Characterization of structural and electrical properties of Ca0.61Nd0.26TiO3 ceramic tailored by complex ions (Al0.5Nb0.5)4+

Xiong, Zhe; Zhang, Xing; Fang, Zixuan; Wu, Wenjuan; Li, Lezhong; Tang, Bin; Zhang, Shuren

doi:10.1016/j.jallcom.2021.163234

Cited by 14 publications

(4 citation statements)

References 73 publications

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“…Therefore, the demand for dielectric filters will increase exponentially, which will lead to extensive research in microwave dielectric ceramics with a medium dielectric constant. [6][7][8] CaTiO 3 is a typical perovskite-type compound with an orthorhombic structure (Pbnm). The rattling cation effect and distortion of the [TiO 6 ] octahedron make it show a high dielectric constant, a moderate quality factor, and a large positive temperature coefficient of resonant frequency (ε r = 170, Qf = 6000 GHz, and τ f = +744 ppm/ • C).…”

Section: Introductionmentioning

confidence: 99%

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Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Song

Yin

Zou³

et al. 2022

J Am Ceram Soc.

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1 − x)CaTiO 3 -xLa(Mg 2/3 Nb 1/3 )O 3 (CT-LMN; x = 0-1.0) solid solutions were prepared by a solid-state reaction method. A phase transition from a disordered orthorhombic (Pbnm) structure to a 1:1 ordered monoclinic (P21/n) structure was observed when x increased from 0.5 to 0.6. Some new parameters, such as ionic polarizability in a polyhedron and ionic packing fraction in a polyhedron, were defined to explain the structure-property relationships of CT-LMN ceramics based on the Rietveld refinement results. The measured dielectric constant (ε r-mea ) decreased monotonically with B-site ionic polarizability in the [BO 6 ] octahedron (𝛼 T D (B)∕𝑉 [B] ) when the x value increased from 0 to 1.0. The quality factor (Qf) was dominated by the packing fraction of B-site cations in the [BO 6 ] octahedron (PF [B] ), and both presented an increasing trend. The temperature coefficient of resonant frequency (τ f ) decreased from +588.5 to −79.7 ppm/ • C, and it was highly correlated to the tolerance factor (t), 𝛼 𝑇 𝐷 (B)∕𝑉 [B] and PF [B] . The highest Qf value is obtained at x = 1.0 when sintered at 1600 • C for 10 h with ε r = 23.65 ± 0.2, Qf = 33517 ± 2000 GHz (@7.8 GHz), and τ f = −79.7 ± 2.0 ppm/ • C. Moreover, a near-zero τ f value was achieved at x = 0.4 with ε r = 43.52 ± 0.2, Qf = 17239 ± 2000 GHz (@5.2 GHz), and τ f = −10.2 ± 2.0 ppm/ • C.

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Section: Introductionmentioning

confidence: 99%

“…Moreover, the air cavity filters will be replaced by dielectric resonant filters as a result of the demand for device miniaturization. Therefore, the demand for dielectric filters will increase exponentially, which will lead to extensive research in microwave dielectric ceramics with a medium dielectric constant 6–8 …”

Section: Introductionmentioning

confidence: 99%

Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Song

Yin

Zou³

et al. 2022

J Am Ceram Soc.

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“…Among these, for microwave applications, the

{\tau }_f

plays a crucial role for maintaining optimal performance of microwave devices. It directly influences the stability and reliability of ceramic components, and adversely affects the performance of the applied systems 9 . These attributes are indispensable for the practical implementation of ULTCC technology, triggering an escalating interest in low/ultralow temperature sintered ceramics as the industry strives to fulfill the increasing demand for miniaturization and reliability of microwave devices.…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of (Na_0.5Bi_0.5)MoO₄–BaMoO₄ composite ceramics with ultralow sintering temperature

Alzakree,

Wang,

Shehbaz

et al. 2024

J Am Ceram Soc.

