منابع مشابه
Boron under Pressure: Phase Diagram and Novel High-pressure Phase
Boron has a unique chemistry, responsible for remarkable complexities even in the pure element. I review some of the history of the discovery of this element, and recent surprises found in boron under pressure. I discuss the recent discovery of a new high-pressure phase, γ-B28, consisting of icosahedral B12 clusters and B2 pairs in a NaCl-type arrangement: (B2)(B12), and displaying a significan...
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Understanding the polymorphic behavior of active pharmaceutical ingredients is important for formulation purposes and regulatory reasons. Metacetamol is an isomer of paracetamol and it similarly exhibits polymorphism. In the present article, it has been found that one of the polymorphs of metacetamol is only stable under increased pressure, which has led to the conclusion that metacetamol like ...
متن کاملThe pressure-temperature phase diagram of hen lysozyme at low pH
The equilibrium unfolding of hen lysozyme at pH 2 was studied as a function of pressure (0.1~700MPa) and temperature (-10°C~50°C) using Trp fluorescence as monitor supplemented by variable pressure 1H NMR spectroscopy (0.1~400MPa). The unfolding profiles monitored by the two methods allowed the two-state equilibrium analysis between the folded (N) and unfolded (U) conformers. The free energy di...
متن کاملThe phase diagram of high-pressure superionic ice
Superionic ice is a special group of ice phases at high temperature and pressure, which may exist in ice-rich planets and exoplanets. In superionic ice liquid hydrogen coexists with a crystalline oxygen sublattice. At high pressures, the properties of superionic ice are largely unknown. Here we report evidence that from 280 GPa to 1.3 TPa, there are several competing phases within the close-pac...
متن کاملTemperature-pressure phase diagram of deuterated tetramethylammonium tetrachlorozincate
2014 The pressure temperature phase diagram has been obtained in the deuterated TMATC-Zn by measuring the modulation wave vector in the range 0 to 1.8 kbar and 2014 5 to 36 °C. This diagram is a nice illustration of the devil’s staircase. It exhibits various commensurate stairs with k = 1/3,2/5 in the ferroelectric phase, 3/7 and 1/2. At high temperatures lock-in occurs at 2/5. This phase separ...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2011
ISSN: 1742-6596
DOI: 10.1088/1742-6596/273/1/012009