A low εr and temperature-stable Li3Mg2SbO6 microwave dielectric ceramics

Honeycomb layered oxides: structure, energy storage, transport, topology and relevant insights

“…Recent reports are also emerging on honeycomb layered oxides as photocatalysts, optical materials, superfast ionic conductors, and so forth. [12][13][14][250][251][252]254,255,267,[441][442][443][444] A grand challenge with most of these materials lies in their handling. Particularly for honeycomb layered oxides comprising alkali ions with large radii such as potassium and rubidium, handling demands the presence of a controlled atmosphere (videlicet, storage in argon-purged glove boxes) as they are sensitive to moisture (hygroscopic) and air.…”

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

“…[143][144][145][146][147] Tetravalent Ti 4+ and pentavalent V 5+ , Sb 5+ , Ta 5+ , and hexavalent W 6+ ions are reported to substitute for Nb sites. [148][149][150][151][152][153][154] For instance, a Ta 5+ ion replaces an Nb site in Li 3 Mg 2 Nb 1−x Ta x O 6 (x = 0-0.04) system leading to a decrease in cell volume, and the ε r value increases along with the x value owing to the enhancement in dielectric polarizability. The Q × f value consistent with PF and relative density show an increasing trend with the x value.…”

Zn-modified Li3Mg2SbO6 microwave dielectric ceramics with high quality factor

“…The Q × f curves for different specimens present similar variation trends, increasing rstly and reaching to maximum values then declining with the sintering temperature. The maximum Q × f value of 97,719 GHz is obtained in the sample of x = 0.04 sintered at 1325 ℃, which is enhanced signi cantly compared with that of the previous study on Li 3 Mg 2 SbO 6 [15]. In general, the dielectric loss of the microwave ceramics is dominated by two primary factors: intrinsic structural characteristics such as packing fraction; and extrinsic factors such as the density, grain size, porosity, grain boundaries, and secondary phases [25][26][27].…”