Electromechanical properties of PMN-PT and PZT ceramics at cryogenic temperatures - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2010

Electromechanical properties of PMN-PT and PZT ceramics at cryogenic temperatures

Propriétés électromécaniques des céramiques PMN-PT et PZT à très basses températures

Résumé

Space borne observation requires extremely high resolution systems with large dimensions. The design of such systems implies associating sensing and actuation systems to insure a highly stable positioning of optical components. However, the currently used PZT materials for piezoelectric actuation show strongly diminished strain at cryogenic temperatures. This work explores the performances of PMN-xPT piezoelectric materials at cryogenic temperatures. Temperature dependence of PMN-xPT ceramics is compared with hard PZT (PZT-4) and soft PZT (PZT5H) ceramics from RT to 10 K. PMN-PT tetragonal compositions exhibit stable piezoelectric constant in the 250-100 K range. The highest values of piezoelectric constant are observed for PMN-38PT in the 200-50 K range. All ceramics exhibit decreasing performances versus cooling temperature. This behaviour is attributed to a "freezing out" of extrinsic contributions to piezoelectricity [12] but is also due to a contribution of quantum effects [13, 14]. The mechanical quality factor (Q m) increases very quickly from 50 K to 10 K for all samples. This fact could be due to low relaxation processes at very low temperatures.
Fichier principal
Vignette du fichier
Thiercelin_ISAF_IEEE_2010_hal_1.pdf (104.93 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03043476 , version 1 (07-12-2020)

Identifiants

Citer

Mickaël Thiercelin, Hichem Dammak, Mai Pham Thi. Electromechanical properties of PMN-PT and PZT ceramics at cryogenic temperatures. European Conference on the Applications of Polar Dielectrics (ECAPD), Aug 2010, Edinburgh, France. pp.1-4, ⟨10.1109/ISAF.2010.5712258⟩. ⟨hal-03043476⟩
37 Consultations
397 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More