JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3944-3950
·
IF 2.22
Tian Xiuna,Dou Hongjian,Wu Lingyuan
Based on the luminescence of Bi 3+ , novel temperature sensing materials CaZrO 3 :Bi 3+ and CaZrO 3 :Bi 3+ /Sm 3+ were successfully synthesized by solid-state reaction. The XRD patterns show that the synthesized materials have a pure phase of CaZrO 3 . The XPS results show that the Bi 3+ and Sm 3+ can be detected in CaZrO 3 :Bi 3+ /Sm 3+ . With the excitation of 318 nm, the CaZrO 3 :Bi 3+ material shows intense temperature-dependent luminescence. The maximum relative sensitivity can be obtained at 440 K (1.78% K −1 ). Under the excitation of 408 nm, the CaZrO 3 :Sm 3+ material shows the characteristic emission peaks of Sm 3+ . The spectral overlap between the emission spectrum of Bi 3+ and the excitation spectrum of Sm 3+ leads to an energy transfer from Bi 3+ to Sm 3+ in CaZrO 3 :Bi 3+ /Sm 3+ phosphor. With the excitation of 318 nm, the emission spectrum of CaZrO 3 :Bi 3+ /Sm 3+ material shows the characteristic peaks of Bi 3+ and Sm 3+ . The fluorescence decay curves also show the evidence of the energy transfer from Bi 3+ to Sm 3+ . The luminescence intensity ratio of Sm 3+ and Bi 3+ in CaZrO 3 :Bi 3+ /Sm 3+ shows obvious temperature dependence. Based on the luminescence intensity ratio, a large relative sensitivity is obtained at 443 K (1.15% K −1 ).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 7
·3361-3366
·
IF 1.491
Cao Renping,Han Peng,Luo Wenjie,Fu Ting,Luo
Zhiyang,Liu Pan,Chen Zhiquan,Yu Xiaoguang
Novel CaZrO 3 :Sm 3+ , Bi 3+ phosphor is synthesized by a solid-state reaction method in air and the crystal structures and luminescence properties are investigated. The emission spectrum with excitation 308 nm contains emission of Sm 3+ and Bi 3+ ions at the same time; however, it only has an emission of Sm 3+ ion with excitation 408 nm. Emission intensity of CaZrO 3 :Sm 3+ phosphor can be enhanced about four times owing to energy transfer from the Bi 3+ ion to the Sm 3+ ion and with the fluxing agent role of Bi 3+ ion when Bi 3+ ion is co-doped. The possible luminous mechanism is analyzed by energy level diagrams of Bi 3+ and Sm 3+ ions and the energy transfer process in CaZrO 3 :Sm 3+ , Bi 3+ phosphor. The experimental results indicate that, hopefully, CaZrO 3 :Sm 3+ , Bi 3+ phosphor can be used as a reddish orange phosphor candidate for white light-emitting diodes based on near an ultraviolet (~408 nm) chip.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2025
·
IF 2.2
Chong gui Lei,Fei ruan,Xi Wu,Jinxiao Bao,Yonghe Zhang,Yuwei Ma,Junting Yang,Guoqi Liu
To understand the microstructure and electrochemical performance of Tm-doped CaZrO3-based proton conductor in more detail, CaZr1−xTmxO3−δ (x=0, 0.025, 0.05, 0.075 and 0.1) proton-conducting electrolyte samples were prepared by solid state reaction method at 1523 and 1873 K for 8 hours. The crystal structure of the proton-conducting solid electrolyte was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy. An electrochemical workstation was used to measure the electrical conductivity, the H/D isotope effect, and the chemical diffusion coefficient of hydrogen for the CaZr1−xTmxO3−δ electrolyte. According to the results, the total conductivity of electrolyte CaZr1-xTmxO3-δ falls in 4.83×10-6 ~ 7.22×10-4 S/cm and the conductivity activation energy is 0.78 to 1.37 eV in oxygen and hydrogen atmosphere at 973 to 1173℃. The chemical diffusion coefficient of proton in CaZr1-xTmxO3-δ proton conductor is between 5.9×10-7 and 4.5×10-6 cm2/s in the temperature range of 973 to 1373 K and the diffusion activation energy is 55486 kJ/mol. The interstitial proton concentration falls in 7.97×10-4~1.21×10-3 at 973 to 1073 K under hydrogen rich atmosphere. When the doping concentration (mol/mol) of Tm is 0.05, the electrolyte specimen has excellent electrochemical performance, the concentration of non-associated state Tm is approximately 2% of the total doping amount.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2020
