Sintering behavior, microwave dielectric properties, and chemical bond features of novel low-permittivity Cu3(PO4)2 ceramic with low-loss

Feng, Zhanbai; Gui, Weihua; Kimura, Hideo; Zhang, Yuping; Zhou, Tianhao; Dehan, Li; Yang, Chen; Teng, Xinying; Wu, Haitao

doi:10.1016/j.ceramint.2022.05.393

Cited by 17 publications

(6 citation statements)

References 46 publications

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“…The large deviation (20%-23%) between ε r and ε th may be due to the strong covalency of the P-O bond, which can be found in other phosphates [11,17]. Notably, ε r of the LiLn(PO 3 ) 4 ceramics remains stable at approximately 5.10, which is lower than that of the majority of phosphates, such as A 2 P 2 O 7 (A = Ca, Sr, Ba, Mg, Zn, Mn) [55], LnPO 4 (Ln = La, Ce, Nd, Sm, Tb, Dy, Y, Yb) [17], LiBPO 4 (B = Mg, Ni, Zn, Mn, Ca) [23,[26][27][28]56], A 3 (PO 4 ) 2 (A = Ca, Sr, Ba, Mg, Zn, Ni, Cu) [8], and LiB(PO 3 ) 3 (B = Sr, Ca) [11], which are listed in Table 7. Therefore, LiLn(PO 3 ) 4 ceramics with low ε r exhibit potential applications as substrate materials for high-frequency communication.…”

Section: Dielectric Properties and Structure-property Relationshipsmentioning

confidence: 99%

“…The τ f value can be further adjusted for practical applications by a compensator with positive τ f . To avoid a significant increase in ε r , low dielectric constant compensators, such as Sr 3 (PO 4 ) 2 ceramics, should be prioritized for selection [8]. Notably, these values decrease linearly for different Ln-site atoms.…”

Section: Dielectric Properties and Structure-property Relationshipsmentioning

confidence: 99%

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Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Tian,

Zhang,

Zhang

et al. 2024

Journal of Advanced Ceramics

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The development of dielectric materials with low permittivity and low loss is a great challenge in wireless communication. In this study, LiLn(PO 3 ) 4 (Ln = La, Sm, Eu) ceramic systems were successfully prepared using the traditional solid-state method. X-ray diffraction analysis indicated that the LiLn(PO 3 ) 4 ceramics crystallized in a monoclinic structure when sintered at 850-940 ℃. The characteristic peak shifted to higher angles with variations in the Ln element, which was ascribed to a reduction in the cell volume. Further analysis by structure refinement revealed that the reduction in the cell volume resulted from the decrease in chemical bond lengths and the compression of [LiO 4 ] and [PO 4 ] tetrahedra. Remarkably, the LiLn(PO 3 ) 4 ceramic system displayed exceptional performance at low sintering temperatures (910-925 ℃), including a high quality factor (Q•f) of 41,607-75,968 GHz, low temperature coefficient of resonant frequency (τ f ) ranging from −19.64 to −47.49 ppm/℃, low permittivity (ε r ) between 5.04 and 5.26, and low density (3.04-3.26 g/cm 3 ). The application of Phillips-van Vechten-Levine (P-V-L) theory revealed that the increased Q•f value of the LiLn(PO 3 ) 4 systems can be attributed to the enhanced packing fraction, bond covalency, and lattice energy, and the stability of τ f was associated with the increase in the bond energy. Furthermore, a prototype microstrip patch antenna using LiEu(PO 3 ) 4 ceramics was fabricated. The measurement results demonstrated excellent antenna performance with a bandwidth of 360 MHz and a peak gain of 5.11 dB at a central frequency of 5.08 GHz. Therefore, low-ε r LiLn(PO 3 ) 4 ceramic systems are promising candidates for microwave/millimeter-wave communication.

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Section: Dielectric Properties and Structure-property Relationshipsmentioning

confidence: 99%

Section: Dielectric Properties and Structure-property Relationshipsmentioning

confidence: 99%

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Tian,

Zhang,

Zhang

et al. 2024

Journal of Advanced Ceramics

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“…These specialized ceramics find wide‐ranging utility in the field of communication, serving as essential components such as resonators, filters, and dielectric antennas 1,2 . Notably, the pursuit of microwave dielectric ceramics possessing specific attributes such as an optimal relative dielectric constant ( ε r ), a high‐quality factor ( Q × f ), and a near‐zero temperature coefficient of resonant frequency ( τ f ) has gained paramount significance 3–6 . A lower relative dielectric constant holds the promise of reducing signal transmission delays, thereby mitigating heat generation within the system.…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Li,

Liang,

Zhang

et al. 2024

J Am Ceram Soc.

