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Ultra-low temperature co-fired ceramics with adjustable microwave dielectric properties in the NaO-BiO-MoO ternary system: a comprehensive study
Herein, a series of microwave dielectric materials in the Na 2 O-Bi 2 O 3 -MoO 3 ternary system, such as Na 2 MoO 4 , Na 6 Mo 10 O 33 , Na 2 Mo 2 O 7 , Bi 2 Mo 3 O 12 , Bi 2 Mo 2 O 9 , and Bi2MoO6, were studied via phase identification, microstructure characterization, spectral analysis and microwav...
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Published in: | Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-02, Vol.1 (6), p.28-216 |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | Herein, a series of microwave dielectric materials in the Na
2
O-Bi
2
O
3
-MoO
3
ternary system, such as Na
2
MoO
4
, Na
6
Mo
10
O
33
, Na
2
Mo
2
O
7
, Bi
2
Mo
3
O
12
, Bi
2
Mo
2
O
9
, and Bi2MoO6, were studied
via
phase identification, microstructure characterization, spectral analysis and microwave dielectric property tests; all the samples of each component could be sintered below 750 °C. Three different kinds of bulk ceramics,
x
(NaBi)
0.5
MoO
4
-(1−
x
)Na
2
MoO
4
(
x
= 0.2-0.6),
x
(NaBi)
0.5
MoO
4
-(1−
x
)Bi
2
MoO
6
(
x
= 0.6, 0.8) and 0.5(NaBi)
0.5
MoO
4
-0.5Bi
2
Mo
2
O
9
, were considered as the main research objects in this work. The sintering temperature of the
x
(NaBi)
0.5
MoO
4
-(1−
x
)Na
2
MoO
4
(
x
= 0.2-0.6) composite ceramics ranged from 600 °C to 640 °C; high-performance microwave dielectric properties with relative permittivities in the range of 8.9-16.2,
Q
f
(quality factor) values in the range of 11 050 GHz-8,900 GHz, and
τ
f
values ranging from −27-11 ppm °C
−1
could be obtained in these ceramics. For the
x
(NaBi)
0.5
MoO
4
-(1−
x
)Bi
2
MoO
6
(
x
= 0.6, 0.8) composite ceramics, a near-zero
τ
f
value (−2.6 ppm °C
−1
) was achieved with the 0.8(NaBi)
0.5
MoO
4
-0.
2
Bi
2
MoO
6
ceramic sintered at 720 °C with a middle-permittivity of 32.6 and a
Q
f
value of 14570 GHz. The multiphase ceramic 0.5(NaBi)
0.5
MoO
4
-0.5Bi
2
Mo
2
O
9
could be sintered at 680 °C; the dense sample had a relative permittivity of 35.7, a
Q
f
value of 9780 GHz and a small positive
τ
f
value of 17 ppm °C
−1
. As this study shows, the Na
2
O-Bi
2
O
3
-MoO
3
ternary system had a lot of new composite ceramics with low sintering temperatures and great microwave dielectric properties. All these materials could be regarded as candidates applicable to LTCC/ULTCC technology.
Na
2
O-Bi
2
O
3
-MoO
3
ternary microwave dielectric ceramics with high-performance properties have good potential in the application of LTCC/ULTCC technology. |
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ISSN: | 2050-7526 2050-7534 |
DOI: | 10.1039/d1tc05557g |