PIRA 4C45.00 PHASE CHANGES: SOLID-SOLID

DCS #DEMONSTRATIONREFERENCEABSTRACT
4C45.00Phase Changes: Solid - Solid
4C45.10phase change in ironPIRA 1000
4C45.10phase change in iron4C45.10
4C45.10phase change in ironEs-7A long iron wire heated to 1000 K will sag as it goes through a phase change.
4C45.20solid-solid phase projectionAJP 43(7),650The salt ammonium nitrate exhibits five phase transitions between 169 C and -16C. Heat the salt on a microscope slide with an electrically conducting coating on one side.
4C45.30polymorphismPIRA 1000
4C45.31polymorphism26-5.18Mercury iodide changes from red to yellow at 126 C. Ammonium nitrate has five solid phases at -16, 35, 83, 125 C - best demonstrated between crossed Polaroids on the overhead projector.
4C45.35phase transitions - magnetic modelAJP 59(3),260A magnetic model demonstrates phase transitions and excitations in molecular crystals. Construction details and hints included along with theory.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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