Microwave dielectric properties of 0.2SrTiO3-0.8Ca0.61Nd0.26Ti1−xAl4x/3O3 ceramics

Qu, Jingjing; Liu, Fei; Yuan, Changlai; Liu, Xinyu; Chen, Guohua

doi:10.1016/j.mseb.2014.10.005

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…substitution at B-site for Ti 4? was proved to improve the Q 9 f values and lower s f values of 0.2SrTiO 3 -0.8Ca 0.61 Nd 0.26 Ti 1-x Al 4x/3 O 3 ceramics effectively [15]. It was found that increasing of Q 9 f would be expected by annealing treatment.…”

Section: Introductionmentioning

confidence: 91%

Microstructure and microwave dielectric properties of BaNd2Ti4−xAl4x/3O12 ceramics

Chen

Kang

et al. 2016

J Mater Sci: Mater Electron

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Using the solid-state ceramic route, BaNd 2 Ti 4-x Al 4x/3 O 12 (0 B x B 0.15) ceramics were prepared, and the structure, microstructure, and microwave dielectric properties were investigated. The XRD results suggest the formation of single solid solution phase with orthorhombic structure for all studied compositions (0 B x B 0.15) and the unit cell volume decreases linearly with x. The SEM results also show no evidence of secondary phase. A small amount of substitutions improves quality factor (Q 9 f) and the temperature coefficient of resonant frequency (s f ) but leads to a decrease of the permittivity. The s f value is found to decrease with increasing substitutions because of the declination of tolerance factor (t). And the s f can be adjusted from 79.5 to 38.3 ppm/°C with increment of substitutions. Finally, excellent dielectric properties are achieved as x = 0.1 sintered at 1320°C for 4 h in air: e r = 86.1, Q 9 f = 9702 GHz, s f = 43.1 ppm/°C. The Q 9 f value is strongly affected by the annealing process. The samples annealed at 1100°C for 15 h exhibit the best microwave dielectric properties.

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Section: Introductionmentioning

confidence: 91%

Microstructure and microwave dielectric properties of BaNd2Ti4−xAl4x/3O12 ceramics

Chen

Kang

et al. 2016

J Mater Sci: Mater Electron

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“…Solid solution of Ba x Mg 1-x Ti 0.95 Sn 0.05 O 3 [416] and local 1:1 ordering in B-site of Sr(Ga 0.5 Nb 0.5 ) 1-x Ti x O 3 was verified by TEM and Raman spectroscopy, and the decline of quality factor stemmed from the anharmonicity by Ti substitution [417]. 0.2SrTiO 3 -0.8Ca 0.61 Nd 0.26 Ti 1-x Al 4x/3 O 3 ceramics also reached a near zero τ f value with x = 0.5 [418].…”

Section: Abo 3 Formulamentioning

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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“…The Ca 0.61 Nd 0.26 TiO 3 (CNT) ceramic with properties of ε r ∼ 108, Q × f ∼ 17 200 GHz, and τ f ∼ +270 ppm/°C, originating from CaTiO 3 ceramic is thought to be potential and suitable MWDCs applied in the high-frequency circuit . For the needs of practical application, many literatures concentrated on tuning the τ f value of the CNT ceramic to near zero by substitution of A or B site in perovskite structure , or combining other ceramics with opposite τ f value. − Nevertheless, little attention has been attached to the improvement on Q × f values by preventing reduction of Ti 4+ to Ti 3+ . Two valence states of Ti exist in many Ti-based MWDCs sintered in an air atmosphere or under low oxygen partial pressure, such as TiO 2 , BaZn 2 Ti 4 O 11 , Ba 4.2 Sm 9.2 Ti 18 O 54 , Na 0.5 Sm 0.5 TiO 3 , and so on.…”

Section: Introductionmentioning

confidence: 99%

“…3 , Nd 2 O 3 , TiO 2 , Cr 2 O 3 , MnO 2 , and SnO 2 powderswere proportionately weighed in accordance with Ca 0.61 Nd 0.26 TiO 3 + 1 mol % M (M = Cr 2 O 3 , MnO 2 , SnO 2 ) (CNTM) chemical formula. Like traditional solid-state reaction method, the raw materials need to be ball mixed with deionized water using planetary.…”

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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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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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Microwave dielectric properties of 0.2SrTiO3-0.8Ca0.61Nd0.26Ti1−xAl4x/3O3 ceramics

Cited by 14 publications

References 31 publications

Microstructure and microwave dielectric properties of BaNd2Ti4−xAl4x/3O12 ceramics

Microstructure and microwave dielectric properties of BaNd2Ti4−xAl4x/3O12 ceramics

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

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

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