Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Teaching & Learning Packages Pyroelectric Materials Example Pyroelectric Materials
Pyroelectric Materials AimsBefore you startIntroductionPolarisationVariation of Polarisation with TemperatureBehaviour around the Curie pointThe Direct and Indirect EffectExample Pyroelectric MaterialsTriglycine sulphatePolyvinylidene fluorideApplication of a Pyroelectric-Infrared detectionPollutant ControlSummaryQuestionsGoing further
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Example Pyroelectric Materials

Like other dielectric materials, the predominant pyroelectric structure is the perovskite.

Two examples are:
0.75Pb(Mg1/3-Nb2/3)O3-0.25PbTiO3, which has a pyroelectric coefficient of −1300 μC m−2 K−1 as a single crystal.

It is more commonly referred to as PMN-PT.

Rotating crystal structure of PbMg/NbO3


and

Ba0.65Sr0.35TiO3, which has a pyroelectric coefficient of −7570 μC m−2 K−1.

It is also known as BST.

Rotating crystal structure of Ba/SrTiO3

However, there are other types of pyroelectric material which do not have a perovskite structure. Two of the more common of these will also be considered.

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