High performance films of binary system SrTiO3-PbZr0.52Ti0.48O3 on sapphire
2001 (English)In: Integrated Ferroelectrics, ISSN 1058-4587, Vol. 39, no 1-4, 351-358 p.Article in journal (Refereed) Published
Continuous series of solid solutions x.SrTiO3-(1-x).PbZr0.52Ti0.48O3 (SPZT) have been grown by pulsed laser deposition technique onto La0.7Sr0.3CoO3/Al2O3(01 (1) under bar2) single crystal. Films properties have been characterized in Au/SPZT/La0.7Sr0.3CoO3(LSCO)/Al2O3 vertical capacitive cell. X-ray diffraction shows SPZT/LSCO bilayer grows in strict epitaxial relationship with sapphire substrate: (001) SPZT parallel to (001) LSCO parallel to (01 (1) under bar2) Al2O3;  SPZT parallel to  LSCO parallel to  Al2O3. LSCO layer was found to be tensile strained, while SPZT film experiences tetragonal distortions c/a -1 approximate to 0.86% which are much lower than 2.73% in pure PZT ceramics. Curie temperature in SPZT film has been tailored continuously in the explored temperature range 77 K to 400 K by controlling SrTiO3:PZT ratio. Processing parameters have been optimized to get the highest tunability factor K = epsilon'(0) - epsilon'(V)/epsilon'(0) x 1/tandelta . SrTiO3:PZT=83:17 film exhibits superior properties: at I kHz maximum dielectric perinittivity and minimum loss tandelta were found to be 870 and 0.005, respectively; while K-factor exceeds value of 60 in the temperature range 280 to 350 degreesC reaching the maximum value of 64 at 325 degreesC. SPZT films can withstand prolonged pre-breakdown electric field and has resistivity as high as 3.5 10(12) Omega cm at 186 kV/cm.
Place, publisher, year, edition, pages
2001. Vol. 39, no 1-4, 351-358 p.
epitaxial films, tailoring ferroelectricity by alloying, low loss, voltage tunability, thin-films
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-21226DOI: 10.1080/10584580108011958ISI: 000173066800038OAI: oai:DiVA.org:kth-21226DiVA: diva2:339924
QC 201005252010-08-102010-08-102010-10-15Bibliographically approved