Vibrational Analysis of Ba5−xSrxNb4O15Microwave Dielectric Ceramic Resonators

Tl1−xNaxNb2PO8 and Related Compounds, Isostructural with Ca0.5+xCs2Nb6P3O24

“…The M}O stretching modes, either in infrared or in Raman, appear in relatively high ranges because of the highly distorted MO octahedra (Table 4), which is in agreement with previous results in the literature (26,27).…”

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa4Ti5O17 ceramics

“…The observed decrease in Q u f o (Fig. 5) upon increasing Sn content from 1 to 2 may be due to the formation of secondary phases, whose interface causes additional dielectric loss [10]. τ f decreased from 117 to 23.0 ppm/°C (Fig.…”

“…Generally, corner shared and edge-shared octahedra are predominant in (Nb, Ti)-O polyhedra. In the corner-shared octahedra, the symmetric stretching vibrations are observed in the 750 to 850 cm −1 region [10]. In the present study, the highest frequency A 1g mode at 793.08 cm −1 for x = 0 corresponds to the symmetric metal-oxygen stretching vibrations of the BO 6 octahedra, but it is shifted towards lower frequency of 781 cm −1 as the value of x increased from 0 to 2, along with a decrease in its intensity.…”

Tuning dielectric properties in ceramics with anisotropic grain structure: The effect of sintering temperature on BaLa4Ti4O15

“…6. BLT is a Ba 5 Nb 4 O 15 [21] analogue, a having centrosymmetric hexagonal structure with space group P c1 and its point group D3d (-3m). One can expect 72 normal modes of vibration for the tilted BLT compound;…”