Bond characteristics and microwave dielectric properties of high‐Q materials in li‐doped Zn₃B₂O₆ systems

Abstract

The bond characteristics, Raman spectroscopy, and microwave dielectric properties of Zn3‐xLi2x(BO3)2 ceramics prepared by solid‐state reaction method were investigated. According to the complex chemical bond theory, the bond ionicity and lattice energy of the B–O bond were proved to contributed more to the electric polarization and phase structure stability than that of A‐site bond. Thus, the B–O bond had a dominant effect on the dielectric constant and Q × f values. The optimization of the τf value can be attributed to the bond valence. Moreover, the shift and full width at half maximum of the Raman peak were closely related to the dielectric constant and Q × f values, respectively. On the whole, Li+ substitution contributed greatly to improve the temperature stability and reducing the dielectric loss of Zn3‐xLi2x(BO3)2 ceramics. Additionally, Zn2.99Li0.02(BO3)2 ceramics sintered at 850 °C exhibited satisfactory microwave dielectric properties of εr=6.59, Q × f=122,030 GHz, τf=−76.9 ppm/°C, and had good chemical compatibility with silver.

Operando Building of a Superior Interface Hybrid Film Enables Chemomechanically Durable Co-Free Ni-Rich Cathodes

“…The in situ Raman and in situ Fourier-transform infrared spectroscopy (FT-IR) analyses were carried out to unveil the role of the TMSB additive. As shown in Figure 1c, a new Raman characteristic peak begins to appear at 975 cm −1 when the potential increases to 3.55 V, which is attributed to the stretching vibration of the B−O bond, 23 an indicator of the TMSB decomposition onset. Figure 1d shows the corresponding mappings derived from the intensity ratio of the B−O bond at various potentials.…”

Processing strategy and composite regulation on dielectric performance in Li2O–Al2O3–B2O3 dielectric systems using SrTiO3

“…Table 1 presents a comparison of the microwave dielectric properties of various low-temperature fired borate ceramics. 21,[30][31][32]39,[42][43][44] Borates exhibit low dielectric permittivities (ε r < 10), which is advantageous in reducing signal delay. Notably, lithium-containing borates possess ultralow densities (∼2 g/cm 3 ), while those containing bismuth or barium have relatively high densities.…”

“…Table 1 presents a comparison of the microwave dielectric properties of various low‐temperature fired borate ceramics 21,30–32,39,42–44 . Borates exhibit low dielectric permittivities ( ε r < 10), which is advantageous in reducing signal delay.…”

Mechanism study of the Mn‐substituted magnesium borate: Decreased sintering temperature and improved dielectric property

“…The crystallite size ( D ) was obtained through the Williamson–Hall (W–H) equation, 18 where β T , θ , ε , λ , and K is the abbreviation of the full width at half maximum, angle, micro strain (slope of fitted line), wavelength of radiation (1.5406 Å) and shape factor (0.9), respectively. The density of the cylinder was measured through the Archimedes method 19 …”