Abstract
Results of experiments on application of various interlayers between LTCC (Low Temperature Cofired Ceramics) substrate and thick-film PZT (Lead Zirconate - Titanate) are described in this work. Thick-film intermediate layers were based on several dielectric materials: TiN, Al 2 O 3 , SiC, TiO 2 , SiC, YSZ, BN. Seven screen printable pastes were prepared on the base of powders of mentioned materials with addition of glass and organic vehicle. The substrates were made of 951 (DuPont), CeramTapeGC (CeramTec) and HL2000 (Heraeus) LTCC tapes. Sandwich type transducers, consisting of barrier layer, gold bottom electrode, PZT layer and silver top electrode were prepared and characterized. Basic piezoelectric parameters – permittivity, effective charge constant ( d 33(eff) ) and remanent polarization were determined. The best properties were obtained for substrates made of 951. In general, interlayers based on TiO 2 , SiC and Al 2 O 3 improved permittivity and charge constant comparing to bare substrates. For example, for 951 substrate the PZT layer exhibited d 33(eff) equal to 160, 215, 250 and 230 pC/N for bare substrate, TiO 2 interlayer, SiC interlayer and Al 2 O 3 interlayer, respectively. In case of CeramTape GC substrates determined permittivity was equal to 215, 245, 235 and 275 for bare substrate, TiO 2 interlayer, SiC interlayer and Al 2 O 3 interlayer, respectively. In case of TiN and BN materials the parameters were considerably deteriorated.
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