Combined synthesis methods for producing LaNbO4 ceramics and investigation of microwave dielectric properties based on complex chemical bond theory

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

“…† Here, we summarize the bond ionicity, lattice energy and microwave dielectric properties in Table 12. 197,199 Combined with Table 6S in ESI † and Table 12, it can be found that all the ionicity f i values of the chemical bonds in LaNbO 4 are smaller than those in the NdNbO 4 system. For the two structures, specifically, Af i values of Nd-O bonds are very close to those of Nb-O bonds, and their susceptibility contribution ratios are also very similar.…”

“…e.g. an ε r of 19.6, a Q × f value of about 33 000 GHz and a τ f of −24 ppm per °C are obtained for an NdNbO 4 ceramic, 82 and for an LaNbO 4 ceramic sintered at 1275 °C: ε r = 20.3, Q × f = 59 740 GHz, τ f = 7.44 ppm per °C, 197 and a much lower dielectric loss is found in (La 0.92 Sm 0.08 )NbO 4 ceramics with an ε r value about 19.37, a Q × f value of 62 203 GHz and a τ f of ca. 2.57 ppm per °C.…”

Enhanced Dielectric Permittivity of Optimized Surface Modified of Barium Titanate Nanocomposites

“…Either ceramic dielectric oxides or polymers are used for majority of the aforesaid applications because ceramic oxides possess high dielectric permittivity (ε r = 200-10,000 [4][5][6][7]) and high stiffness (elastic modulus between 50-100 GPa [8][9][10][11]). These materials also suffer from high dielectric loss over broad frequency bands and relatively high mechanical stiffness, which makes them susceptible to premature failure when subjected to extensive cyclic operation and inherently low breakdown field strength.…”

Preparation and microwave properties of ZnTiNb2O8/SmTiNbO6composite dielectric ceramics

“…The (1-x) ZnTiNb 2 O 8 -x SmTiNbO 6 composite ceramic with the same content of SmTiNbO 6 is sintered at 1150℃, and the permittivity of the ceramic obtained is shown in Figure 2. When x is relatively small, (Zn 0.15 Nb 0.3 Ti 0.55 )O 2 and SmNbO 4 are formed which have low permittivity(ε r ), so the permittivity of the composite ceramic shows a downward trend [5,6]. When x=0.35, the permittivity reaches to the minimum value of 24.63.…”