Crystalliser horizontal

P and a represent, respectively, the undercooled liquid, the b.c.c. solid solution and the amorphous phase. ( ) are results from enthalpy of crystallisation experiments. Horizontal bars represent amorphous phase (I) interdifliision reaction and (2) by laser-quenching. 

That is when the liquid round the thermometer has reached the temperature of solidification, the heat lost to the bath is balanced by heat evolved on crystallisation, and the horizontal part of the curve results Before the mass has, however, becoipe entirely solid, a change sets in, because the thermometer comes more and more in contact with the solid substance, which m so far as the bulb is not in direct contact with the liquid will possess a lower temperature than the liquid, and will produce m its readings the rounding at C, until the last trace of liquid has vanished If the heterogeneous equilibrium, 1 e the transformation of solid into liquid at constant temperature, is not established with very great rapidity,... 

Nonadecane undergoes a phase transition at 295.2 K from an ordered solid state to a Ri "rotator" phase. In the low temperature crystalline state, C19H40 crystallises in an orthorhombic layered structure composed of molecules parallel to each other and in their "all trans" conformation. One can distinguish, in a horizontal section of the layers, two sub-lattices A and B according to two different orientations of the chains, about 85° apart. The a/b ratio of the lattice parameters increases markedly in the Ri phase and tends to the "hexagonal" value V3, only reached in the Rn phase of longer chain compounds. ... 

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