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Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 56: Focused Session on GHz Dielectrics: Materials for Mobile Communication II (jointly with HL, MM, DY)

MM 56.2: Vortrag

Donnerstag, 19. März 2015, 15:30–15:50, EB 407

Titanate-based paraelectric glass-ceramics for applications in GHz electronics — •Hubertus Braun1,2,3, Martin Letz2, Martun Hovhannisyan2, and Hans-Joachim Elmers11Johannes-Gutenberg Universität Mainz — 2SCHOTT AG, Mainz — 3Graduate School Materials Science in Mainz

In the current work, titanate-based glass-ceramics (TiO2 > 45 mol %) in the La2O3-TiO2-SiO2-B2O3 system are developed (εr ≈ 20-30, Qf ≈ 10.000 GHz, |τf| < 10 ppm/K) which show promising properties as microwave materials and offer numerous advantages in comparison to conventional sintered ceramics. Glass-ceramics which are obtained via a true glassy phase are comparatively new in this field and will be presented as suitable alternative. Glass-ceramics are produced in a two step process: At first, a basic glass is casted in a conventional glass production process. Then the glass undergoes a temperature treatment with a defined temperature profile to initiate a controlled partial crystallization of desired paraelectric phases inside the glassy matrix. Obtaining materials via a homogeneous glassy phase enables intrinsically pore-free materials with comparatively superior surface properties. The effect of solid solution type doping on the dielectric properties and glass stability is investigated. The effect of solid solution type doping on the A(La) and B(Ti) site of the crystalline phases with ions of similar ionic radius is investigated concerning their influence on the dielectric properties and glass stability. Further the materials are analyzed concerning suitability for dielectric loaded antenna applications.

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