakhdar ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Raman Study ◽  
Low Temperature Phase

Low-Temperature Phase Transition Detected by ESR in α′-(BEDT-TTF)2IBr2 Single Crystals

2011 ◽  
Vol 41 (2-4) ◽  
pp. 363-370
Author(s):  
Alisa Chernenkaya ◽  
Marina Kirman ◽  
Alexei Dmitriev ◽  
Roman Morgunov ◽  
Oksana Koplak ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Single Crystals ◽  
Temperature Phase ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

On the Order-Disorder Phase Transformation of Anilinium Halides.

1981 ◽  
Vol 36 (9) ◽  
pp. 967-974 ◽  
Author(s):  
Gerhard Fecher ◽  
Alarich Weiss ◽  
Gernot Heger
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
High Temperature ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Temperature Phase ◽  
Ordered Structure ◽  
Low Temperature Phase

Abstract The crystal structure of the low temperature phase of anilinium bromide, C6H5NH3⊕Br⊖, was studied by neutron diffraction at T = 100 K. The refinement supports an ordered structure. The structures of the low and high temperature phases are compared and the mechanism of the phase transformation is discussed.

Irreversible single-crystal to polycrystal and reversible single-crystal to single-crystal phase transformations in cyanurates

2001 ◽  
Vol 57 (6) ◽  
pp. 791-799 ◽  
Author(s):  
Menahem Kaftory ◽  
Mark Botoshansky ◽  
Moshe Kapon ◽  
Vitaly Shteiman
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Low Temperature ◽  
Single Crystal ◽  
High Temperature Phase ◽  
Monoclinic Space Group ◽  
Temperature Phase ◽  
Space Group ◽  
Reversible Phase ◽  
Low Temperature Phase

4,6-Dimethoxy-3-methyldihydrotriazine-2-one (1) undergoes a single-crystal to single-crystal reversible phase transformation at 319 K. The low-temperature phase crystallizes in monoclinic space group P21/n with two crystallographically independent molecules in the asymmetric unit. The high-temperature phase is obtained by heating a single crystal of the low-temperature phase. This phase is orthorhombic, space group Pnma, with the molecules occupying a crystallographic mirror plane. The enthalpy of the transformation is 1.34 kJ mol−1. The small energy difference between the two phases and the minimal atomic movement facilitate the single-crystal to single-crystal reversible phase transformation with no destruction of the crystal lattice. On further heating, the high-temperature phase undergoes methyl rearrangement in the solid state. 2,4,6-Trimethoxy-1,3,5-triazine (3), on the other hand, undergoes an irreversible phase transformation from single-crystal to polycrystalline material at 340 K with an enthalpy of 3.9 kJ mol−1; upon further heating it melts and methyl rearrangement takes place.

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