Preparation and microwave dielectric properties of Ca 0.6 La 0.8/3 (Sn x Ti 1−x )O 3 ceramics

Yan, Yangxi; Li, Zhimin; Zhang, Maolin; Sun, Peng; Xu, Yonghao

doi:10.1016/j.ceramint.2017.03.154

Cited by 17 publications

(5 citation statements)

References 21 publications

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“…Compared with the CNT ceramic, less tiny grains were distributed around the large grains in the CNT + Sn ceramic. It is reported that SnO 2 addition with few amounts could promote the grain growth in Ca 0.6 La 0.8/3 TiO 3 ceramics . Similarly, the tiny grains became less, and grain distribution was compact for the CNT + Sn ceramic.…”

Section: Resultsmentioning

confidence: 93%

“…It is reported that SnO 2 addition with few amounts could promote the grain growth in Ca 0.6 La 0.8/3 TiO 3 ceramics. 20 Similarly, the tiny grains became less, and grain distribution was compact for the CNT + Sn ceramic. Furthermore, the variation in bulk density revealed that the large grain microstructure contributed to the densification in CNTM ceramics.…”

Section: Resultsmentioning

confidence: 99%

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Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

et al. 2018

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We investigated the structure and antireduction of Ti 4+ in orthorhombic perovskite Ca 0.61 Nd 0.26 TiO 3 (CNT) ceramic by doping with three different additives (Cr 2 O 3 , MnO 2 , and SnO 2 ). The X-ray diffraction patterns showed that the main phase of orthorhombic perovskite was formed in all the samples. In addition, the substitution of M (M = Cr 3+ , Mn 4+ , Sn 4+ ) for Ti 4+ resulted in the oxygen octahedral distortion and changes of order degree of B-site, which was confirmed by Raman spectra. The ε r and τ f values were concerned with the average ionicity of B–O bond f i (B-ave) and the linear expansion coefficient α, respectively. The X-ray photoelectron spectra indicated that three different additives could restrain the reduction of Ti 4+ , which was beneficial to the improvement of the Q × f value for CNT ceramic. High Q × f value of 16 123 GHz was obtained in the CNT + 1 mol % Cr 2 O 3 ceramic compared with Q × f value of 11 207 GHz in pure CNT ceramic.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

et al. 2018

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“…Forming a solid solution with SnO 2 is expected as an alternative approach to improve the microwave dielectric characteristics of HfO 2 -based ceramics. [11][12][13][14] Though it is difficult to yield dense ceramics, SnO 2 exhibits excellent microwave dielectric characteristic 15 : ε r = 5.27, Qf = 89 300 GHz (at 14.5 GHz), and τ f = −26.7 ppm/ • C. Therefore, it should be an interesting issue to investigate ceramics in HfO 2 -SnO 2 binary system and the variation tendency of microwave dielectric characteristics together with the structure evolution.…”

Section: Introductionmentioning

confidence: 99%

“…The primary issue for these materials is the relatively large negative τ f , accompanied by a significant decrease in Qf value with further increasing Ti‐substitution. Forming a solid solution with SnO 2 is expected as an alternative approach to improve the microwave dielectric characteristics of HfO 2 ‐based ceramics 11–14 . Though it is difficult to yield dense ceramics, SnO 2 exhibits excellent microwave dielectric characteristic 15 : ε r = 5.27, Qf = 89 300 GHz (at 14.5 GHz), and τ f = −26.7 ppm/°C.…”

Section: Introductionmentioning

confidence: 99%

Structure evolution and microwave dielectric characteristics of Hf₁₋_xSn_xO₂ ceramics

Ding,

Huang,

et al. 2024

J Am Ceram Soc.

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High Q (Hf1−xSnx)O2 ceramics were prepared via a standard solid‐state reaction route, and the microwave dielectric characteristics were investigated systematically together with the structure evolution. With increasing x, the structure changed from HfO2 (monoclinic in space group P21/c, x = 0 and 0.03) to Hf0.77Sn0.23O2 (orthorhombic in space group Pbcn, x = 0.23), while the two‐phase structure: HfO2 major phase and Hf0.77Sn0.23O2 secondary phase, was determined for x = 0.05–0.21, and Hf0.77Sn0.23O2 major phase combined with SnO2 tetragonal secondary phase in space group P42/mnm was confirmed for x = 0.30–0.40. The Qf value was significantly increased from 24,500 to 167,650 GHz by Sn‐substitution, and the best combination of microwave dielectric characteristics was obtained in Hf0.77Sn0.23O2 ceramics: εr = 17.2, Qf = 167 650 GHz at 9.6 GHz and 230 710 GHz at 26.1 GHz, and τf = −52.6 ppm/°C. The dielectric loss was deeply linked with the structure stability and lattice‐distortion. Also, the phase composition, the bond strength, as well as the degree of covalency, had a tight connection with dielectric loss. The present ceramics were expected to be the promising candidates as low‐εr microwave dielectric ceramics.

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“…3 [358-364], Zn 2 SnO 4 [365], Li 3 NbO 4 [248], Ca(Mg 1/3 Nb 2/3 )O 3 [366], Sm 0.9 Nd 0.1 AlO 3 [367], Na 0.5 Nd 0.5 TiO 3 [368], Nd(Mg 1/2 Ti 1/2 )O 3 [369,370], Bi 0.5 Na 0.5 TiO 3 [371], 3CaO-Re 2 O 3 -2WO 3 system [372], Ba 0.6 Sr 0.4 La 4 Ti 4 O 15[373], La 2 MgGeO 6[374], (Ca 0.8 Sr 0.2 )(Sn x Ti 1-x )O 3[375], Ca 0.7 Ti 0.7 La 0.3 (Al 0.3-x Ga x )O 3[376], Ca (1-x) Nd 2x/3 TiO 3[377], Ca 0.6 La 0.2667 TiO 3[378], Ca 0.6 La 0.267 Ti 1-x (Nb 0.5 Ga 0.5 ) x O 3[379], Ca 0.6 Nd 0.8/3 TiO 3 -(Li 0.5 Nd 0.5 )TiO 3[380], Ca 0.4-x Mg x Sm 0.4 TiO 3[381], CaTi 1-x (Nb 0.5 Ga 0.5 ) x O 3[382], Ca 0.66 Ti 0.66 Sm 0.34 Al 0.34 O 3[383], Ca 0.66 Ti 0.66 Nd 0.34 Al 0.34 O 3[384], CaTi 1-x (Al 0.5 Nb 0.5 ) x O 3[385,386], Ca 0.6 La 0.8/3 (Sn x Ti 1-x )O 3[387], Ca (1-3x/2) Ce x TiO 3[388], Ca 0.35 Li 0.25 Nd 0.35 Ti 1-x (Zn 1/3 Ta 2/3 ) x O 3 [389], Ca 0.61 Nd 0.26 Ti 1-x Cr x O 3…”

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confidence: 99%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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Preparation and microwave dielectric properties of Ca 0.6 La 0.8/3 (Sn x Ti 1−x )O 3 ceramics

Cited by 17 publications

References 21 publications

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

Structure evolution and microwave dielectric characteristics of Hf₁₋_xSn_xO₂ ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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Preparation and microwave dielectric properties of Ca 0.6 La 0.8/3 (Sn x Ti 1−x )O 3 ceramics

Cited by 17 publications

References 21 publications

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

Structure evolution and microwave dielectric characteristics of Hf1−xSnxO2 ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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Structure evolution and microwave dielectric characteristics of Hf₁₋_xSn_xO₂ ceramics