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The rapidly ever‐growing wireless communication demands development of low loss, ultralow sintering temperature dielectric ceramics with excellent microwave properties. In this work, fabrication and properties of novel microwave dielectric composite ceramics (1 − x)(Na0.5Bi0.5)MoO4–xBaMoO4 (x = 0.3–0.6), in short as ((1 − x)NBM–xBM), synthesized via solid‐state reaction method with an ultralow sintering temperature is reported. X‐ray diffraction analysis confirms the coexistence of both (Na0.5Bi0.5)MoO4 and BaMoO4 scheelite phases. Scanning electron microscopy analysis demonstrated dense microstructures of ceramics sintered at 650°C and 700°C. The dielectric properties of (1 − x)NBM–xBM (x = 0.3–0.6) ceramic are significantly tailored by incorporation of BaMoO4. With the increase in x from 0.3 to 0.6, the (1 − x)(Na0.5Bi0.5)MoO4–xBaMoO4 displays noticeable change in microwave permittivity (varying from 25.4 to 16.6), quality factor values, and temperature coefficient of frequency (range tunable from +37.6 ppm/°C to −14.2 ppm/°C). The microwave dielectric ceramic, 0.5(Na0.5Bi0.5)MoO4–0.5BaMoO4, has optimum dielectric properties (, = 15 164 GHz, τf = −0.2 ppm/°C) at sintering temperature of 650°C. The dielectric resonator antenna designed using (1 − x)(Na0.5Bi0.5)MoO4–xBaMoO4 ceramics demonstrated excellent radiation performance at resonance frequency of 5.905 GHz, gain of ∼5.8 dBi and 140 MHz bandwidth, which validates its microwave applications utilization within the field of ultralow temperature cofired ceramics technology.

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“…It is noted that Ca 1-x Nd 2x/3 TiO 3 ceramics possess high ε r value (⩾100) and Q × f value (⩾10 000 GHZ), meanwhile, the τ f value of Ca 1-x Nd 2x/3 TiO 3 ceramics are drastically reduced from +800 ppm/ • C to about +250 ppm/ • C in the range of x = 0.2 ∼ 0.5 [4,24,25]. Our group has made efforts on the regulation of structure and dielectric performance for Ca 0.61 Nd 0.26 TiO 3 (x = 0.39) ceramic by carrying out the substitution at B-site due to relatively excellent dielectric properties of Ca 0.61 Nd 0.26 TiO 3 ceramic in comparison to other composition of Ca 1-x Nd 2x/3 TiO 3 [23,[26][27][28]. Results showed that although a small amount of substituting ions at B-sites could significantly improve the Q × f value and slightly decline the τ f value for Ca 0.61 Nd 0.26 TiO 3 ceramic, the ε r value was lowered and τ f value maintained at a high level (>+200 ppm/ • C).…”

Section: Introductionmentioning

confidence: 99%

Effects of (Li_0.5Nd_0.5)²⁺ on the phase evolution, Raman spectra and microwave dielectric properties in CaO–Nd₂O₃–TiO₂ ceramic

Zhang,

Xiong,

Tang

et al. 2023

J. Phys. D: Appl. Phys.

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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.

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Characterization of structural and electrical properties of Ca0.61Nd0.26TiO3 ceramic tailored by complex ions (Al0.5Nb0.5)4+

Cited by 14 publications

References 73 publications

Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Microwave dielectric properties of (Na_0.5Bi_0.5)MoO₄–BaMoO₄ composite ceramics with ultralow sintering temperature

Effects of (Li_0.5Nd_0.5)²⁺ on the phase evolution, Raman spectra and microwave dielectric properties in CaO–Nd₂O₃–TiO₂ ceramic

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Characterization of structural and electrical properties of Ca0.61Nd0.26TiO3 ceramic tailored by complex ions (Al0.5Nb0.5)4+

Cited by 14 publications

References 73 publications

Structural evolution and microwave dielectric properties of CaTiO3–La(Mg2/3Nb1/3)O3 ceramics

Structural evolution and microwave dielectric properties of CaTiO3–La(Mg2/3Nb1/3)O3 ceramics

Microwave dielectric properties of (Na0.5Bi0.5)MoO4–BaMoO4 composite ceramics with ultralow sintering temperature

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

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Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Structural evolution and microwave dielectric properties of CaTiO₃–La(Mg_2/3Nb_1/3)O₃ ceramics

Microwave dielectric properties of (Na_0.5Bi_0.5)MoO₄–BaMoO₄ composite ceramics with ultralow sintering temperature

Effects of (Li_0.5Nd_0.5)²⁺ on the phase evolution, Raman spectra and microwave dielectric properties in CaO–Nd₂O₃–TiO₂ ceramic