Excellent temperature–humidity stability in (Tb1/2Ta1/2) Ti1-O2 ceramics with colossal permittivity and low–loss tangent

Thongyong, Nateeporn; Sreejivungsa, Kaniknun; Kawee, Phornpun; Chanlek, Narong; Takesada, Masaki; Thongbai, Prasit

doi:10.1016/j.jallcom.2024.174341

Journal of Alloys and Compounds

2024

DOI: 10.1016/j.jallcom.2024.174341

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Excellent temperature–humidity stability in (Tb1/2Ta1/2) Ti1-O2 ceramics with colossal permittivity and low–loss tangent

Nateeporn Thongyong,

Kaniknun Sreejivungsa,

Phornpun Kawee

et al.

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Cited by 3 publications

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Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Li,

Chen,

Tian

et al. 2025

Materials Research Bulletin

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Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Li,

Chen,

Tian

et al. 2025

Materials Research Bulletin

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Enhanced humidity sensing properties of Ta2O5 and ITO doped rutile-TiO2 porous ceramics

Wongsricha,

Sreejivungsa,

Thanamoon

et al. 2024

Sci Rep

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In this study, we investigated the humidity sensing properties of TiO 2 -based ceramics doped with tantalum pentoxide (Ta 2 O 5 ) and indium tin oxide (ITO). Pure TiO 2 , 1%Ta-doped TiO 2 (1%TTO), 1%ITO-doped TiO 2 (1%ISTO), and 1%(Ta 2 O 5 + ITO) co-doped TiO 2 (1%ISTTO) ceramic samples were obtained by sintering at 1200 °C for 3 h. The rutile phase was observed in all samples. The lattice parameters of the single and co-doped samples were larger than those of pure TiO 2 , confirming the substitution of dopants. Porosity was observed in all ceramics. The mean grain sizes of all doped samples were significantly reduced compared to undoped TiO 2 . A homogeneous element dispersion was observed in the 1%TTO and 1%ISTTO ceramics, while segregation particles of related In-rich elements was observed in the 1%ISTO ceramic. Giant dielectric properties were not achieved in any samples due to the porosity. Nevertheless, excluding the undoped TiO 2 , the dielectric properties of all porous ceramics varied significantly with changes in humidity. The 1%ISTTO ceramic demonstrated superior humidity sensing properties, including a low maximum hysteresis error of 3.6% at 10 2 Hz. In contrast, the 1% TTO and 1% ISTO ceramics showed higher maximum hysteresis errors of 7.2% and 19.8%, respectively. Notably, the response and recovery times were 7.05 ± 0.18 and 2.48 ± 0.39 min, respectively, with good repeatability. This improvement is likely due to the synergistic effect of oxygen vacancies and defects on the surface, enhancing the humidity sensing properties of the 1% ISTTO ceramic, coupled with its optimal microstructure due to its lowest porosity and grain size.

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Stability of giant dielectric properties in co‐doped rutile TiO₂ ceramics under temperature and humidity

Wongsricha,

Harnchana,

Srepusharawoot

et al. 2024

IET Nanodielectrics

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This research investigated the influence of temperature and humidity on the giant dielectric (GD) properties of 1% indium tin oxide and 1% Ta2O5 co‐doped TiO2 ceramics sintered at different temperatures. A single phase of rutile TiO2 was obtained in all sintered samples. The mean grain size increased with higher sintering temperatures, resulting in ceramics with a relative density exceeding 98%. A uniform dispersion of dopants and major elements was achieved. Remarkably, the dielectric constant increased significantly from 2 × 103 to 3.7 × 104 with a rising sintering temperature, primarily due to the enlarged grain size. Concurrently, the authors observed low loss tangents, ranging from tanδ≈0.016 to 0.024 at 1 kHz. Slight variations in the dielectric constant were observed with temperature from room temperature up to 210°C, while maintaining remarkably low tanδ. The GD properties were attributed to space charge polarisation at internal interfaces and defect dipoles. Further research explored the impact of environmental conditions on dielectric properties. Remarkably, the ceramics exhibited minimal capacitance variations of less than 10% within the relative humidity range of 30%–95% and temperatures from 15 to 85°C, indicating excellent dielectric stability.

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Excellent temperature–humidity stability in (Tb1/2Ta1/2) Ti1-O2 ceramics with colossal permittivity and low–loss tangent

Cited by 3 publications

References 62 publications

Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Enhanced humidity sensing properties of Ta2O5 and ITO doped rutile-TiO2 porous ceramics

Stability of giant dielectric properties in co‐doped rutile TiO₂ ceramics under temperature and humidity

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Excellent temperature–humidity stability in (Tb1/2Ta1/2) Ti1-O2 ceramics with colossal permittivity and low–loss tangent

Cited by 3 publications

References 62 publications

Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics

Enhanced humidity sensing properties of Ta2O5 and ITO doped rutile-TiO2 porous ceramics

Stability of giant dielectric properties in co‐doped rutile TiO2 ceramics under temperature and humidity

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Product

Resources

About

Stability of giant dielectric properties in co‐doped rutile TiO₂ ceramics under temperature and humidity