Dielectric Ceramics Research Articles

Boosting energy storage performance in negative temperature coefficient linear-like dielectrics via composite modulation in the superparaelectric state

Developing dielectric ceramics with both negative temperature coefficient of capacitance (NTCC) and excellent energy storage performance is beneficial to obtain multifunctional dielectric ceramic capacitors. An effective strategy of composite modulation in the superparaelectric (SPE) state is proposed in BaTiO3-BaZrO3-CaTiO3 (BT-BZ-CT) system to achieve the above two points. The simultaneous addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone and the NTCC characteristic with enhanced energy storage performance can be obtained; and the intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution as well, thus enhancing the breakdown electric field (Eb). Benefiting from these features, EIA class I-R3L code NTCC together with a high Wrec (∼3.46 J/cm3) and η (90.8%) were achieved in 20BT-40BZ-40CT system, providing a paradigm for building NTCC dielectric materials with high energy-storage performance.

Microwave dielectric properties and sintering behavior of a novel low-cost lightweight,middle-εr Na2Ti6O13 ceramics

In order to develop novel lightweight low-cost microwave dielectric ceramics (MDCs), middle-εr Na2Ti6O13 ceramics were prepared by a traditional solid-state reaction method and the sintering behavior and microwave dielectric properties ((MDPs) were investigated. The detailed structural parameters of the Na2Ti6O13 ceramics were obtained by X-ray diffraction and Rietveld refinement, and the chemical bond characteristics of the structures were further studied using Raman spectroscopy. The relative density of the ceramics and scanning electron microscopy (SEM) images show that density and porosity are important factors affecting the dielectric properties of the samples. Based on the acquired Raman spectra and complex chemical bond theory (P–V–L theory), the chemical bond properties were calculated and analyzed, and the effects of intrinsic factors on the MDPs were investigated. The MDPs of Na2Ti6O13 ceramic sintered at 1025 °C were as follows: εr = 34.3, Q×f = 33660 GHz, and τf = 40.3 ppm/°C.

Low-Permittivity and Low-Temperature Cofired BaSO4-BaF2 Microwave Dielectric Ceramics for High-Reliability Packaged Electronics.

In developing low-temperature cofired ceramic (LTCC) technology for high-density packaging or advanced packaged electronics, matching the coefficient of thermal expansion (CTE) among the packaged components is a critical challenge to improve reliability. The CTEs of solders and organic laminates are usually larger than 16.0 ppm of °C1-, while most low-permittivity (εr) dielectric ceramics have CTEs of less than 10.0 ppm °C1-. Therefore, a good CTE match between organic laminates and dielectric ceramics is required for further LTCC applications. In this paper, we propose a high-CTE BaSO4-BaF2 LTCC as a potential solution for high-reliability packaged electronics. The BaSO4-BaF2 ceramics have the advantages of a wide low-temperature sintering range (650-850 °C), low loss, temperature stability, and Ag compatibility, ensuring excellent performance in LTCC technology. The 95 wt %BaSO4-5 wt %BaF2 ceramic has a εr of 9.1, a Q × f of 40,100 GHz @11.03 GHz (Q = 1/tan δ), a temperature coefficient of the resonant frequency of -11.2 ppm °C1-, a CTE of +21.8 ppm °C1-, and a thermal conductivity of 1.3 W mK-1 when sintered at 750 °C. Furthermore, a dielectric resonant antenna using BaSO4-BaF2 ceramics, a typically packaged component of LTCC and laminate, was designed and used to verify the excellent performance by a gain of 6.0 dBi at a central frequency of 8.97 GHz and a high radiation efficiency of 90% over a bandwidth of 760 MHz. Good match and low thermal stress were found in the packaged components of BaSO4-BaF2 ceramics, organic laminates, and Sn-based solders by finite element analysis, proving the potential of this LTCC for high-reliability packaged electronics.

