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The lattice vibration and microwave dielectric properties of BaZnP 2− x Nb x O 7 ceramics for microwave substrates
Ist Teil von
Journal of the American Ceramic Society, 2022-12, Vol.105 (12), p.7455-7466
Erscheinungsjahr
2022
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
Abstract
The BaZnP
2−
x
Nb
x
O
7
microwave dielectric ceramics were prepared by solid‐state reaction method to investigate the impact of Nb
5+
on the composition, microstructure, and vibrational properties, as well as sintering characteristics and microwave dielectric properties. The solubility of Nb
5+
in the BaZnP
2−
x
Nb
x
O
7
lattice was limited. A moderate amount of Nb
5+
substitution could promote the densification process. The vibrational characteristics of the BaZnP
2
O
7
ceramics were first studied by performing experimental and theoretical Raman and infrared spectroscopy measurements in this work, and their relationship with the microwave dielectric properties was studied. The acquired results showed that (Ⅰ)
ε
r
was influenced by both the density and the second phase; (Ⅱ) the density and full width at half maximum of the Raman vibrational peak played a critical role in affecting the
Q × f
values. The BaZnP
2−
x
Nb
x
O
7
samples sintered at 925°C exhibited the outstanding microwave dielectric properties with
x
= 0.02:
ε
r
= 7.98,
Q × f
= 60 615 GHz (tan
δ
= 2.18 × 10
−4
;
f
= 13.21 GHz) and
τ
f
= −52.93 ppm/°C (
ρ
bulk
= 4.03 g/cm
3
;
ρ
r
= 92.69%). The proposed ceramic is expected to be used in microwave substrates.
Sprache
Englisch
Identifikatoren
ISSN: 0002-7820
eISSN: 1551-2916
DOI: 10.1111/jace.18695
Titel-ID: cdi_crossref_primary_10_1111_jace_18695
Format
–
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