NDLI: Densification and dielectric properties of SrO–Al$_{2}$O$_{3}$–B$_{2}$O$

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Densification and dielectric properties of SrO–Al$_{2}$O$_{3}$–B$_{2}$O$_{3}$ ceramic bodies

Content Provider	Springer Nature Link
Author	AZIZ, DOAA A ABDEL AHMED, SHAMA E
Copyright Year	2011
Abstract	The influence of SrO (0·0–5·0 wt%) on partial substitution of alpha alumina (corundum) in ceramic composition (95 Al$_{2}$O$_{3}$–5B$_{2}$O$_{3}$) have been studied by co-precipitated process and their phase composition, microstructure, microchemistry and microwave dielectric properties were studied. Phase composition was revealed by XRD, while microstructure and microchemistry were investigated by electron-probe microanalysis (EPMA). The dielectric properties by means of dielectric constant (ε $_{ r }$), quality factor (Q × f) and temperature coefficient of resonant frequency (τ $_{ f }$) were measured in the microwave frequency region using a network analyser by the resonance method. The addition of B$_{2}$O$_{3}$ and SrO significantly reduced the sintering temperature of alumina ceramic bodies to 1600 °C with optimum density (∼ 4g/cm$^{3}$) as compared with pure alumina powders recycled from Al dross (3·55g/cm$^{3}$ sintered at 1700 °C).The sintered ceramic bodies show different ranges for the dielectric properties. Dielectric constant exists between 24 and 29, quality factor (Q × f) is ranging between 15,236 and 22,020 GHz with a slight increase than those recorded with commercial alumina (10,000 – 20,000 GHz) and temperature coefficient of resonant frequency (τ $_{ f }$) in the –69 to –83 ppm/°C range. The addition of SrO up to 5wt% leads to a maximum (ε $_{ r }$) value (29) due to relatively higher ionic polarizability of Sr$^{2 + }$ than that of the Al$^{3 + }$ and B$^{3 + }$ ions. On the other hand, changing chemical and phase composition with the formation of platelets of Sr-hexaluminate phase (SrAl$_{12}$O$_{19}$) results in maximizing value of (Q × f) up to 22,020 GHz at ≈ 8 GHz and large negative charge of (τ $_{ f }$) to –83 ppm/°C.
Starting Page	143
Ending Page	148
Page Count	6
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	34
Issue Number	1
e-ISSN	09737669
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-13
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceramic; microwave; SrO; alpha alumina; B$_{2}$O$_{3}$; dielectric properties. Materials Science Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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