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  • ceramic thick-film  (1)
  • strontium titanate  (1)
  • 1
    ISSN: 1573-8663
    Keywords: barium titanate ; strontium titanate ; tunable dielectrics ; interdigital capacitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The voltage dependence of the dielectric constant of ferroelectricmaterials makes them attractive for use as tuning elements in microwavecircuits. In this study, capacitance tuning and loss measurements wereperformed on ferroelectric materials prepared by the sol-gel process and RFmagnetron sputtering. We find that Pb(Zr,Ti)O3 (PZT) thinfilms with interdigital electrodes can be fabricated with reasonably lowloss to make them useful for room temperature tuning applications. Inaddition, it is found that high temperature post-deposition annealing ofboth sputtered SrTiO3 (ST) and sol-gel derivedBaTiO3 (BT) films markedly improves their tuning and lossfactor characteristics. By annealing the samples in the range of1000–1100°C, the tunability was increased by as much as a factorof seven, while the dissipation factors were decreased to values of0.3–0.5%. In addition, it is shown that the permittivity of thefilms in these interdigitated capacitor structures can be calculated usingan analytical model previously described by Farnell et al. [1].
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of electroceramics 3 (1999), S. 173-178 
    ISSN: 1573-8663
    Keywords: direct fabrication ; micropen ; polymer ; thick-film ; ceramic thick-film ; multilayer ; rheology ; MMICCs ; passive components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The need for advanced electronic ceramic components with smaller size, greater functionality and enhanced reliability requires the ability to integrate electronic ceramics in complex 3-D architectures. However, traditional tape casting and screen printing approaches are poorly suited to the requirements of rapid prototyping and small-lot manufacturing. To address this need, a direct-write approach for fabricating highly integrated, multilayer components using a Micropen to deposit slurries in precise patterns is being developed at Sandia. This approach provides the ability to fabricate multifunctional, multimaterial integrated ceramic components (MMICCs) in an agile and rapid way. Commercial ceramic thick-film pastes can be used directly in the system, as can polymer thick-film pastes (PTF). The quality of printed components depends on both the rheology and drying behavior of the pastes. Pastes with highly volatile solvents are inappropriate for the Micropen. This system has been used to make integrated passive devices such as RC filters, inductors, and voltage transformers.
    Type of Medium: Electronic Resource
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