Medium-high K LiNb0.6Ti0.5-x(Zn1/3Nb2/3)xO3 microwave dielectric ceramics for miniaturized dielectric resonant antennas

High performance and miniaturization are becoming increasingly important for practical microwave electronics and high-density communication systems. Here, LiNb0.6Ti0.5-x(Zn1/3Nb2/3)xO3 (LNT-xZN, x = 0, 2, 4, 6, 8 mol%) ceramics have been successfully prepared by a solid-phase reaction. The relationship between the physical structure, microscopic morphology, Raman spectroscopy, and microwave properties is revealed. The better microwave dielectric properties of the LNT-4ZN ceramic sintered at 1075 °C are εr∼59.9, Q×f∼8261 GHz, and τf∼-7.4 ppm/°C. Using this ceramic, a miniaturized dielectric resonant antenna (DRA) is designed and demonstrated. The return loss, radiation efficiency, and realized gain of this device at the center frequency are −43.57 dB, 78.4 %, and 8.59 dB, respectively. The antenna, in addition to the good radiation performance, has a size advantage over similar devices (#Cylindrical sample, #R 3.1 mm × h 1.6 mm, @Square substrate, @a = b = 18 mm × h 3.1 mm). This work exemplifies the great potential of LNT-4ZN materials in communication devices and promotes the application of microwave dielectric ceramics in antenna fields.

Designing a new KBT-based binary solid solution as a candidate for dielectric energy storage materials

Dielectric energy storage capacitors offer great potential in pulsed power devices due to the high power density and fast charging-discharging rate. Designing a host material with high field-induced polarization is of importance for developing dielectric energy storage materials via further composition modulation. In this paper, we compare the microstructure, dielectric, and ferroelectric properties as well as the energy storage performance of samples K1/2Bi1/2TiO3(KBT), 75KBT-25BiFeO3 (KBTF25), and 88KBT-12Bi0.85Nd0.15FeO3 (KBNTF12) in detail. It is found that, among three samples, sample KBNTF12 possesses the most complex local structure coexisting of a four-distortions with different polarities; meanwhile, sample KBNTF12 behaves as a strong relaxor, thus giving a high field-induced polarization. Besides, sample KBNTF12 realizes the highest electric breakdown strength Eb among three samples, which is resorted to the highest resistivity of grain boundary. Highest ΔP and Eb of sample KBNTF12 among three samples render it achieve ultrahigh stored energy density Ws of 6.94 J/cm3, high recoverable energy density Wr of 5.23 J/cm3, and high efficiency η of 75.4%. Our work suggests that 88KBT-12BNF binary composition be an optimal candidate for dielectric energy storage ceramics.

The structural characteristics and microwave dielectric properties of (Mg0.5Ti0.5)3+ substituted Sr0.6Ca0.4LaAlO4 ceramics

Achieving both high Qf and near-zero τf values for microwave dielectric ceramics in the microwave frequency band is challenging. In this work, the effect of (Mg0.5Ti0.5)3+ substitution on the structural characteristics and microwave dielectric properties of Sr0.6Ca0.4LaAlO4 ceramics was systematically investigated. The Sr0.6Ca0.4LaAl1-x(Mg0.5Ti0.5)xO4 (x = 0–0.5) ceramics were successfully synthesized. The average bond length of Sr/Ca/La–O for Sr0.6Ca0.4LaAl1-x(Mg0.5Ti0.5)xO4 ceramics is related to the dielectric constant (εr). The relative density of the ceramics and FWHM of the Raman peak have strong effects on the Qf values. There is a dependence of the [AlO6] octahedral distortion on the τf values, which provides new possibilities for tuning the temperature coefficient of the K2NiF4-type ceramics. When x is 0.4, the excellent microwave dielectric properties are obtained as following: εr = 20.52, Qf = 103,600 GHz (at 7.79 GHz), and τf = −3.77 ppm/°C. The above work provides a deeper insight into the relationship between the crystal structure characteristics and the microwave dielectric properties of the K2NiF4-type ceramics.

Crystal structure and phase formation of MgO–MoO3‐based ceramics with ultralow dielectric loss: A comprehensive study

AbstractThe MgO‐MoO3 system shows significant potential for applications in microwave dielectric ceramics. However, the formation mechanism, crystal structures, and microwave dielectric properties of this system have not been systematically investigated. This work aims to comprehensively study the crystal structures, phase transitions, and microwave dielectric properties of compounds in the MgO‐MoO3 system. In particular, the research delves into the unexplored transformation mechanism from β‐MgMo2O7 to α‐MgMo2O7 and MgMoO4. As a result, the three compounds exhibiting favorable microwave dielectric properties have been successfully fabricated. These compounds can be effectively sintered at temperatures ranging from 685 to 900°C and exhibited dielectric constants (εr) ranging from 5.41 to 6.89, as well as Qf values ranging from 100 000 to 130 000 GHz. Additionally, prototype microstrip antennas are designed and fabricated using β‐MgMo2O7 and MgMoO4 ceramics as substrates. The obtained antenna's performance is excellent, with S11 values below −30 dB and a gain exceeding 6 dB at 5.8 GHz, highlighting the potential of the developed ceramics for practical applications in microwave devices.

