Pulsed Laser Deposited KTN Thin Films for Microwave Applications

Anthony Rousseau 1 Maryline Guilloux-Viry 1 André Perrin 1 Vincent Laur 2 Gérard Tanné 2 Paul Laurent 2 Fabrice Huret 2
1 ISCR - Institut des Sciences Chimiques de Rennes
2 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)
Abstract : Ferroelectric thin films are attractive materials for electrically tunable high frequency devices, via the variation of the dielectric permittivity driven by a dc voltage. Devices performances strongly depend on the ferroelectrics characteristics: Curie Temperature (Tc) which determines the use in the paraelectric or ferroelectric phase, permittivity , and losses. Integration of such materials implies the control of high quality thin films on substrates suitable for microwaves range. In this frame we investigated KTaxNb1-xO3 (KTN) compound which gives access to various Tc according to x, together with quite low losses. Thin films were epitaxially grown on MgO and LaAlO3 single crystals, as evidenced by x-ray diffraction (XRD). Influence of deposition parameters on thin films composition, orientation and microstructure will be discussed. Although films were epitaxially grown on both substrate a higher crystalline quality was achieved on LaAlO3 because of the better lattice mismatch: XRD rocking curves lin the range 0.5-0.8° were recorded on KTN films on LaAlO3, and around 1.2° on MgO. The response of gold interdigited capacitors realized by screen printing and patterning on KTN films grown on MgO versus an applied dc bias illustrates the potentiality of these compounds for microwaves frequency agility.
Keywords : Thin Films Microwave Agility Ferroelectrics
Type de document :
Communication dans un congrès
European Material Research Society Spring Meeting, May 2005, Strasbourg, France
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http://hal.univ-brest.fr/hal-00483905
Contributeur : Vincent Laur <>
Soumis le : lundi 17 mai 2010 - 14:40:10
Dernière modification le : vendredi 25 mai 2018 - 01:26:08

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  • HAL Id : hal-00483905, version 1

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LAB-STICC_UBO | UNIV-BREST | ISCR | ISCR-CSM | LAB-STICC | INC-CNRS | UR1-UFR-SPM | UNIV-RENNES | SCR-MI-INSA

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Anthony Rousseau, Maryline Guilloux-Viry, André Perrin, Vincent Laur, Gérard Tanné, et al.. Pulsed Laser Deposited KTN Thin Films for Microwave Applications. European Material Research Society Spring Meeting, May 2005, Strasbourg, France. 〈hal-00483905〉

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