Sintering behavior, phase composition, microstructure, and dielectric characteristics of garnet-type Ca3Fe2Ge3O12 microwave ceramics

Influence of sintering characteristics and structural properties on the microwave dielectric properties of non-stoichiometric Ca3Mn2+xGe3O12+δ (x = 0–0.2) ceramics

“…In particular, the Ca 3 B 2 Ge 3 O 12 ceramic system, with the B site occupied by a transition element, typically exhibits a high quality factor. Notably, Ca 3 Sc 2 Ge 3 O 12 , 15 Sr 3 Y 2-Ge 3 O 12 , 16 and Ca 3 Fe 2 Ge 3 O 12 3 ceramics, which we previously report, exhibit excellent microwave dielectric properties with high Q Â f and low relative permittivity (e r ) values (B10), making them suitable for higher signal transmission rates. 3 However, to the best of our knowledge, no work to date has reported the microwave dielectric properties of Ca 3 Mn 2 Ge 3 O 12 ceramics with B sites occupied by Mn.…”

“…Notably, Ca 3 Sc 2 Ge 3 O 12 , 15 Sr 3 Y 2-Ge 3 O 12 , 16 and Ca 3 Fe 2 Ge 3 O 12 3 ceramics, which we previously report, exhibit excellent microwave dielectric properties with high Q Â f and low relative permittivity (e r ) values (B10), making them suitable for higher signal transmission rates. 3 However, to the best of our knowledge, no work to date has reported the microwave dielectric properties of Ca 3 Mn 2 Ge 3 O 12 ceramics with B sites occupied by Mn. In this study, a series of Ca 3 Mn 2+x Ge 3 O 12+d (x = 0-0.2) ceramics with a garnet structure was prepared using a solid-state reaction method, whereby the pure phase of Ca 3 Mn 2-Ge 3 O 12 was obtained when x = 0.1.…”

“…At microwave frequencies, the e r is typically influenced by factors such as density, polarisability, and second phase. 3 Generally, changes in sintering temperature do not induce changes in the ion polarisability within the ceramic. The composition of the physical phase and the microscopic defects of the ceramics are the main non-intrinsic factors contributing to changes in e r .…”

Ultra‐high Quality Factor of (Zn2/3Nb1/3)3+ Co‐substitution MgAl2O4 Microwave Dielectric Ceramics

“…As a result, microwave dielectric ceramics with low dielectric constants and high Qf values have received considerable attention. [4][5][6] To date, low dielectric constant materials such as alumina (Al 2 O 3 ), [7] AB 2 O 4 spinel systems, [8][9][10][11][12] and garnet types [13,14] have been investigated. Among them, the magnesium aluminate (MgAl 2 O 4 ) spinel has attracted significant attention owing to its great potential in low-permittivity microwave ceramics (ε r = 7.9).…”

“…To date, low dielectric constant materials such as alumina (Al 2 O 3 ), [ 7 ] AB 2 O 4 spinel systems, [ 8–12 ] and garnet types [ 13,14 ] have been investigated. Among them, the magnesium aluminate (MgAl 2 O 4 ) spinel has attracted significant attention owing to its great potential in low‐permittivity microwave ceramics ( ε r = 7.9).…”