Investigating the ultralow dielectric loss of spinel-like and modified orthorhombic perovskite ceramic structures for microwave applications

Figures & data

Figure 1. Crystal structure of (Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ as the same Mg₂TiO₄.

Figure 2. X-ray diffraction patterns of (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintered at 1325°C for 4 h.

Figure 3. X-ray diffraction patterns of a 0.92(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄-0.08(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramic sintered at various temperatures.

Figure 4. SEM micrographs of 0.92(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - 0.08(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintered at various temperatures.

Figure 5. The marks of SEM for the 0.92(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - 0.08(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sinter at 1375°C.

Table 1. EDX data of 0.92(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄- 0.08(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics for areas A and B.

elements	Mg	Co	Sn	Ca	Sr	Ti	O
Area A	0	0	2.35	26.23	3.53	28.46	39.43
Area B	30.01	1.23	1.25	0	0	12.53	54.98

Figure 6. Relative density of (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintered at various temperatures.

Figure 7. Dielectric constant curves of (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄- y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintering at different temperatures for 4 hrs.

Table 2. Microwave dielectric properties of the (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄- y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintered at 1325°C for 4 hrs.

y value	Bulk density (g/cm^3)	εr	Q×f (GHz)	τf (ppm/^oC)
0.08	3.770	18.42	237211	3.79
0.09	3.783	19.47	215128	6.11
0.10	3.801	20.31	208111	9.58
0.11	3.836	21.34	200963	17.58
0.12	3.851	21.77	182297	22.22

Figure 8. Q×f values of (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramics sintered at various temperatures for 4 h.

Figure 9. τ_f values of (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ system sintering at different temperatures for 4 h.

Figure 10. Layout of a band-pass filter with a (1-y)(Mg_0.95Co_0.05)₂(Ti_0.97Sn_0.03)O₄ - y(Ca_0.95Sr_0.05)(Ti_0.97Sn_0.03)O₃ ceramic substrate.

Table 3. Simulation results of the Band-Pass Filters Using Different Dielectrics.

substrate	tanδ	εr	Size(mm^2)	Insertion loss (dB)	Return loss (dB)	fo
FR4	0.015	4.5	34.2×15.9	5.14	8.71	2.39
Al2O3	0.003	9.8	22.7×12.5	0.86	19.63	2.4
0.92(Mg0.95Co0.05)2(Ti0.95Sn0.05)O4- 0.08(Ca0.95Sr0.05)(Ti0.97Sn0.03)O3	0.0001	18.42	17.4×7.4	0.37	19.51	2.4

Data availability statement

The data supporting the findings of this study are openly available to the reviewers.