Structural dependence of the microwave dielectric properties of Cr³⁺-substituted ZnGa₂O₄spinel ceramics: crystal distortion and vibration mode studies

Abstract

Establishment of a correlation between the crystal structure (octahedral distortion and short range ordering) and microwave dielectric performance of spinel structured Cr-ZGO.

Crystal structure dependence of the microstructure and microwave dielectric properties of (SrxCa1−x)(Zr0.95Ti0.05)O3 (0 ≤ x ≤ 1) perovskite ceramics

“…50,51 The lower the FWHM of the Raman peak associated with B-O stretching vibration, the higher the order degree or the lower the disorder degree of the short-range cation at the octahedral position. 52 According to Fig. 8(d), the FWHM of the Raman peak (550-557 cm À1 ) A g associated with the B-O stretching vibration first increases and then decreases with the increase of substitution x, so the short-range order degree of the corresponding sample first decreases and then increases.…”

Sc Modification Induced Short-range Ordering in ZnGa2O4 Spinel Leading to High Microwave Dielectric Performance

“…Classically, materials with close packed, ordered structure, high density, good crystallinity and fine morphology possess low dielectric loss because of lower vibration loss, grain boundary and impurity loss. In our previous study, Cr 3+ doped ZnGa2O4 obtain excellent microwave dielectric properties due to the higher density and higher short-range cation ordering [21]. Cu 2+ was also applied to form Cu-ZGO solid solutions and obtain mixed spinel structure, the higher density and higher short-range cation ordering contribute to the higher Q×f [22][23].…”

“…This type of crystal structure has a great variability because of variety cation selections, and possibilities in cation ordering such as common spinel (AB2O4), inverse spinel (B(AB)O4) and mixed-type spinel. So far, spinel structured ceramics for high frequency application include M2SnO4 [13][14], M2SiO4 [15][16], MAl2O4 (M=Zn, Mg) [17][18] and MGa2O4 (M = Zn, Mg) [19][20][21][22][23].…”

Quantum mechanical modeling of Zn‐based spinel oxides: Assessing the structural, vibrational, and electronic properties

“…[ 24–27 ] Furthermore, the correlation between microwave dielectric properties, changes in the crystal structure, and cation distribution of Cr‐doped ZnGa 2 O 4 have been systematically investigated. [ 28 ] Besides, pure and In‐doped ZnGa 2 O 4 has been reported for its promising photo‐induced applications. [ 9,29,30 ]…”

“…[24][25][26][27] Furthermore, the correlation between microwave dielectric properties, changes in the crystal structure, and cation distribution of Cr-doped ZnGa 2 O 4 have been systematically investigated. [28] Besides, pure and In-doped ZnGa 2 O 4 has been reported for its promising photo-induced applications. [9,29,30] On the other hand, inverse spinel, such as the Zn 2 SiO 4 ,tructure, is an extremely versatile and very attractive host matrix for phosphors because of its excellent optical property on the microstructure, morphology, and binding energy.…”