Mg/Ti co‐substituted CaSmAlO4‐based microwave dielectric ceramics with temperature stability in a wide temperature range

AbstractTo obtain microwave dielectric ceramics with excellent dielectric properties and temperature stability over a wide temperature range, we co‐substituted CaSmAlO4 ceramics with Mg/Ti and prepared CaSmAl1−x(Mg0.5Ti0.5)xO4 (0.1 ≤ x ≤ 0.4) ceramics using traditional solid‐state methods. It was found that some Al3+ was replaced by composite ions (Mg0.5Ti0.5)3+, which optimized the dielectric properties of the ceramics. As the substitution amount increases, the dielectric constant of the sample increases synchronously, whereas the quality factor gradually decreases. The temperature coefficient of the resonant frequency first increases and then falls. Finally, the CaSmAl1−x(Mg0.5Ti0.5)xO4 (0.1 ≤ x ≤ 0.4) ceramics obtained excellent dielectric properties after sintering at 1450°C for 4 h at a substitution x of 0.2: εr = 19.9, Q × f = 64 920 GHz, τf = 3.17 ppm/°C (−40 to 25°C), and 0.17 ppm/°C (25–125°C).

Achieving high energy-storage performance of medium-entropy (Na0.25Bi0.25Ca0.25Sr0.25)TiO3 lead-free relaxor ferroelectric ceramic for pulsed power capacitor

Advanced electrostatic energy-storage science and technology based on dielectric ceramics capacitors are widely applied in pulsed power systems. Recently, entropy increasing design engineering has been considered as an available method to promote electrical characteristics in dielectric energy-storage ceramics. In this study, medium-entropy (Na0.25Bi0.25Ca0.25Sr0.25)TiO3 (NBCSTO) ceramics with good energy-storage properties were obtained by a conventional solid-state reaction method. The microstructure and element analysis results show that a perovskite structure was identified for the NBCSTO sample, and no secondary phases were detected. Furthermore, a dense microstructure and small grain size lead to a high breakdown electric field strength (EB) of 430 kV/cm of the NBCSTO ceramic, which also displays the features of relaxor ferroelectrics. Importantly, a high Wrec⁓5.84 J/cm3 along with a medium η⁓80 % were simultaneously achieved in the NBCSTO ceramic, as well as good energy-storage stability. Moreover, the NBCSTO ceramic exhibits both a high PD and a fast discharging speed. All the above results indicate that the NBCSTO ceramic may be potential eco-friendly material for capacitor used in the pulsed power systems.

Unleashing the potential of Mg2SiO4-based ceramics for millimeter-wave applications: Achieving ultra-low loss with enhanced temperature stability through heterovalent ion substitution

As 5G communication technology advances into millimeter-wave frequencies, the demand rises for microwave dielectric ceramics with low dielectric constant and low dielectric loss. In this regard, Mg2SiO4 emerges as one of the most promising candidates. Herein, Mg2-xGaxSi1-xAlxO4 (MGSA, x = 0∼0.03) ceramics were prepared by a solid-state reaction process employing heterovalent ion substitution strategy, achieving ultra-low loss and enhanced temperature stability of resonant frequency while maintaining low dielectric constant. The effects of the partial substitution of Ga3+ for Mg2+ and Al3+ for Si4+ in MGSA ceramics were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), Raman spectra, infrared reflectivity spectra, and combined with P–V–L bond theory analysis. XRD results revealed a solid solution formation, while SEM images highlighted microstructure variations with increasing x. Based on P–V–L theory, it was found that the dielectric constant is mainly affected by average bond ionicity Afi, while τf is mainly affected by bond energy E. The intrinsic loss determined Qf value, which is further validated by Raman and infrared spectra. The optimal performance for millimeter-wave applications was achieved at x = 0.01: εr = 6.95, τf = −37.7 ppm/oC, Qf = 244,800 GHz (at 27.15 GHz).

