J. Mater. Sci. Technol. ›› 2020, Vol. 47: 216-222.DOI: 10.1016/j.jmst.2020.02.015
• Research Article • Previous Articles Next Articles
Heng Chena,b, Biao Zhaoc, Zifan Zhaoa, Huimin Xianga, Fu-Zhi Daia, Jiachen Liub, Yanchun Zhoua,b,*()
Received:
2020-01-20
Revised:
2020-02-05
Accepted:
2020-02-17
Published:
2020-06-15
Online:
2020-06-24
Contact:
Yanchun Zhou
Heng Chen, Biao Zhao, Zifan Zhao, Huimin Xiang, Fu-Zhi Dai, Jiachen Liu, Yanchun Zhou. Achieving strong microwave absorption capability and wide absorption bandwidth through a combination of high entropy rare earth silicide carbides/rare earth oxides[J]. J. Mater. Sci. Technol., 2020, 47: 216-222.
Compounds | Lattice parameters | d (g/cm3) | ||
---|---|---|---|---|
a (?) | b (?) | c (?) | ||
(Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)3Si2C2 | 3.848 | 15.638 | 4.220 | 6.83 |
(Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)3Si2C2 | 3.872 | 15.784 | 4.262 | 6.51 |
(Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)3Si2C2 | 3.873 | 15.803 | 4.263 | 6.47 |
Y3Si2C2 | 3.845 | 15.636 | 4.214 | 4.54 |
Gd3Si2C2 | 3.885 | 15.866 | 4.274 | 6.95 |
Tm3Si2C2 | 3.795 | 15.328 | 4.145 | 8.08 |
Dy3Si2C2 | 3.838 | 15.611 | 4.203 | 7.48 |
Tb3Si2C2 | 3.854 | 15.702 | 4.236 | 7.21 |
Pr3Si2C2 | 3.966 | 16.448 | 4.402 | 5.82 |
Table 1 Refined lattice parameters and theoretical density (d) of HE (Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)3Si2C2, (Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)3Si2C2 and (Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)3Si2C2 together with those of RE3Si2C2 (RE = Tm, Y, Dy, Gd, Tb, Pr) obtained from ICDD/JCPDS cards.
Compounds | Lattice parameters | d (g/cm3) | ||
---|---|---|---|---|
a (?) | b (?) | c (?) | ||
(Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)3Si2C2 | 3.848 | 15.638 | 4.220 | 6.83 |
(Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)3Si2C2 | 3.872 | 15.784 | 4.262 | 6.51 |
(Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)3Si2C2 | 3.873 | 15.803 | 4.263 | 6.47 |
Y3Si2C2 | 3.845 | 15.636 | 4.214 | 4.54 |
Gd3Si2C2 | 3.885 | 15.866 | 4.274 | 6.95 |
Tm3Si2C2 | 3.795 | 15.328 | 4.145 | 8.08 |
Dy3Si2C2 | 3.838 | 15.611 | 4.203 | 7.48 |
Tb3Si2C2 | 3.854 | 15.702 | 4.236 | 7.21 |
Pr3Si2C2 | 3.966 | 16.448 | 4.402 | 5.82 |
Compounds | Lattice parameter | d (g/cm3) |
---|---|---|
a (?) | ||
(Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)2O3 | 10.601 | 7.64 |
(Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)2O3 | 10.602 | 7.47 |
(Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)2O3 | 10.606 | 7.43 |
Y2O3 | 10.604 | 5.03 |
Gd2O3 | 10.813 | 7.62 |
Tm2O3 | 10.488 | 8.89 |
Dy2O3 | 10.665 | 8.17 |
Tb2O3 | 10.730 | 7.87 |
Pr2O3 | 11.288 | 6.09 |
Table 2 Refined lattice parameter and theoretical density (d) of HE (Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)2O3, (Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)2O3 and (Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)2O3 together with those of RE2O3 (RE = Tm, Y, Dy, Gd, Tb, Pr) obtained from ICDD/JCPDS cards.
