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Investigation of microwave and electrical characteristics of Co-Zr substituted M-type Ba-Sr hexagonal ferrite

100%

Singh L. , Malhotra J. , Singh C. , Narang S. B. , Chandra M.

tom Vol. 33, No. 2

335--339

Microwave characteristics of M-type hexagonal ferrite, Ba-0.Sr-5(0).5CoxZrxFe(12-2x) O-19 (x = 0.0 to 1.0 in steps of 0.2), have been investigated as a function of frequency and substitution at X-band. The microwave absorption has been investigated using absorber testing device method. The static I-V characteristics have been studied as a function of substitution. The results show maximum microwave absorption at higher substitution. The static current exhibits ohmic behavior from 0 to 3 V and exponential trend from 3 to 4.8 V. The microstructure influences both microwave and electrical properties. The ferrite compositions for different electromagnetic applications are also suggested by measuring the microwave absorbed, transmitted and reflected power.

Preparation and properties of low temperature sintered CaO-B2O3-SiO2 microwave dielectric ceramics using the solid-state reaction

88%

Zhou X. , Li E. , Yang S. , Li B. , Tang B. , Yuan Y. , Zhang S.

Materials Science Poland

2013

tom Vol. 31, No. 3

404--409

The LTCC CaO–B2O3–SiO2 (CBS) ceramics were synthesized via solid-state reaction process without any sintering aid. The effects of different sintering temperatures and B2O3 content on the microwave and mechanical properties were investigated. The results show that the best sintering temperature is around 950 °C and increasing amount of B2O3 promotes the crystallization of CaB2O4 enhancing the flexure strength of the CBS ceramics. However, the dielectric and mechanical properties deteriorated rapidly while the amount of B2O3 exceeded 25 wt.%. The sample with 20.5 wt.% B2O3 sintered at 950 °C had the best properties with er = 6.06; tand = 0.0015 (1 MHz) and a high flexure strength qf > 180 MPa.