Effects of (Li0.5Nd0.5)2+ on the phase evolution, Raman spectra and microwave dielectric properties in CaO–Nd2O3–TiO2 ceramic

The rapid advancement of mobile communications technology is imposing greater demands on electronic components. Microwave dielectric ceramics with a high dielectric constant (ϵr ) are crucial for the miniaturization and integration of microwave devices. Herein, The perovskite-structured (Ca0.61Nd0.26)1−x (Li0.5Nd0.5) x TiO3 (0 ⩽ x ⩽ 0.8) microwave dielectric ceramics with high ϵr value were prepared by solid-state reaction method. The results demonstrated that the ϵr value reached its peak at x = 0.6, which was influenced by the bond valence at B-sites. The τ f and Q× f values decreased with increasing x value. Doping (Li0.5Nd0.5)2+ at A-sites led to an increase in the full width at half maximum of Raman peaks, indicating higher internal loss. A high dielectric constant and temperature-stable (Ca0.61Nd0.26)0.27(Li0.5Nd0.5)0.73TiO3 ceramic can be sintered with good microwave dielectric properties of ϵr = 129.4, Q× f= 2,787 GHz, and τ f = +1.9 ppm/°C.

Achieving large energy density and high efficiency in (Bi0.5Na0.5)0.7Sr0.3TiO3–Ba(Mg1/3Sb2/3)O3 ceramic

Recently, due to ultra-high energy density and exceptionally fast discharge time, high-performance dielectric capacitors have become a research hotspot in electric pulse power equipment. However, it is challenging to achieve a hige energy storage density and efficiency of ceramic worked in the area for capacitors. Herein, novel (1-x) (Bi0.5Na0.5)0.7Sr0.3TiO3-xBa(Mg1/3Sb2/3)O3 (xBMS, x = 0.08, x = 0.10, x = 0.12, x = 0.14) dielectric ceramics were prepared by a solid state reaction method. 0.10BMS ceramic has a large maximum polarization value of 37.1 μC/cm2 at 330 kV/cm, which achieves a high energy storage density of 4.42 J/cm3 and ultra-high efficiency of 93 %. Meanwhile, 0.10BMS ceramic has great energy storagy stability in the temperature range of 40–140 °C and the frequency range of 4–200 Hz. In addition, the sample also shows an fast t0.9 of 60.8 ns, high CD of 806.8 A cm−2, and PD of 48.41 MW/cm3. Therefore, 0.10BMS ceramic has potential application prospects in electronic devices.

Enhanced energy-storage performance in BNT-LST-based ceramics via polarization optimization and breakdown strength regulation

Dielectric storage ceramics are widely used in electronic products due to their speed charge-discharge rate. However, the low recoverable energy density, which is attributing to the high remanent polarization and low breakdown electric field, results in an inferior efficiency, which hinders their applications. Here, superior energy storage properties were achieved in the pseudo-cubic 0.5(Bi0.5Na0.5)TiO3–0.5(La0.1Sr0.8)TiO3-δ (BNT-0.5LST) ceramics at 323 kV/cm, and the recoverable energy density, energy efficiency, and breakdown strength in BNT-0.5LST ceramics were severally enhanced 10 times, 5.9 times and 1.3 times than those of BNT-0.1LST ceramics. Slim P-E loops and high polarization (28.13 μC/cm2) originated from the presence of polar nano-regions (PNRs), and the PNRs with weakly couple with each other decreased the remanent polarization. Large breakdown strength attributed to the broad band gap (3.302 eV) and refined grain (1.59 μm). Transmission electron microscopy proved the presence of PNRs in the pseudo-cubic matrix phase. The results have provided a novel route for fabricating the storage ceramics with the outstanding energy storage properties.

Ultrahigh Energy Storage Density and Efficiency of Lead-Free Dielectrics with Sandwich Structure.

