High Temperature Cofired Ceramic (HTCC), Low Temperature Cofired Ceramic (LTCC), and Ultralow Temperature Cofired Ceramic (ULTCC) Materials

Novel scheelite‐type [Ca0.55(Nd1‐xBix)0.3]MoO4 (0.2 ≤ x ≤ 0.95) microwave dielectric ceramics with low sintering temperature

“…The infrared spectra can be analyzed using the Fresnel formula (3) where the IR reflectance denoted as R(ω); the dielectric function of R(ω) denoted as ɛ'(ω); the high-frequency dielectric constant attributed to the electronic polarization denoted as ɛ ∞ ; the plasma and transverse frequency denoted as ω pj and ω oj , respectively, γ j and n represent the damping factor and the phonon mode number, respectively.…”

“…Third, the temperature coefficient of resonant frequency τ f values of the microwave ceramics should approach the zero to improve the temperature independence of microwave devices. Finally, the raw materials of the microwave ceramics should be nontoxic for the environment 3‐10 …”

“…Finally, the raw materials of the microwave ceramics should be nontoxic for the environment. [3][4][5][6][7][8][9][10] Recently, the A 2+ B 6+ O 4 (A 2+ = Mg, Mn, Ca, Zn, Cd, and B 6+ = Mo, W) oxides with scheelite structure have been widely investigated on their microwave dielectric properties. 11,12 Due to the low sintering temperature and the adaptive crystal structure providing the potential for the various substitutions at A-or B-site, these compositions have received extensive attentions in LTCC technology.…”

Microwave dielectric properties of low-temperature-fired MgNb2O6 ceramics for LTCC applications

“…The forward evolution of electronics, power systems, satellite broadcasting and wireless communication, 1 especially the rapid development of 5G communication, have posed great demands for high integration and miniaturization. 2,3 And considering their excellent microwave dielectric properties, microwave dielectric materials have attracted more attention in passive electronic components, such as dielectric resonators, lters and other devices. 4,5 Additionally, LTCC technology is favored by advanced products because of their high demands for miniaturization and hybrid integration for electronic systems.…”

Multilayer Functional Tapes Cofired at 450 °C: Beyond HTCC and LTCC Technologies

“…12 So far, there have been only a few devices developed based on this concept, 19 although several materials with outstanding dielectric properties suitable for microwave telecommunication applications are reported. 13,20 In addition to microwave materials, functional ceramics such as piezoelectrics are also technologically important because of their broad areas of application covering different sensing solutions, acoustic emission, sonars, flow meters, acceleration, dynamic force measurements, and fuel level meters and, most recently, energyharvesting solutions. 21 Lead zirconium titanate (PbZr x Ti 1−x O 3 , PZT) is the most well-known and widely used commercial piezoelectric material.…”