Crystal structure, Raman spectrum, bond characteristics, and terahertz time-domain spectrum of novel Na5Tm(MoO4)4 microwave dielectric ceramic with ultra-low sintering temperature and high quality factor

Novel microwave dielectric ceramics based on CaO–MoO3–La2O3 pseudo‐ternary phase diagram and the design of patch antenna

“…Therefore, employing Equations () and (), this study further calculated the gas pore‐corrected dielectric constant ( ε corr. ) of the two ceramics. 25 $$$$\begin{equation}P{\mathrm{\; = \;1}} - {\rho _{{\mathrm{relative}}}}\end{equation}$$$$ $$$$\begin{equation}{\varepsilon _{{\mathrm{corr}}{\mathrm{.$$…”

Zn2+-Enhanced Lithium Magnesium Molybdate Ultralow Temperature Cofired Ceramics for Terahertz Wavefront Modulation Applications

“…14−18 In comparison, ULTCC (sintering temperature (ST) <650 °C) has the advantages of low power consumption, low time cost, and high-temperature sensitivity. 14,17,19 Among them, the high-temperature sensitivity means that the dielectric properties of the ceramics can be significantly improved with a small change in the ST. There are many ceramic systems that meet ULTCC, including vanadates, borates, tungstenates, tellurates, molybdates, and glass ceramics.…”

“…The right process will improve the dielectric properties of ceramic materials with half the effort. Common ceramic processes that can be cofired with metal electrodes include ultralow temperature cofired ceramics (ULTCC), low temperature cofired ceramics, and high temperature cofired ceramics. − In comparison, ULTCC (sintering temperature (ST) <650 °C) has the advantages of low power consumption, low time cost, and high-temperature sensitivity. ,, Among them, the high-temperature sensitivity means that the dielectric properties of the ceramics can be significantly improved with a small change in the ST. There are many ceramic systems that meet ULTCC, including vanadates, borates, tungstenates, tellurates, molybdates, and glass ceramics. ,− Many of these ULTCC ceramics have maintained excellent microwave dielectric properties in the microwave band.…”

“…Common ceramic processes that can be cofired with metal electrodes include ultralow temperature cofired ceramics (ULTCC), low temperature cofired ceramics, and high temperature cofired ceramics. − In comparison, ULTCC (sintering temperature (ST) <650 °C) has the advantages of low power consumption, low time cost, and high-temperature sensitivity. ,, Among them, the high-temperature sensitivity means that the dielectric properties of the ceramics can be significantly improved with a small change in the ST. There are many ceramic systems that meet ULTCC, including vanadates, borates, tungstenates, tellurates, molybdates, and glass ceramics. ,− Many of these ULTCC ceramics have maintained excellent microwave dielectric properties in the microwave band. For example, Professors Joseph and Varghese have developed a series of ULTCC ceramics, including CuMoO 4 (ε r = 7.9, Q × f = 53,000 GHz, τ f = −36 ppm/°C), Ag 2 O-CuMoO 4 (ε r = 9, Q × f = 37,000 GHz, τ f = −33 ppm/°C), 10Li 2 O-10Na 2 O-20K 2 O-60MoO 3 (ε r = 4.85, Q × f = 11,078 GHz, τ f = +291 ppm/°C), α-MoO 3 (ε r = 6.6, Q × f = 41,000 GHz, τ f = −25 ppm/°C), anatase TiO 2 A-30GO17 (ε r = 9.9, Q × f = 1650 GHz, τ f = +7.4 ppm/°C), and rutile TiO 2 R-30GO17 (ε r = 15, Q × f = 3300 GHz, τ f = +8.3 ppm/°C). − In addition, a series of multilayer ceramic substrates have been developed using the above materials and the tape-casting process. − However, although ULTCC ceramics with excellent microwave dielectric properties have been successfully developed, ULTCC ceramics that also possess excellent terahertz transmission properties have rarely been reported.…”