Microwave dielectric properties of (1−x)ZnMoO4–xTiO2 composite ceramics

A novel formula for the quality factor calculation for the multiphase microwave dielectric ceramic mixtures

“…In practice, ceramics are always needed to be mixed to form multiphase mixtures to stabilize the work frequency, in other words, to obtain a ceramic with a zero temperature coefficient at the resonant frequency [2,[7][8][9][10][11][12][13]. While the composites' dielectric constant can be well predicted by the Maxwell-Wagner formula, the issue of the quality factor calculation has not been well solved yet [3,[14][15][16].…”

A combined theoretical and experimental study of electronic structure and optical properties of β-ZnMoO4 microcrystals

“…In the monoclinic structure, the zinc and molybdenum atoms are surrounded by six oxygens which form the distorted octahedral [ZnO 6 ]/[MoO 6 ] clusters [6]. Both α-and β-ZnMoO 4 crystals in undoped and doped forms have been investigated because of their interesting electronic properties and high potential for possible industrial applications in various scientific fields such as: luminescence [7][8][9], red/green phosphors for lightemitting diodes [10][11][12][13][14][15][16], cryogenic/bolometric scintillating detectors [16][17][18][19], microwave dielectric [20], anticorrosive paints [21], cathode electrode in lithium batteries [22], photocatalyst for degradation of Victoria blue R and methyl orange dyes [23,24], and as a humidity sensor [25].…”

Fabrication of nanopowders by high energy ball milling and low temperature sintering of Mg2SiO4 microwave dielectrics

“…These applications demand microwave substrate materials with high quality factor (Q × f) to achieve high selectivity, low dielectric constant (ε r ) to reduce the delay time of electronic signal, and nearly zero temperature coefficient of resonant frequency ( f ) for frequency stability. Promising candidates include as Mg 2 SiO 4 (Q × f = 40,000-240,000 GHz, ε r = 6-7, f = −60 ppm/ • C) [1,2], Al 2 O 3 (Q × f = 680,000 GHz, ε r = 10, [3,19], Mg 2 SnO 4 (Q × f = 55,100 GHz, ε r = 8.41, f = −62 ppm/ • C) [11], Ba(Zn 1/3 Ta 2/3 )O 3 (Q × f = 120 THz) [23], Li 2 MgTi 3 O 8 (Q × f = 36,200 GHz, ε r = 26, f = −2 ppm/ • C) [24] and other microwave dielectrics materials [25][26][27][28][29][30][31][32][33]. Among these materials, forsterite Mg 2 SiO 4 has attracted a great attention with low dielectric constant and loss tangent.…”