·Vol. 51
·期 10
·5328-5338
·
IF 2.05
Zou Yongshun,Gu Huazhi,Huang Ao,Fu Lvping
Sintered magnesia refractories combined by in situ intergranular CaZrO 3 phases were synthesized using natural MgO-containing natural minerals with CaO and SiO 2 impurities and nano-sized ZrO 2 additive. A homogenous distribution of intergranular CaZrO 3 , independent from the intergranular CaO-MgO-SiO 2 phases, was formed in situ within the sintered magnesia aggregates by introducing 0.75 wt pct nano-sized ZrO 2 into the magnesite. The formation mechanism of the in situ intergranular CaZrO 3 phases was determined. The nano-sized ZrO 2 was introduced and uniformly distributed at grain boundaries of the magnesia due to the micron-nano-sized particles composite system and wetting grinding process. Then the CaO in impurities were prior to SiO 2 to react with the ZrO 2 for generating CaZrO 3 at the grain boundaries by increasing sintering temperature. Nevertheless, the nano-sized ZrO 2 particles were encapsulated in the MgO crystallites with similar particle size decomposed from brucite and prevented from reacting with CaO impurities in magnesite. The mixing homogeneity of magnesite particles and ZrO 2 particles and the direct contact between ZrO 2 and CaO impurities in magnesite has a crucial effect on the formation of intergranular CaZrO 3 phases. Furthermore, the intergranular CaZrO 3 phases could enhance the bonding of magnesia grains and have great potential for improving the service performance of magnesia.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 3
·2327-2333
·
IF 2.324
Cao Renping,Xiao Hui,Zhang Falin,Cheng Xinyu,Su Lei,Xiao Fen,Luo Zhiyang,Chen Ting
A series of CaZrO 3 :Bi 3+ , CaZrO 3 :Eu 3+ , CaZrO 3 :Eu 3+ , Bi 3+ , and CaZrO 3 :Eu 3+ , Bi 3+ , Li + phosphors are synthesized by high-temperature solid-state reaction method in air. Their luminescence properties are researched, compared, and analyzed. CaZrO 3 :Bi 3+ phosphor under excitation at 310 nm emits deep-blue light with chromaticity coordinate (0.1612, 0.0254). CaZrO 3 :Eu 3+ phosphor under excitation at 310 and 395 nm shows red-emitting with chromaticity coordinate (0.6386, 0.3611). CaZrO 3 :Eu 3+ , Bi 3+ phosphor under excitation at 310 nm exhibits a systematically varied hue from deep-blue to red light by changing Eu 3+ ion concentration, and that with excitation at 395 nm only emits red light with chromaticity coordinate (0.6386, 0.3611). The energy transfer process from Bi 3+ to Eu 3+ ions may be indicated by their spectral properties. The optimal Eu 3+ and Bi 3+ ions concentrations are 5 mol% and 0.9 mol%, respectively. The emission intensity CaZrO 3 :Eu 3+ , Bi 3+ phosphor may be enhanced about 1.6 times due to the co-doping Li + ion as charge compensator role. The luminous mechanism of CaZrO 3 :Eu 3+ , Bi 3+ phosphor is explained by the simplified energy level diagrams of Bi 3+ and Eu 3+ ions.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-12
·
IF 2.8
Zhu Haipeng,Wu Jinyuan,Hussain Fayaz,Ni Tao,Li Jiajing,Wang Yan,Xi Hao,Mao Minmin,Hu Ji,Liu Bing,Song Kaixin
