EPL
·
2016
·Vol. 114
·期 5
·56003
·
IF 1.963
Lidong Dai,Lei Wu,Heping Li,Haiying Hu,Yukai Zhuang,Kaixiang Liu
In this study, the effect of pressure on undoped and 5% yttrium-doped SrZrO3 (SZY0 and SZY5) were conducted from the ambient condition to {\sim}25\ \text{GPa} with a diamond anvil cell. The comparison of the high-pressure Raman spectra of SZY0 and SZY5 indicate that SZY0 displays a rigid structure without any structural modification, whereas for SZY5 a structural transition at {\sim}15\ \text{GPa} is revealed. Some characteristic physical parameters such as bulk conductivities, grain boundary conductivities, Warburg diffusion coefficient, transference number and bulk relaxation frequency were determined by the high-pressure impedance spectroscopy data. An obvious discontinuous inflexion point (at {\sim}13\ \text{GPa}) for SZY5 sample is observable which was also verified the phase-transition of the Raman spectroscopy results. A mixed conduction mechanism for both SZY0 and SZY5 are coexisting for both SZY0 and SZY5 in a wide pressure range. The pressure-induced phase-transition of SZY5 would result in an inversion of conduction mechanism that is characterized by the dominant charge carriers transformation from electron to ion. The Maxwell-Wagner relaxation arising at the interfaces of grain and grain boundary indicates that Y-doping and pressure could make the ions diffusion much easier through the boundaries and finally enhance the dielectric performance of the sample. It is suggested that pressure could be a useful tool to manipulate the microstructure and dielectric performance of polycrystal through altering the grain boundary distribution.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2025
·
IF 6.4
Yapeng Dong,Yuning Liang,Bo Gao,Qun Xu
Exploring advanced technology to obtain quantum materials presenting novel and unexpected electronic states upon proper manipulation is an important research endeavor. Usually, plastic deformation can lead to some amount of disruption that can result in new physical phenomena and fascinating structures. However, how to realize efficient plasticization and manipulation to obtain irreversible variation in such materials, especially those presenting quantum material behavior, is a great challenge. Herein, we show that upon plastic deformation induced by supercritical CO2 (SC CO2) on SrZrO3, typically at a pressure of 16 MPa, SrZrO3 experiences a transition from a bulk material to a two-dimensional (2D) structure. More importantly, it can be observed that the octahedral rotation of ZrO6 is suppressed. Furthermore, plastic deformation frequently induces magnetism in SrZrO3. Via polarization characterization, SrZrO3 displays multiferroic characteristics, exhibiting a considerable enhancement in the saturation magnetisation strength and polarization strength. At room temperature, SrZrO3 exhibits a saturated magnetisation of 0.1280 emu g−1, accompanied by a polarization of 0.27 μC cm−2. Therefore, this work demonstrates that plastically deformed SrTiO3 induced by SC CO2 can successfully transition into a quantum multiferroic material. These results establish a new method toward plastic deformation for the manipulation of the electronic properties of quantum materials.
研究领域:
材料科学
·
凝聚态物理
·
量子物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Ran Wang,Yawei Wang,Shufang Chang,Shu Jin,Yinlin Shao,Xiaoxiang Xu
Complete solid solutions between LaTaON 2 and SrZrO 3 , i.e. (LaTaON 2 ) 1−x (SrZrO 3 ) x (0 ≤ x ≤ 1) have been built which are very useful in tailoring many important parameters of LaTaON 2 . Band gap of LaTaON 2 becomes tunable by controlling the level of solid solutions with SrZrO 3 . Structural distortions, defects (e.g. Ta 4+ species) concentration and surface hydrophilicity of LaTaON 2 are largely improved by introducing SrZrO 3 in the structure. These modifications contribute to much enhanced photocatalytic activities of solid solutions for oxygen production which clearly outperform pristine LaTaON 2 under visible light illumination. Apparent quantum efficiency as high as 0.87% at 420 ± 20 nm was achieved at (LaTaON 2 ) 0.6 (SrZrO 3 ) 0.4 (x = 0.4). Further analysis suggest that introducing SrZrO 3 results in realignment of band edge positions of LaTaON 2 so as to be more appropriate for water splitting reactions.