Compounds | Lattice parameter | d (g/cm3) |
---|---|---|
a (?) | ||
(Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)2O3 | 10.601 | 7.64 |
(Tm0.2Y0.2Pr0.2Gd0.2Dy0.2)2O3 | 10.602 | 7.47 |
(Tm0.2Y0.2Pr0.2Gd0.2Tb0.2)2O3 | 10.606 | 7.43 |
Y2O3 | 10.604 | 5.03 |
Gd2O3 | 10.813 | 7.62 |
Tm2O3 | 10.488 | 8.89 |
Dy2O3 | 10.665 | 8.17 |
Tb2O3 | 10.730 | 7.87 |
Pr2O3 | 11.288 | 6.09 |
Fig. 2. (a) SEM image of fracture morphology of a HE (Tm0.2Y0.2Dy0.2Gd0.2Tb0.2)3Si2C2 particle, (b)-(f) corresponding EDS mappings of rare earth elements Tm, Y, Dy, Gd and Tb.
Fig. 4. XRD patterns of HERSC-2 and HERSC-3 together with those of Y3Si2C2, Tm3Si2C2, Pr3Si2C2, Gd3Si2C2, Dy3Si2C2, Tb3Si2C2 obtained from ICDD/JCPDS cards.
Samples | RLmin value (dB) | Frequency of RL (GHz) | EAB (GHz) RL<-10 dB | Thickness (mm) | Ref. |
---|---|---|---|---|---|
HfC/SiC | -33.9 | 12.8 | 7.4 | 3.0 | [ |
β-SiC | -37.94 | 14.0 | 3.5 | 1.5 | [ |
Fe3Si/SiC | -22.5 | 16.5 | 8.5 | 2.5 | [ |
SiC foam | -50.75 | 6.0 | 3.1 | 4.85 | [ |
ZrO2@SiCf/SiC | -11.5 | 10.6 | 1.6 | 2.7 | [ |
NiO@SiC | -46.9 | 10.6 | 3.5 | 2.0 | [ |
SiC/PyC-coated C fiber | -33.65 | 17.16 | 5.94 | 2.25 | [ |
ZrN0.4B0.6/SiC | -50.8 | 7.7 | 2.8 | 3.05 | [ |
SiC nanowires | -17.4 | 11.2 | 2.5 | 3.0 | [ |
SiC/SiO2 | -32.72 | 13.84 | 3.8 | 3.0 | [ |
Al-doped SiC | -25.4 | - | 2.0 | 2.4 | [ |
C fiber-SiC nanowires | -21.5 | 7.7 | 2.45 | 2.0 | [ |
Fe/SiC fibers | -46.3 | 6.4 | 1.9 | 2.25 | [ |
HERSC-2 | -40.7 | 10.0 | 3.4 | 2.9 | This work |
HERSC-3 | -50.9 | 16.2 | 4.5 | 2.0 | This work |
Table 3 Microwave absorption properties of some representative SiC based materials.
Samples | RLmin value (dB) | Frequency of RL (GHz) | EAB (GHz) RL<-10 dB | Thickness (mm) | Ref. |
---|---|---|---|---|---|
HfC/SiC | -33.9 | 12.8 | 7.4 | 3.0 | [ |
β-SiC | -37.94 | 14.0 | 3.5 | 1.5 | [ |
Fe3Si/SiC | -22.5 | 16.5 | 8.5 | 2.5 | [ |
SiC foam | -50.75 | 6.0 | 3.1 | 4.85 | [ |
ZrO2@SiCf/SiC | -11.5 | 10.6 | 1.6 | 2.7 | [ |
NiO@SiC | -46.9 | 10.6 | 3.5 | 2.0 | [ |
SiC/PyC-coated C fiber | -33.65 | 17.16 | 5.94 | 2.25 | [ |
ZrN0.4B0.6/SiC | -50.8 | 7.7 | 2.8 | 3.05 | [ |
SiC nanowires | -17.4 | 11.2 | 2.5 | 3.0 | [ |
SiC/SiO2 | -32.72 | 13.84 | 3.8 | 3.0 | [ |
Al-doped SiC | -25.4 | - | 2.0 | 2.4 | [ |
C fiber-SiC nanowires | -21.5 | 7.7 | 2.45 | 2.0 | [ |
Fe/SiC fibers | -46.3 | 6.4 | 1.9 | 2.25 | [ |
HERSC-2 | -40.7 | 10.0 | 3.4 | 2.9 | This work |
HERSC-3 | -50.9 | 16.2 | 4.5 | 2.0 | This work |
Fig. 7. Electromagnetic parameters of HERSC-1, HERSC-2 and HERSC-3: (a) real permittivity; (b) imaginary permittivity; (c) real permeability; (d) imaginary permeability.
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