Bi 0.5 Na 0.5 TiO 3 (BNT)-based ceramics with excellent electrostrain properties are considered to be one of the most promising lead-free alternative systems. In this work, appropriately deviating from the morphotropic phase boundary (MPB) range, the ceramics of (1− x )(0.75Bi 0.5 Na 0.5 TiO 3 -0.25Bi 0.5 K 0.5 TiO 3 )- x CaZrO 3 (abbreviated as 0.75BNT-0.25BKT- x CZ, x = 0, 0.01, 0.03, 0.05) were synthesized by the solid-state reaction method. The phase structure combined with the dielectric, ferroelectric, and field-induced strain properties was systematically analyzed. The X-ray diffraction patterns showed that CZ was well incorporated into the 0.75BNT-0.25BKT structure to form a single-solid solution. As CZ content increases, the phase structure constructed by the coexistence of rhombohedral and tetragonal phases gradually transforms into the pseudocubic phase. Meanwhile, the dielectric temperature spectra demonstrated the coexistence of ferroelectric and relaxor phases during the phase transition with the formation of the weakly coupled relaxor, implying the presence of nanodomains which were further confirmed by the high-resolution transmission electron microscopy image. Interestingly, the maximum unipolar strain of 0.34% with a prominent increase of 70% and the hysteresis of 33% with a moderate increase of 26% were obtained simultaneously at x = 0.03 as compared to those at x = 0 (0.75BNT-0.25BKT). Further to this, this study investigated the origin of the large strain together with hysteresis variation and considered that reversible phase transition combined with relaxation behavior helps realize a tradeoff between large strain and low hysteresis, which provides an effective path for the further development of high-performance lead-free piezoelectric ceramics.
研究领域:
材料科学
·
陶瓷
·
压电材料
·
功能材料
·
固态化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Adnan Khan,Xu Sang,Jiaxin Yang,Muhammad Ikram,Li Yang,Sadia Rehman,Rui Xu,Feng Song,Ming Feng
This study presents the synthesis and characterization of upconverter nanostructures consisting of a perovskite host matrix, CaZrO 3 , co-doped with trivalent ytterbium (Yb 3+ ) and europium (Eu 3+ ), denoted as CaZrO 3 :Yb 3+ /Eu 3+ . Single-doped CaZrO 3 :Eu 3+ samples were excited using a 394 nm UV source, while CaZrO 3 :Yb 3+ /Eu 3+ samples were excited with a 980 nm diode laser source. Yb 3+ ions efficiently absorb the 980 nm light and transfer the absorbed energy to the nearby ion Eu 3+ ions, leading to the emission of visible light around 590, 614, and 655 nm, respectively. The emission spectra of Eu 3+ ions exhibit an initial increase with increasing Yb 3+ concentration, peaking at 7 mol%, followed by a decrease due to luminescence quenching. The decay lifetime of Eu 3+ ions under 300 nm excitation decreases simultaneously with increasing Yb 3+ concentration, indicating energy migration between Yb 3+ and Eu 3+ . Detailed explanations of the energy transfer mechanism between Yb 3+ and Eu 3+ ions are provided, supported by equations and diagrams. This study provides valuable insights into the optimization of dopant concentrations for enhancing upconversion luminescence in CaZrO 3 :Yb 3+ /Eu 3+ nanostructures, with 3 mol% Eu 3+ concentration identified as optimal based on preliminary experiments. The findings presented in this paper contribute to the understanding of energy transfer processes in luminescence upconversion materials and highlight the potential of CaZrO 3 :Yb 3+ /Eu 3+ nanostructures for applications in lighting, displays, and bio-imaging. This work represents a significant advancement in the field of upconversion luminescence emission, particularly in the utilization of CaZrO 3 codoped with Yb 3+ and Eu 3+ , and lays the foundation for further research in this area.
