Topotactic reversible phase transition between room-temperature and a new low-temperature modification in the MCl3(THF)3 system

1997 ◽  
Vol 8 (4) ◽  
pp. 237-243 ◽  
Author(s):  
Ulli Englert ◽  
Fausto Calderazzo ◽  
Guido Pampaloni
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Room Temperature ◽  
Temperature Modification ◽  
Reversible Phase Transition ◽  
Reversible Phase

scholarly journals The low-temperature triclinic crystal structure of silver 3-sulfobenzoic acid

2020 ◽  
Vol 76 (8) ◽  
pp. 1275-1278
Author(s):  
Reuben T. Bettinger ◽  
Philip J. Squattrito ◽  
Darpandeep Aulakh
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Low Temperature ◽  
Room Temperature ◽  
Monoclinic Structure ◽  
Structure Space ◽  
Reversible Phase Transition ◽  
Triclinic Structure ◽  
Reversible Phase ◽  
Acidic Hydrogen

Poly[(μ4-3-carboxybenzenesulfonato)silver(I)], Ag(O3SC6H4CO2H) or [Ag(C7H5O5S)] n , has been found to undergo a reversible phase transition from monoclinic to triclinic between 160 and 150 K. The low-temperature triclinic structure (space group P\overline{1}) has been determined at 100 K. In contrast to the reported room temperature monoclinic structure, in which the nearly equivalent carboxylate C—O distances indicate that the acidic hydrogen is randomly distributed between the O atoms, at 100 K the C—O (protonated) and C=O (unprotonated) bonds are clearly resolved, resulting in the reduction in symmetry from C2/c to P\overline{1}.

Reversible phase transition between amorphous and crystalline in Zr41.2Ti13.8Cu12.5Ni10Be22.5 under high pressure at room temperature

2000 ◽  
Vol 76 (20) ◽  
pp. 2874-2876 ◽  
Author(s):  
Liling Sun ◽  
W. K. Wang ◽  
D. W. He ◽  
W. H. Wang ◽  
Q. Wu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Room Temperature ◽  
Reversible Phase Transition ◽  
Reversible Phase

A low temperature reversible phase transition for 1,1'-bis-(ferrocenyldimethylsilyl)ferrocenylene, (η5-FcSiMe2C5H4)2Fe, an oligomeric model for silyleneferrocenylene polymers

2000 ◽  
Vol 78 (11) ◽  
pp. 1511-1518 ◽  
Author(s):  
Mikhail Yu Antipin ◽  
Ivan I Vorontsov ◽  
Irene I Dubovik ◽  
Vladimir Papkov ◽  
Francisco Cervantes-Lee ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Phase Space ◽  
Low Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Space Group ◽  
Reversible Phase Transition ◽  
Reversible Phase

We have reinvestigated the solid state structure of 1,1'-bis-(ferrocenyldimethylsilyl)ferrocenylene, (η5-FcSiMe2C5H4)2Fe, Fc = (η5-C5H5)Fe(η5-C5H4). Using a DSC technique we observed a reversible phase transition for this compound at 169(3)K with ΔH = 1.1 kJ/mol, and ΔS = 6.54 J/mol K. A single crystal X-ray diffraction study has demonstrated that this phase change involves a transformation from a high temperature phase, space group P21/c, Z = 2, to a triclinic low temperature phase, space group P[Formula: see text], Z = 4. The phase transition involves the loss of the molecular crystallographic center of symmetry and rotations about the terminal and central cyclopentadienyl ring pairs. The results are compared to those reported for ferrocene.Key words: solid state, phase transition, silyleneferrocenylene.

A room temperature reversible phase transition containing dielectric switching of a host–guest supramolecular metal–halide compound

2017 ◽  
Vol 46 (38) ◽  
pp. 12760-12765 ◽  
Author(s):  
Yang Lu ◽  
Xiu-Ni Hua ◽  
Wei-Qiang Liao ◽  
Ji-Xing Gao ◽  
Zi Yin
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Metal Halide ◽  
Reversible Phase Transition ◽  
Reversible Phase

A host–guest supramolecular metal–halide compound undergoes a reversible phase transition, accompanied by distinct dielectric switching.

Nature of the √3α to 3 × 3 reversible phase transition at low temperature in Sn/Ge (111)

2001 ◽  
Vol 175-176 ◽  
pp. 201-206 ◽  
Author(s):  
G Le Lay ◽  
M Goshtasbi Rad ◽  
M Göthelid ◽  
U.O Karlsson ◽  
J Avila ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Reversible Phase Transition ◽  
Reversible Phase

Survival of mouse blastocysts after low-temperature preservation under high pressure

2004 ◽  
Vol 52 (4) ◽  
pp. 479-487 ◽  
Author(s):  
Cs. Pribenszky ◽  
M. Molnár ◽  
S. Cseh ◽  
L. Solti
Keyword(s):  
Phase Transition ◽  
Hydrostatic Pressure ◽  
Low Temperature ◽  
High Hydrostatic Pressure ◽  
Room Temperature ◽  
Freezing Point ◽  
Significant Loss ◽  
Embryo Cryopreservation ◽  
Subzero Temperatures ◽  
Survival Capacity

Cryoinjuries are almost inevitable during the freezing of embryos. The present study examines the possibility of using high hydrostatic pressure to reduce substantially the freezing point of the embryo-holding solution, in order to preserve embryos at subzero temperatures, thus avoiding all the disadvantages of freezing. The pressure of 210 MPa lowers the phase transition temperature of water to -21°C. According to the results of this study, embryos can survive in high hydrostatic pressure environment at room temperature; the time embryos spend under pressure without significant loss in their survival could be lengthened by gradual decompression. Pressurisation at 0°C significantly reduced the survival capacity of the embryos; gradual decompression had no beneficial effect on survival at that stage. Based on the findings, the use of the phenomena is not applicable in this form, since pressure and low temperature together proved to be lethal to the embryos in these experiments. The application of hydrostatic pressure in embryo cryopreservation requires more detailed research, although the experience gained in this study can be applied usefully in different circumstances.

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