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Erschienen in:
12.03.2016
Phase composition and microstructure of A n M n O3n+2 (n = 4.5 and 5) microwave ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2016
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Abstract
A
n
M
n
O3n+2 (n = 4.5 and 5; A = Na, Ca, La; M = Ti, Nb, Mg, Zn) ceramics were processed via a mixed oxide solid state sintering route. X-ray diffraction analysis revealed the formation of biphase/multiphase ceramics for all the investigated compositions. The microstructure of sintered ceramics comprised closely packed grains/elongated rods. Dielectric constant (k) was in the range 33–47, quality factor (Q × f
o) in the range 7898–21,408 GHz and temperature coefficient of resonance frequency (TCF) in the range −5 to −104 ppm/K. Although, the highest k ~ 47 and Q × f
o ~ 19,070 GHz were observed for La9Ti8(Mg2/3Nb1/3)O31 but the optimum microwave dielectric properties (k ~ 44, Q × f
o ~ 7898 GHz and TCF ~ −5 ppm/K) were achieved for La9Ti8ZnO31.