研究领域:
材料科学
·
光学
·
纳米技术
·
发光材料
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 32
·44222-44235
·
IF 7.8
Wang Xiyao,Liang Jiaju,Ji Huiyu,Zhang Jian,Lin Lin,Liang Hengnan
Optical manometry is essential in diamond anvil cell experiments, motivating pressure-sensitive phosphors that provide robust broadband readouts over a wide pressure range. Here we report a Ce 3+ -activated CaZrO 3 perovskite phosphor with a low dopant level of about 0.40 atom % Ce quantified by EDS, and we evaluate its pressure-dependent luminescence response. Powder XRD and SEM–EDS confirm a single-phase CaZrO 3 host and successful incorporation of the Ce activator. Temperature-dependent photoluminescence and lifetime measurements reveal that the material exhibits good thermal stability. Under compression up to 45 GPa, the broadband Ce 3+ 5d–4f emission exhibits an almost linear redshift of the band centroid with dλ/d P about 2.45 nm GPa –1 and a concurrent broadening of FWHM with dFWHM/dP about 1.15 nm GPa –1 . In parallel, the CIE 1931 chromaticity coordinates derived from the full emission spectrum evolve regularly with pressure, enabling a continuous color change from blue to green and offering a convenient visual readout. High-pressure Raman spectra indicate a structural transition near 30 GPa, consistent with synchrotron XRD reports for CaZrO 3 , yet no discontinuity is observed in the pressure dependences of the luminescence parameters. First-principles calculations suggest that compression is mainly accommodated by ZrO 6 octahedral tilting and anisotropic polyhedral compression, whereas the local Ce-O crystal-field environment evolves smoothly, accounting for the continuous optical response through the transition. These results establish CaZrO 3 :Ce 3+ as a wide-range, multi-parameter optical manometer for high-pressure calibration at room temperature.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Kangkang Yuan,Chen Shu,Kexin Meng,Wenjun Zhao,Guosheng Sun,Jien Zhu,Jin Chen,Yunlong Huang,Chengshun Li,Xiaotong Jin
Calcium zirconate (CaZrO 3 )-based fibrous membrane is a promising candidate in high-temperature areas for its high melting point, good phase stability up to 1900°C, low thermal conductivity, and low cost. To further enhance the high temperature flexibility of CaZrO 3 -based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO 3 -BaZrO 3 dual-phasic structure was proposed to modify the high-temperature properties from the standpoint of phase competition. CaZrO 3 -BaZrO 3 fibrous membranes were prepared with the combination of the electrospinning method and pyrolysis process. The decomposition process, phase transformation, crystallize size, and microstructure evolution of CaZrO 3 -BaZrO 3 precursor fibrous membrane were characterized. The grain size, particle size, NIR reflectivity, high-temperature stability, fire retardancy, and high-temperature flexibility were also characterized and compared with other CaZrO 3 -based fibrous membranes. The higher thermal stability and flexibility of the CaZrO 3 -BaZrO 3 fibrous membrane at 1200°C would make it a good candidate for high-temperature insulating, high-temperature supporting, and high-temperature filtration.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 1
·118781
·
IF 6.3
Leichao Cao,Yizhou Xiao,Yutang Liu,Chunchun Li,Guangzu Zhang,Fei Li
In this study, a compositional optimization strategy was formulated within the 85BaTiO 3 -15Na 0.5 Bi 0.5 TiO 3 (85BT-15NBT) system to attain X9R-type stability while maintaining a comparatively high dielectric response. Nb/Y co-doping was introduced to adjust the phase structure and dielectric behavior of the parent 85BT-15NBT. Rietveld refinement revealed a structural evolution from a tetragonal P 4 mm symmetry to pseudocubic Pm 3 ˉ m symmetry. X9R requirement, with a room-temperature permittivity of 1496 and a dielectric loss of 1.82%, was achieved. CaZrO 3 modification increased the relative permittivity to 1679 along with a dielectric loss of 1.50% without compromising the temperature stability. High-temperature impedance and Arrhenius analyses revealed improved high-temperature insulation and CZ-induced changes in the local defect and chemical environment. These findings illustrate that compositional optimization is effective for designing lead-free X9R dielectric ceramics for high-temperature MLCC applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 39
