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Advanced dielectrics: Bulk ceramics and thin films

Authors

  • Dr. Detlev Hennings,

    1. Philips Research Laboratory Weisshausstrasse, W-5100 Aachen (FRG)
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    • Studied inorganic chemistry and received his Ph.D. in physical chemistry in 1967 from the University of Saarbrücken, FRG. He then joined the Electronic Ceramics Group of the Philips Research Laboratory in Aachen where he is working as senior scientist in the field of materials preparation and characterization of functional ceramics used in capacitors, nonlinear resistors (PTC, VDR), and piezoelectric and pyroelectric devices.

  • Dr. Mareike Klee,

    1. Philips Research Laboratory Weisshausstrasse, W-5100 Aachen (FRG)
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    • (née Jakowski) studied chesmistry at the TH Darmstadt. She received her Ph.D. in the field of inorganic-structure and solid-state chemistry in 1984 and then joined the Electronic Ceramics Group of the Philips Research Laboratory Aachen. She has investigated advanced powder-preparation techniques and thin-film processes for dielectric and high-T, superconducting materials. At present, she is in charge of the chemical activities concerning ferroelectric thin films for applicatons such as nonvolatile memories.

  • Dr. Rainer Waser

    1. Philips Research Laboratory Weisshausstrasse, W-5100 Aachen (FRG)
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    • Studied physical chemistry at the TH Darmstadt. He received his Ph.D. in the field of electrochemistry in 1984 and joined the Electronic Ceramics Group of the Philips Research Laboratory in Aachen. He is in charge of investigations concerning the quality and the long-term reliability of dielectric materials and devices. In 1988, he was awarded the Carl Wagner Prize by the Max Planck Institute in Göttingen, in recognition of his research work on the proton defect chemistry in titanates and in 1990 the John D. Moyuihan Prize for the best overall paper presented at the CARTS conference in Amsterdam (1990).


  • We are indebted to D. Bausen, W. Brand, B. Krafczyk and G. Rosenstein for carrying out the X-ray diffraction and electron microscopy analyses.

Abstract

Review: Ceramic multilayer capacitors used in surface-mount electronics have decreased in size by a factor of four over the last five years while their capacitance per unit volume has increased by the same factor. The preparation and processing procedures applied to ultrafine dielectric ceramic powders used in the capacitors (see Figure), which have resulted in these improvements in size and performance characteristics are described.

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