Phase transition - Revision history

BrianMcMahon: Tidied translations.

2017-12-14T17:04:06Z

Tidied translations.

BrianMcMahon: Tidied translations and added German and Spanish (U. Mueller)

2017-11-17T09:47:40Z

Tidied translations and added German and Spanish (U. Mueller)

BrianMcMahon: Style edits to align with printed edition

2017-05-20T09:38:45Z

Style edits to align with printed edition

MassimoNespolo: typo

2017-04-14T09:05:35Z

typo

MassimoNespolo: Created page with "Transition de phase (''Fr''); Phasenübergang (''Ge''); Cambio de estado ( ''Sp'');
2016-04-14T09:59:35Z

Created page with "Transition de phase (''Fr''); Phasenübergang (''Ge''); Cambio de estado ( ''Sp''); Transition de phase (''Fr''); Phasenübergang (''Ge''); Cambio de estado ( ''Sp''); Transizione di fase (''It''); Фазовый переход (''Ru'');相転移 ( ''Ja'').

A phase transition is the transformation of a thermodynamic system from one phase or state of matter to another one by heat transfer. The term is most commonly used to describe transitions between solid, liquid and gaseous states of matter, and, in rare cases, plasma.

Phase transitions on crystallographic interest are those involving solid phases: with the change of the external conditions (temperature, pressure, applied field) the crystal structure undergoes a change that, when it is not accompanied by a change in the chemistry, relates [[polymorphism|polymorphs]].

Phase transitions are classified on the basis of different criteria.
Mechanistic classification (Buerger): ''reconstructive'' (with changes in the pattern of chemical bonds), ''displacive'' (characterised by only small atomic shifts), ''order-disorder'' (of the atomic distribution on given Wyckoff positions).
Thermodynamic classification (Ehrenfest; Tisza): ''first-order'' (exhibit a discontinuity in the first derivative of the free energy with respect to some thermodynamic variable), ''second-order'' (continuous in the first derivative but exhibit discontinuity in a second derivative of the free energy), ''lambda'' (the heat capacity shows a kink at the transition temperature)

While reconstructive phase transitions are always first order, displacive phase transitions can be both first and second order.

[[Category: Crystal chemistry]]
[[Category: Physical properties of crystals]]

← Older revision		Revision as of 17:04, 14 December 2017
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−	<font color="blue">Transition de phase</font> (''Fr''). <font color="red">Phasenübergang, Phasenumwandlung</font> (''Ge''). <font color="black">Transizione di fase</font> (''It''). <font color="~~brown~~">~~Фазовый переход~~</font> (''Ru''). <font color="~~purple~~">~~相転移~~</font> (''Ja''). <font color="green">Cambio de estado, transición de fase</font> (''Sp'').	+	<font color="blue">Transition de phase</font> (''Fr''). <font color="red">Phasenübergang, Phasenumwandlung</font> (''Ge''). <font color="black">Transizione di fase</font> (''It''). <font color="purple">相転移</font> (''Ja''). <font color="brown">Фазовый переход</font> (''Ru''). <font color="green">Cambio de estado, transición de fase</font> (''Sp'').

← Older revision		Revision as of 09:47, 17 November 2017
Line 1:		Line 1:
−	<font color="blue">Transition de phase</font> (''Fr''). <font color="red">Phasenübergang</font> (''Ge''). <font color="~~green~~">~~Cambio de estado~~</font> (''Sp''). <font color="~~black~~">~~Transizione di fase~~</font> (''It''). <font color="~~brown~~">~~Фазовый переход~~</font> (''Ru''). <font color="~~purple~~">~~相転移~~</font> (''Ja'').	+	<font color="blue">Transition de phase</font> (''Fr''). <font color="red">Phasenübergang, Phasenumwandlung</font> (''Ge''). <font color="black">Transizione di fase</font> (''It''). <font color="brown">Фазовый переход</font> (''Ru''). <font color="purple">相転移</font> (''Ja''). <font color="green">Cambio de estado, transición de fase</font> (''Sp'').

@@ Line 1: / Line 1: @@
-<font color="blue">Transition de phase</font> (''Fr''); <font color="red">Phasenübergang</font> (''Ge''); <font color="green">Cambio de estado</font> ( ''Sp''); <font color="black">Transizione di fase</font> (''It''); <font color="brown">Фазовый переход</font> (''Ru'');<font color="purple">相転移</font> (''Ja'').
+<font color="blue">Transition de phase</font> (''Fr''). <font color="red">Phasenübergang</font> (''Ge''). <font color="green">Cambio de estado</font> (''Sp''). <font color="black">Transizione di fase</font> (''It''). <font color="brown">Фазовый переход</font> (''Ru''). <font color="purple">相転移</font> (''Ja'').
@@ Line 7: / Line 7: @@
 Phase transitions are classified on the basis of different criteria.
-*Mechanistic classification (Buerger): ''reconstructive'' (with changes in the pattern of chemical bonds), ''displacive'' (characterised by only small atomic shifts), ''order-disorder'' (of the atomic distribution on given Wyckoff positions).
+*Mechanistic classification (Buerger): ''reconstructive'' (with changes in the pattern of chemical bonds), ''displacive'' (characterized by only small atomic shifts), ''order-disorder'' (of the atomic distribution on given Wyckoff positions).
-*Thermodynamic classification (Ehrenfest; Tisza): ''first-order'' (exhibit a discontinuity in the first derivative of the free energy with respect to some thermodynamic variable), ''second-order'' (continuous in the first derivative but exhibit discontinuity in a second derivative of the free energy), ''lambda'' (the heat capacity shows a kink at the transition temperature)
+*Thermodynamic classification (Ehrenfest; Tisza): ''first-order'' (exhibit a discontinuity in the first derivative of the free energy with respect to some thermodynamic variable), ''second-order'' (continuous in the first derivative but exhibit discontinuity in a second derivative of the free energy), ''lambda'' (the heat capacity shows a kink at the transition temperature).
 While reconstructive phase transitions are always first order, displacive phase transitions can be both first and second order.

@@ Line 1: / Line 1: @@
-<font color="blue">Transition de phase</font> (''Fr''); <font color="red">Phasenübergang</font> (''Ge''); <font color="green">Cambio de estado</font> ( ''Sp''); <font color="black">Transizione di fase</font> (''It''); <font color="brown">Фазовый переход</font> (''Ru'');<font color="purple">相転移</font> ( ''Ja'').
+<font color="blue">Transition de phase</font> (''Fr''); <font color="red">Phasenübergang</font> (''Ge''); <font color="green">Cambio de estado</font> ( ''Sp''); <font color="black">Transizione di fase</font> (''It''); <font color="brown">Фазовый переход</font> (''Ru'');<font color="purple">相転移</font> (''Ja'').
 A phase transition is the transformation of a thermodynamic system from one phase or state of matter to another one by heat transfer. The term is most commonly used to describe transitions between solid, liquid and gaseous states of matter, and, in rare cases, plasma.
-Phase transitions on crystallographic interest are those involving solid phases: with the change of the external conditions (temperature, pressure, applied field) the crystal structure undergoes a change that, when it is not accompanied by a change in the chemistry, relates [[polymorphism|polymorphs]].
+Phase transitions of crystallographic interest are those involving solid phases: with the change of the external conditions (temperature, pressure, applied field) the crystal structure undergoes a change that, when it is not accompanied by a change in the chemistry, relates [[polymorphism|polymorphs]].
 Phase transitions are classified on the basis of different criteria.