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This study investigates NaY9Si6O26 ceramics prepared through the solid‐phase method, focusing on their microwave dielectric properties and crystallographic characteristics. X‐ray diffraction analysis reveals a hexagonal crystal structure for NaY9Si6O26 ceramics within the P63/m (176) space group. Rietveld refinement analysis precisely determines the lattice constants as a = b = 9.3423 Å, c = 6.7524 Å, and a unit cell volume of V = 510.3877 Å3. Additionally, Raman spectroscopy unveils a noteworthy correlation between the quality factor and the full width at half maximum of the A1g(O) mode at 878 cm−1. The structural attributes, including lattice fringes and diffraction patterns of hexagonal NaY9Si6O26 ceramics, are elucidated through transmission electron microscopy. Of significance are the microwave dielectric properties of NaY9Si6O26 ceramics sintered at 1465°C, revealing a relative permittivity (εr) of 10.42, an impressive Q × f product of 33 766 GHz (at f = 11.14 GHz), and a temperature coefficient of resonant frequency (τf) of −28.7 ppm/°C. This comprehensive investigation contributes to the understanding of both the structural and microwave dielectric characteristics of NaY9Si6O26 ceramics, with potential applications in advanced electronic devices.

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“…Low-permittivity microwave dielectric ceramics are widely used in microwave communications, radar systems, radiofrequency technology, and other fields. [1][2][3][4][5][6] This is due to their unique electrical and thermal properties, such as low and stable dielectric constant (ε r ), high quality factor (Q×f), and good insulation properties. [7][8][9][10] These characteristics lead to low signal losses and small phase shift errors in highfrequency microwave transmission, improving the quality of communication and the transmission rate.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

Wang,

Shi,

Lin

et al. 2024

J. Electron. Mater.

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Mg 1+x Co 1−x SiO 4 (x = 0-0.2) microwave dielectric ceramics were prepared via a solid-phase reaction method. X-ray diffraction (XRD) data revealed a single-phase structure for these ceramics, with no phase changes with increasing Mg content, and Mg 1+x Co 1−x SiO 4 (x = 0-0.2) possessed an olivine structure. X-ray diffraction (XRD) patterns were refined via the Rietveld method to obtain crystal structure information. P-V-L bond theory was applied to analyze the crystal structure changes. Scanning electron microscopy (SEM) images highlighted a dense and uniform surface grain distribution with scarce pores. Raman spectroscopy was employed to characterize the impact of lattice vibrations on the Q×f factor. Excellent microwave dielectric properties were exhibited by the MgCoSiO 4 ceramics sintered at 1250 °C for 4 h (ε r = 7.17, Q×f = 46120 GHz, and τ f = −61.7 ppm/°C) and the Mg 1+x Co 1−x SiO 4 (x = 0.05-0.2) ceramics sintered at 1400 °C (ε r = 6.9, Q×f = 118575 GHz, and τ f = −47.7 ppm/°C).Keywords Mg 1+x Co 1−x SiO 4 (x = 0-0.2) ceramics • P-V-L bond theory • Si-based garnet structure

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Sintering behavior, microwave dielectric properties, and chemical bond features of novel low-permittivity Cu3(PO4)2 ceramic with low-loss

Cited by 17 publications

References 46 publications

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

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Sintering behavior, microwave dielectric properties, and chemical bond features of novel low-permittivity Cu3(PO4)2 ceramic with low-loss

Cited by 17 publications

References 46 publications

Low-permittivity LiLn(PO 3) 4 (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Low-permittivity LiLn(PO 3) 4 (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY9Si6O26 ceramic

Modulation of the Microwave Dielectric Properties of Si-Based Olivine Structured Ceramics Through the Variation of A-Site Ions

Contact Info

Product

Resources

About

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Low-permittivity LiLn(PO ₃) ₄ (Ln = La, Sm, Eu) dielectric ceramics for microwave/millimeter-wave communication

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY₉Si₆O₂₆ ceramic