Enhanced Sinterability and Microwave Dielectric Performance of (1 − x)ZnAl2O4-xLi4/3Ti5/3O4 Ceramics

Mechanism of ionic polarizability, bond valence, and crystal structure on the microwave dielectric properties of disordered Li10MTi13O32 (M = Zn, Mg) spinels

“…In order to overcome the high sintering temperature, τ f is not close to zero for traditional spinels, so a large number of Li-containing spinels have been reported, such as Li 2 ATi 3 O 8 (A = Zn, Mg), 11,12 LiGa 5 O 8 , 13,14 Li 2 Zn 3 Ti 4 O 12 , 15 and Li 4 Ti 5 O 12 . 16–18 Concerning the Li 2 O–AO–TiO 2 (A = Zn, Mg) systems, recent studies have focused on the characterization and microwave dielectric properties of two ordered ceramics of Li 2 ZnTi 3 O 8 ( ε r = 25.6–26.2, Q × f = 62 000–72 000 GHz, and τ f = −15 to −11.2 ppm per °C) and Li 2 MgTi 3 O 8 ( ε r = 20.2, Q × f = 42 000 GHz, and τ f = +3.2 ppm per °C), but the microwave dielectric properties of disordered spinel ceramics have rarely been reported. For ordered Li-containing spinels, Li 4b and Ti 12d at the octahedral sites were arranged spontaneously into 1 : 3 cation ordering ( i.e.…”

Synergistic Structural Engineering of Tunnel‐Type Polyantimonic Acid Enables Dual‐Boosted Volumetric and Areal Lithium Energy Storage

“…This can be further corroborated by the appreciable theoretical density (5.66 g cm -3 ) in the case of Mn 2+ -fully-occupied PAA, which is much higher than that of pristine PAA (4.29 g cm -3 ), and even than most of commonly investigated electrode materials in LIBs, such as graphite (2.26 g cm -3 ), Li 4 Ti 5 O 12 (3.42 g cm -3 ), Si (2.33 g cm -3 ), Fe 2 O 3 (5.26 g cm -3 ), MnO (5.43 g cm -3 ) and Nb 2 O 5 (4.47 g cm -3 ). [18][19][20][21][22][23] Such a considerable theoretical density of Mn-substituted PAA makes it promising in acquiring high tap density so as to probably build relatively thinner electrodes under identical high mass loadings, in turn contributing to high areal and volumetric capacities.…”

Improved sinterability and microwave dielectric properties of [Zn0.5Ti0.5]3+‐doped ZnAl2O4 spinel solid solution

“…ZnAl 2 O 4 ceramic with a spinel structure and an Fd‐3m space group has been previously proposed and has been eliciting ongoing scientific research due to its considerable quality factor and relatively cheap raw materials for application . ZnAl 2 O 4 ceramic has a low ε r of ∼8.5, a high Q × f of ∼57 000 GHz, and a large negative τ f of ∼−79 ppm/°C .…”