NaTaO3 microwave dielectric ceramic a with high relative permittivity and as an excellent compensator for the temperature coefficient of resonant frequency

Wang, Kangguo; Zhou, Huanfu; Luan, Xiaowen; Hu, Sang; Zhou, Xiang; He, Sen; Wang, Xi; Zhou, Shicheng; Chen, Xiuli

doi:10.1016/j.ceramint.2020.08.114

Cited by 29 publications

(8 citation statements)

References 39 publications

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“…It is hard to prevent Na evaporation during a hightemperature heat treatment, so a certain amount of Na deficiency exists in the sample in most cases. [21][22][23] In this study, we succeeded to prepare two control groups, undoped NaTaO 3 and 1% Ti-doped NaTaO 3 , with different amounts of Na deficiencies. Through the comparison between them, a qualitative evaluation of Na deficiency can be made for samples with or without doping.…”

Section: Influence Of Na Deficiencymentioning

confidence: 99%

“…In this work, we have investigated the influence of Ti concentration on the conduction properties and found the optimal Ti concentration for the increase of the conductivity of Ti‐doped NaTaO 3 . On the other hand, it is widely acknowledged that the amount of Na is hard to be controlled when a high‐temperature heat treatment is involved in the preparation because of the volatilization of Na 21–23 . Considering this, the influence of Na deficiency was investigated in the present work.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it is widely acknowledged that the amount of Na is hard to be controlled when a high-temperature heat treatment is involved in the preparation because of the volatilization of Na. [21][22][23] Considering this, the influence of Na deficiency was investigated in the present work. In addition, the influence of phase transformation on the proton conductivity was also discussed.…”

Section: Introductionmentioning

confidence: 99%

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The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

et al. 2022

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NaTaO 3 shows significant proton conductivity and a high transport number of ionic conduction after being doped titanium (Ti). In this work, we aimed to determine the influence of sodium (Na) deficiency and Ti concentration in NaTaO 3 , for which NaTaO 3 samples with various Na deficiencies and Ti concentrations were prepared and characterized. The investigation was performed on microstructure, conductivity, transport number of ionic conduction, etc. Na deficiency was confirmed to decrease the conductivity of 1% Ti-doped NaTaO 3 , although it raises the conductivity of undoped NaTaO 3 . Summarizing the measured results of 1%-4% Ti-doped NaTaO 3 , a higher Ti concentration was found to significantly increase the proton conductivity of NaTaO 3 . However, when Ti is more than ∼3%, the higher concentration of Ti leads to a decrease in conductivity.Overall, ∼2% Ti was confirmed to be most beneficial to proton conductivity. The influence of phase transformation on proton conductivity was also discussed. In conclusion, precise control of Na amount is of great importance for the conduction properties of NaTaO 3 and ∼2% Ti is determined to be most beneficial to the conduction properties. In this case, through the adjustment of Ti concentration and control of Na deficiency, a bulk conductivity as high as 1.3 × 10 -3 S/cm at 600 • C and 7.8 × 10 -5 S/cm at 300 • C was realized with ∼2% Ti-doped NaTaO 3 in wet O 2 .

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Section: Influence Of Na Deficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

et al. 2022

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“…It is traditionally believed that the reasons for a frequency offset are the thermal deformation of materials and machining errors affecting device dimensions. Many studies have focused on synthesizing ceramic materials with low or even near-zero temperature coefficients [14][15][16][17]. Moreover, adequate studies have been conducted on the influence of errors in dimensions on waveguide components.…”

Section: Introductionmentioning

confidence: 99%

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

Wang,

Wei,

Lin

et al. 2023

Machines

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Ceramic waveguide components play a critical role in modern microwave semiconductor systems. For the first time, this work reports experimental results obtained when dielectric ceramics are abrasive-machined into waveguide components. This process will cause subsurface damage (SSD), resulting in a deviation in their working frequency which can degrade the performance of the system. For a substrate-integrated waveguide (SIW) resonator working at 10.1 GHz, SSD with a depth of 89 um can cause a maximum frequency offset of 20.2%. For a mm wave component working at 70 GHz, the corresponding frequency offset could increase to 169%. Three resonator SIW filters with SSD are studied, and the results demonstrate that the frequency offset induced by SSD can reduce the pass rate of the filters from 95.4% to 0%. A theoretical analysis is performed to reveal the mechanism and to offer a quantitative estimation of the limiting range of the offset caused by SSD. Feasible methods for reducing the offset caused by SSD, such as structure design, processing optimization, and material reinforcement, are discussed.

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“…NaTaO 3 is an early ferroelectric compound with a perovskite structure [14,15]. Wang et al [16] reported that NaTaO 3 ceramics sintered at 1550 ℃ exhibit extraordinary dielectric properties such as dielectric permittivity ε r = 113.76, Q × f = 8824 GHz, and τ f = +645 ppm/℃, and were used to regulate the microwave dielectric properties of MgTiO 3 . A near-zero frequency temperature coefficient was obtained for 0.92MgTiO 3 -0.08NaTaO 3 ceramics.…”

Section: Introduction mentioning

confidence: 99%

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Tang,

Yang,

et al. 2023

Journal of Advanced Ceramics

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A novel Na 1−x K x TaO 3 (x = 0, 0.025, 0.05, 0.075, 0.1, and 0.15) ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method. All samples were determined to be pure phase orthorhombic NaTaO 3 structure of space group Pmcn, and larger grain and lower porosity were observed after adding an appropriate amount of K + ions. The Q × f value is majored by the packing fraction and grain size, while the value of τ f is influenced by Ta-O bond valence. The Na 0.95 K 0.05 TaO 3 ceramic possesses excellent dielectric properties of ε r = 164.29, Q × f = 9091 GHz (f = 3.15 GHz), tanδ = 3.46×10 -4 , τ f = +809.52 ppm/℃, sintered at 1550 ℃. Compared with NaTaO 3 ceramics, the Na 1−x K x TaO 3 ceramics prepared in this study demonstrate higher dielectric constants and higher positive temperature coefficients, which are promising for device miniaturization and τ f compensators.

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NaTaO3 microwave dielectric ceramic a with high relative permittivity and as an excellent compensator for the temperature coefficient of resonant frequency

Cited by 29 publications

References 39 publications

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

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NaTaO3 microwave dielectric ceramic a with high relative permittivity and as an excellent compensator for the temperature coefficient of resonant frequency

Cited by 29 publications

References 39 publications

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO3−δ

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO3−δ

Microwave Frequency Offset Induced by Subsurface Damage in Abrasive-Machined Semiconductor Ceramic Waveguide

A novel Na 1− x K x TaO 3 perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient

Contact Info

Product

Resources

About

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

The influence of sodium deficiency and titanium doping concentration on conduction properties in NaTaO₃₋_δ

A novel Na _{1−
x}K _xTaO ₃ perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient