Shape-memory effect in PMN-PT(65/35) ceramic |
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Authors: | Pragya Pandit Vinod K Wadhawan |
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Institution: | Laser Materials Division, Centre for Advanced Technology, Indore 245013, India |
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Abstract: | We report the observation of fairly large and fully recoverable shape-memory strain in thin bars of lead magnesium niobate lead titanate ceramic for a composition (65/35) near its morphotropic phase-boundary. The recoverable shape strain produced by bending and thermal-cycling experiments is ∼0.3%, similar in magnitude to that reported for the shape-memory effect (SME) observed in some other dielectric ceramics. An explanation of the observed SME and the recoverable shape-strain is given in terms of the ferroelastic phase transitions, and the availability of a large number of competing phases and domain states near the morphotropic phase boundary in this material. The stress-induced shifting of the temperatures at which the ferroelastic phase transitions occur also plays an important role in ensuring good crystallographic reversibility around the thermal-cycling experiments. |
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Keywords: | 62 20 Fe 64 70 &minus p 83 50 &minus v 85 50 +k 77 80 Dj |
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