Lead-free dielectric capacitors have attracted significant research interest for high-power applications due to their environmental benefits and ability to meet the demanding performance requirements of electronic devices. However, the development of lead-free ceramic dielectrics with outstanding energy storage performance remains a challenge. In this study, environmentally friendly ceramic dielectrics with sandwich structures are designed and fabricated to improve energy storage performance via the synergistic effect of different dielectrics. The chemical compositions of the outer and middle layers of the sandwich structure are 0.35BiFeO3 -0.65SrTiO3 and Bi0.39 Na0.36 Sr0.25 TiO3 , respectively. The experimental and theoretical simulation results demonstrate that the breakdown strength is over 700kVcm-1 for prepare sandwich structure ceramics. As a result, an ultrahigh recoverable energy storage density of 9.05Jcm-3 and a near-ideal energy storage efficiency of 97% are simultaneously achieved under 710kVcm-1 . Furthermore, the energy storage efficiency maintains high values (≥ 96%) within 1-100Hz and the power density as high as 188MWcm-3 under 400kVcm-1 . These results indicate that the designed lead-free ceramics with a sandwich structure possess superior comprehensive energy storage performance, making them promising lead-free candidates in the energy storage field.

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Li2TiO3-Based Solid Solution Ceramics with Lithium Fluoride Addition for Low-Temperature Co-Fired Ceramic Applications

Nowadays, low-temperature co-fired ceramic (LTCC) technology has become one of the main forms of manufacturing electronic devices. However, a majority of microwave dielectric ceramics are not suitable as LTCC materials due to their high sintering temperatures. Developing novel LTCC materials with good microwave dielectric properties is extremely urgent. In this paper, an LiF sintering aid was added to Li2Ti0.8(Co1/3Nb2/3)0.2O3 (LTCN) ceramics to explore new LTCC materials. The sintering behavior, microstructure and microwave dielectric properties of LTCN + x wt% LiF ceramics were investigated in detail. The results indicated that the addition of LiF increased the degree of disorder in the LTCN matrix, transforming it from a monoclinic to a cubic crystal system. The ceramics exhibited relatively dense and homogeneous microstructures at the sintering temperature of 950 °C as the LiF doping amount was not less than 2 wt%. By LiF doping, the quality factor (Q × f) value was significantly enhanced due to the improved microstructure. Meanwhile, the temperature coefficient of resonant frequency (τf) of LTCN ceramics was successfully regulated to the near zero value owing to the negative τf characteristic of LiF. Excellent microwave dielectric properties of dielectric constant (εr) = 19.01, Q × f = 144,890 GHz, τf = −1.52 ppm/°C were obtained when the sample doped 3 wt% LiF was sintered at 950 °C for 3 h. Furthermore, the good chemical compatibility of the LTCN-3 wt% LiF ceramic with silver electrodes suggested that the ceramic was a potential material for LTCC applications.

Design and Fabrication of Wideband Dielectric Resonator Antenna Using Low Loss Ultra‐Low Sintering Temperature Li6B4O9 Microwave Dielectric Ceramic for Wireless Communication Applications

AbstractLow dielectric constant (ɛr), high quality‐factor (Q × f), and temperature stable microwave dielectric ceramics with ultra‐low sintering temperature are the preferred choice of researchers for the development of low‐cost and high‐performance dielectric resonator antenna (DRA), which have wide application prospects for wireless communication technology. In this work, wideband DRAs fabricated using ultra‐low sintering temperature, low‐loss, and high‐quality Li6B4O9 microwave dielectric ceramics are reported. Li6B4O9 ceramic synthesized via solid‐state reaction at sintering temperature of 620 °C demonstrates excellent microwave properties with optimum ɛr = 5.95, high Q × f = 38,700@12.4 GHz, and thermal coefficient of the resonant frequency (TCF ≈ −68.6ppm/○C). For the first time, performance comparison of two Li6B4O9‐based cylindrical DRAs with different ceramic aspect (radius to height) ratios excited by slot coupled microstrip line is realized. In the first DRA with ceramic aspect ratio of 0.864, DRA HE11δ mode is excited and bandwidth of 20.01% , 95% radiation efficiency, and 6.3 dBi maximum gain is attained. In the second DRA with ceramic aspect ratio of 2.367, slot and dielectric resonator resonances are merged to attain wide bandwidth of 38.15% over which antenna broadside radiation performance is preserved. The proposed DRAs can be utilized for high‐capacity, high‐speed wireless communication applications.

