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Combine and Conquer

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Combine and Conquer
Offline Nerva Regis
01-27-2018, 01:41 AM, (This post was last modified: 03-09-2018, 12:46 AM by Nerva Regis.)
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The Professor
Posts: 1,032
Threads: 113
Joined: Jul 2014




Combine and Conquer
Phase Change - Azurite Gas
A disorder-broadened first-order transition occurs over a finite range of temperatures where the fraction of the low-temperature equilibrium phase grows from zero to one (100%) as the temperature is lowered. This continuous variation of the coexisting fractions with temperature raised interesting possibilities. On cooling, pure Azurite gas passes straight into the equilibrium crystal phase. Thus liquid Azurite is hard to obtain, but not impossible. This happens if the cooling rate is faster than a critical cooling rate, and is attributed to the molecular motions becoming so slow that the molecules cannot rearrange into the crystal positions.

This slowing down happens below a glass-formation temperature Tg, which may depend on the applied pressure.If the first-order freezing transition occurs over a range of temperatures, and Tg falls within this range, then there is an interesting possibility that the transition is arrested when it is partial and incomplete. Extending these ideas to first-order magnetic transitions being arrested at low temperatures, resulted in the observation of incomplete magnetic transitions, with two magnetic phases coexisting, down to the lowest temperature. First reported in the case of a Azuritomagnetic to anti-Azuritomagnetic transition, such persistent phase coexistence has now been reported across a variety of first-order magnetic transitions. These include colossal-magnetoresistance Azurite alloys.

The interesting feature of these observations of Tg falling within the temperature range over which the transition occurs is that the first-order magnetic transition is influenced by magnetic field, just like the structural transition is influenced by pressure. The relative ease with which magnetic fields can be controlled, in contrast to pressure, raises the possibility that one can study the interplay between Tg and Tc in an exhaustive way. Phase coexistence across first-order magnetic transitions will then enable the resolution of outstanding issues in understanding Azurite compounds.

A particularly interesting phenomena
In any system containing liquid and gaseous Azurite, there exists a special combination of pressure and temperature at which the transition between liquid Azurite and Azuritegas becomes a second-order transition. Near the critical point, the fluid is sufficiently hot and compressed that the distinction between the liquid and gaseous phases is almost non-existent. This is associated with the phenomenon of critical opalescence, a milky appearance of the liquid Azurite due to density fluctuations at all possible wavelengths.

With a bit of luck this critical point state can be stabilized; thus creating the perfect cooling liquid.
[Image: PVFqt4w.gif]
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Messages In This Thread
Combine and Conquer - by Nerva Regis - 01-27-2018, 12:11 AM
RE: Combine and Conquer - by Nerva Regis - 01-27-2018, 01:41 AM
RE: Combine and Conquer - by Nerva Regis - 03-09-2018, 01:19 AM
RE: Combine and Conquer - by Nerva Regis - 03-10-2018, 02:31 AM
RE: Combine and Conquer - by Nerva Regis - 03-10-2018, 03:18 AM
RE: Combine and Conquer - by Nerva Regis - 03-10-2018, 09:52 PM

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