The mixed metal perovskite Pb0.76La0.04Bi0.20VO3 displays Negative Thermal Expansion (NTE) as illustrated.

(a) Explain, using appropriate diagrams, why the observed NTE is unlikely to be related to a Rigid Unit Mode. (4 marks)

(b) What conclusions can be made from the observed hysteresis in the NTE? (3 marks)

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30 20 10 아 200 300 400 500 Temperature (K) ALIL460 K (10°) 30 20 10 아 200 300 400 500 Temperature (K) ALIL460 K (10°)

Answer rating: 100% (QA)

solution Negative thermal expansion NTE Materials which are contracted upon heating rather than expa... View the full answer