In:
International Journal of Applied Ceramic Technology, Wiley, Vol. 19, No. 4 ( 2022-07), p. 2064-2072
Abstract:
Structural evolution and microwave dielectric properties of LiNb 0.6 (Ti 1‐x [Co 1/3 Nb 2/3 ] x ) 0.5 O 3 (.05≤x≤.2) ceramics have been studied in this paper. Although the doped compositions maintain the M‐phase solid solutions, compositional fluctuation due to nonuniform dispersion of minor dopants could be observed as x 〈 .05, and trace amount of Li 2 TiO 3 ‐based solid solution (Li 2 TiO 3 ss) secondary phase presents in the x 〉 .05 compositions. The microwave dielectric properties could be remarkably improved by the doping of (Co 1/2 Nb 1/2 ) 4+ in comparison to the undoped counterpart. Optimized microwave dielectric properties with Q × f = ∼6500 GHz, ε r = ∼74 and τ f = +8.2 ppm/°C could be obtained at x = .10 after sintering at 1050°C/2 h. The sintering temperature could be further reduced to 900°C/2 h by adding .2 wt% B 2 O 3 without affecting significantly its microwave dielectric properties: ε r = 73, Q × f = 6000 GHz, τ f = +8.5 ppm/°C. The LiNb 0.6 (Ti 1‐x [Co 1/3 Nb 2/3 ] x ) 0.5 O 3 ceramics obtained in this case exhibit large dielectric permittivity coupled with much improved Q × f values, near zero τ f , and low sintering temperature simultaneously, which makes it a promising high‐k microwave dielectric material for low temperature cofired ceramic applications.
Type of Medium:
Online Resource
ISSN:
1546-542X
,
1744-7402
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2167226-X
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