Fig. 3. Diagram showing phase transitions of CRT phase that occur on heating and subsequent thermal cycling. The labels 21P and AGT denote the 21-layer TAGS-85 polymorph (see main text for details) and an Ag8GeTe6 impurity phase, respectively. Solid horizontal lines indicate phase transition temperatures determined within an uncertainty of ±10 °C and dotted horizontal lines indicate phase transition temperatures with a larger uncertainty than ±10 °C due to lack of data. These horizontal lines are color-coded: red = transition on initial heating only; black = transition on subsequent heating and cooling cycles.