Enhanced Dielectric and Mechanical Performances of the (La + Nb) Codoped TiO2/Silicone Rubber Composites

Silicone rubber (SR) has gained great interest because of its fast deformation response, low modulus, high rebound rate, and wide temperature application range. However, their development is hampered by the low dielectric constant. Adding dielectric ceramics may be a solution. Herein, (La + Nb) codoped TiO2/SR composites are fabricated and their properties are systematically tested. By adding codoped TiO2, the performances of the composites are enhanced. High permittivity (3.63) and low loss tangent (7.07 × 10−4) are gained in the SR composites with 30 wt% codoped TiO2. The evenly dispersed codoped TiO2 and the enhanced interfacial polarization effect can be responsible for this. The composites also exhibit enhanced tensile strength (565 kPa) and elongation (259%). In addition, the SR composites are thermally stable up to 415 °C. These superior properties can improve the electrodeformation performance of SR composites, which has great potential in the fields of flexible actuators, bionic flexible robots, next‐generation intelligent medical devices, and green energy harvesting.

Dielectric Properties of Compacts Sintered after High-Pressure Forming of Lithium Fluoride

High-pressure forming at 300 MPa and room temperature was applied before the sintering of a lithium fluoride (LiF) powder. The as-fired samples were tested as dielectrics and showed very interesting characteristics. The best sample, sintered at 750 °C for 8 h, had a relative permittivity of 12.1 and a loss tangent of 0.0006, both of them frequency-independent and temperature-independent up to at least 150 °C, and moreover, the volume DC resistivity was 27.4 × 1012 Ωm at room temperature. These parameters are comparable with oxide ceramics, processed at temperatures over 1300 °C, as for example, aluminum dioxide (Al2O3) or Y3Al5O12 (YAG). LiF material is advantageous because of its very low sintering temperature, which is only about one-half of typical oxide ceramic dielectrics.

B‐site internal‐strain regulation engineering of tungsten bronze structural dielectric ceramics

AbstractInternal strain is considered to be related to the dielectric loss of tungsten bronze structural ceramics, while its effects often cannot be effectively distinguished from non‐intrinsic factors. To quantitatively determine the influential mechanism of dielectric loss by internal strain, B‐site controllable co‐substituted (Al3+, Ga3+, and Sc3+) Ba4Nd9.33Ti18O54 ceramics with single phase were designed and synthesized, and the ratio is designed with the equivalent radius of substituted ions is equal to Ti4+. Through calibrating the global instability index, the relatively straightforward relationship between internal strain and Q×f value is established. As a result, a loss gradient (Q×f value from 8468 to 14311 GHz) and an almost stable real part of permittivity (εr ∼ 68 with near‐zero τf) can be obtained. Not only does it provide direct evidence for the effectiveness of internal strain control on dielectric loss, but also decouples three key parameters of microwave dielectric ceramics, which may be of great significance in future device physics, especially for all‐ceramic non‐Hermitian devices.

Temperature-stable Ba0.8Sr0.2CuSi2O6 microwave dielectric ceramics for LTCC application achieved with the addition of LBSCA and LBBS glass

Ba0.8Sr0.2CuSi2O6 ceramics have a low dielectric constant, which is useful for low-latency 5G communication. To enable the preparation of Ba0.8Sr0.2CuSi2O6 low-temperature co-fired ceramic (LTCC) materials, LBSCA and LBBS were used in this paper to reduce the sintering temperature of Ba0.8Sr0.2CuSi2O6. The effects of LBSCA and LBBS on the phase composition, densification, microscopic morphology, and vibrational characteristics of the ceramics were investigated by X-ray diffraction, scanning electron microscopy, density measurements, and Raman spectroscopy, and the causal factors influencing the microwave dielectric properties with the addition of glass were analyzed. It was found that 0.4 wt% LBSCA glass and 1 wt% LBBS glass reduced the sintering temperature to 925 °C, and these prepared ceramics had excellent microwave dielectric properties. The ceramic prepared with 0.4 wt% LBSCA glass had an εr value of 7.672, Q × f value of 37193 GHz, and τf value of −14.93 ppm/°C, while the ceramic prepared with 1 wt% LBBS glass had an εr value of 7.512, Q × f value of 32136 GHz, and τf value of −13.92 ppm/°C. The phase composition of the ceramics did not significantly change, indicating that neither glass reacted with the ceramics. The εr value was affected by both density and Raman shift, the trend in the Q × f values was consistent with the density, and the τf value decreased with increasing glass content, which was attributed to the liquid phase generated by the glass in the ceramic. In addition, co-firing these glass-doped ceramics with Ag at a low temperature resulted in good chemical compatibility. Combined with the near-zero τf, these results demonstrate the excellent promise of these two ceramics as alternative materials for LTCC microwave devices and their application in 5G communication.