·26555-26567
·
IF 10.7
Jie Gu,Xinwei Sun,Lulu Jiang,Zihan Zhang,Truls Norby,Donglin Han
We herein report a first experimental account of surface protonic conductivity in chemisorbed and physisorbed water layers in porous perovskite alkaline earth zirconates AZrO3, measured by impedance spectroscopy in wet atmospheres. We have studied the effects of temperature, pH2O, H/D isotope exchange, A-site cation (A = Ca, Zr, Ba), sintering temperature, and cation non-stoichiometry, and supported conclusions by thermogravimetry (TG) and X-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy. The proton conduction in the chemisorbed layer dominates above 200 °C and exhibits small pH2O-dependences and large pre-exponentials, activation energies (90 ± 10 kJ mol−1), and H/D isotope effects, all consistent with protonic conduction by dissociated protons in a well-covering layer of mainly molecularly chemisorbed water. Differences between CaZrO3, SrZrO3, and BaZrO3 supported by XPS results suggest that the higher acidity of smaller A-site cations and under-coordinated cations in the surface increase the proton conductivity. Below 200 °C, protonic conduction in the 1st solid-like physisorbed water layer exhibits positive pH2O-dependences and strongly negative activation energies hence dominated by adsorption in a far-from-complete physisorbed layer. A vanishing isotope effect suggests that migration is not by free protons in the physisorbed layer, but a vehicular species such as hydroxide ions. At the highest relative humidities near room temperature, a sharp increase in conductivity is indicative of increasing mobilities as the thicker water layer goes liquid over a hydrophilic surface. If these results are transferrable to electron conducting perovskites used as positrode materials for proton ceramic fuel cells at, e.g., 600 °C, they suggest that the strong chemisorption of water may block oxygen adsorption, while the high activation energy limits and gives a strong temperature dependency to surface diffusion of protons.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
FengLong Zhang,YanYu Wang,WenYu Zhang,Fei Ruan,JinXiao Bao
This study investigates the electrochemical properties of two perovskite-type proton conductors, CaHf 0.82 Sc 0.18 O 2.91 (CHSc) and CaZr 0.82 Sc 0.18 O 2.91 (CZSc), synthesized via a high-temperature solid-state reaction method. The materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and AC impedance spectroscopy to evaluate their phase structure, morphology, and electrical conductivity. Both compositions formed dense, single-phase orthorhombic perovskite structures. The research systematically compares their performance, focusing on proton conductivity, chemical stability, and chemical diffusion coefficients. Key analyses, including the H/D isotope effect and electromotive force (EMF) measurements, were conducted to delineate the dominant charge carriers and optimal operating temperature ranges. Results demonstrate that both materials function as proton conductors below 1173 K, with proton transport numbers exceeding 0.90. Notably, the CHSc electrolyte exhibited superior overall electrochemical performance, including higher conductivity and chemical diffusion coefficient, compared to its zirconium-based counterpart. This enhanced performance is attributed to CHSc exhibiting higher chemical diffusion coefficient, proton transport number, and water hydration ability in the range of 873-1173 K. These findings underscore the potential of Sc-doped CaHfO 3 (CHO) as a promising electrolyte for intermediate-temperature electrochemical devices like hydrogen sensors and fuel cells.
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DOI
高影响因子
危险品化学品经营许可证（带存储）