研究领域:
材料科学
·
光催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·9032-9043
·
IF 2.478
Liu Yunyi,Pan Yongqi,Bai Xudong,Wang Jinchuan,He Caiwang,Xu Zunping,Chen Yi
A conventional ceramic preparation method was used to fabricate the newly designed ternary (K,Na)NbO 3 -based lead-free ceramics, which have the general formula of (0.97- x )K 0.40 Na 0.60 Nb 0.95 Sb 0.05 O 3 –0.03Bi 0.5 K 0.5 HfO 3 – x SrZrO 3 . An X-ray diffraction analysis, together with dielectric-temperature measurements, was performed for determining their phase structures. The crystal structure was found to transition from a rhombohedral-orthogonal phase coexistence to a three-phase coexistence of rhombohedral-orthogonal-tetragonal phases with the increase in SrZrO 3 concentration, and then to a rhombohedral-tetragonal phase coexistence, and finally to a single rhombohedral phase. Near the three-phase coexistence zone, the ceramics exhibit an obviously enhanced electrical activity, with an electromechanical coupling coefficient k p = 0.364 and a piezoelectric constant d 33 = 280 pC/N. Through a microstructure analysis, a slightly excessive amount of SrZrO 3 was found to result in an inhibition for the grain growth of the studied ceramics. These results show that incorporating SrZrO 3 into ternary (K,Na)NbO 3 -based ceramics is still an effective means of constructing phase boundaries and improving the electromechanical properties.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Yuanming Gao,Yu Bai,Peng Zhang,Weicheng Liang,Qi Liu,Shufang Yan,Jiao Huang,Hongying Dong,Ruigang Wang,Wen Ma
A double rare-earth (Yb/Y) co-doped SrZrO 3 [Sr 1.0 (Zr 0.9 Yb 0.05 Y 0.05 )O 2.95 ] thermal barrier coating was prepared via suspension plasma spraying (SPS). The rare-earth nitrates [Zr(NO 3 ) 4 ·5H 2 O, Sr(NO 3 ) 2 , Yb(NO 3 ) 3 ·6H 2 O, Y(NO 3 ) 3 ·6H 2 O] and NH 4 (C 2 O 4 ) 2 ·H 2 O were used to prepare the precursor suspension by co-precipitation. The thermal decomposition and crystallization of the precursor suspension powders calcined at 1200 °C were characterized with X-ray diffraction and a synchronous thermal analyzer coupled with quadrupole mass spectrometry . Zr 2 (C 2 O 4 ) 2 (OH) 4 decomposed into Zr(C 2 O 4 ) 2 , ZrO 2, and H 2 O initially, followed by the decomposition of Zr(CO 3 ) 2 into ZrO 2 . The SrC 2 O 4 precursor decomposed into SrCO 3 and SrO consecutively. The ZrO 2 reacted with SrO (Yb 2 O 3 , Y 2 O 3 ) to generate the Yb/Y co-doped SrZrO 3 . And the Yb/Y co-doped SrZrO 3 coating with a columnar crystal structure was prepared by SPS, which was analyzed with scanning electron microscopy, an inductively coupled plasma atomic emission spectrometer, and a laser flash analyzer. The thermal conductivity of the as-prepared coating was 1.77 W·m −1 ·K −1 at 1000 °C, which was more than 19% lower than that of the SPS SrZrO 3 coating.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 14
·e202300661
·
IF 8.4
Lulu Jiang,Truls Norby,Donglin Han
Graphical At the boundary : SrZr 0.9 Y 0.1 O 3− δ has high proton transport number in wet oxygen, moderate proton conductivity and high chemical stability. Its grain boundary has lower proton transport number than that of bulk, possibly due to decreased proton mobility and tunnelling of electron holes across the grain boundary. Proton conducting acceptor-doped SrZrO 3 has a history as long as that of BaZrO 3 , but has attracted less interest. Inspired by its higher transport number of ionic conduction in wet oxygen revealed by our recent work, we here explore further aspects of doped SrZrO 3 as electrolyte in proton ceramic electrochemical cells. In-situ high temperature XRD (HT-XRD) analysis of SrZr 0.9 Y 0.1 O 3− δ (SZY10) indicated an anisotropic chemical expansion of hydration, stronger along the b than the a direction, and negative in the c direction. A systematic electromotive force (EMF) and impedance spectroscopy study as a function of and allowed determination of partial conductivities of electron holes and ions (mainly protons) in bulk (grain interior) and grain boundaries. Enthalpies and preexponentials were determined and interpreted for bulk and grain boundary partial conductivities based on defect chemistry and a brick layer model. The hole conductivity in bulk is modest and ensures high ionic transport numbers in oxidizing atmospheres, while grain boundaries exhibit lower ionic transport numbers from a relatively higher hole conductivity attributed primarily to tunnelling past the deepest part of the space charge region. Y-doped SrZrO 3 (SZY) materials exhibit lower proton conductivities but excel over Y-doped BaZrO 3 (BZY) in terms of thermal expansion compatibility with electrode materials and higher ionic transport numbers in oxidizing atmospheres and may hence be candidates for functional layers between BZY-based electrolytes and positrodes in proton ceramic electrochemical cells.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Enbo Li,Yu Bai,Hongying Dong,Ruiling Jia,Xueping Zhao,Ruijun Wang,Manyu Bao,Wen Ma
The Al-doped SrZrO 3 perovskite powder with low infrared emissivity at high temperatures was prepared. The infrared radiation performance and thermophysical properties of the perovskites at high temperatures were discussed. As a result, the infrared emissivity of the Al-doped SrZrO 3 perovskite powder is associated with Al 3+ -doping content, phase composition and particle morphology . The flaky particles SrZr 0.85 Al 0.15 O 2.925 formed by heat treatment at 1000 °C for 6 h have the lowest infrared emissivity of 0.245 in 3–5 μm wavebands at 590 °C. The perovskite powder's infrared emissivity is positively correlated with its electrical resistivity and has no apparent change after heating over 800 °C for long-term. The SrZr 0.85 Al 0.15 O 2.925 perovskite ceramic formed by pressureless sintering still maintains ideal heat insulation performance with the thermal conductivity from 1.17 to 2.21 W m −1 K −1 below 1400 °C. The Al-doped SrZrO 3 perovskite tablet exhibits significant weak radiation intensity due to its characteristics of both low infrared emissivity and thermal conductivity at high temperatures.
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2021
·
IF 8.203
Enbo Li,Wen Ma,Peng Zhang,Chennan Zhang,Yu Bai,Hongxia Liu,Shufang Yan,Hongying Dong,Xiangfeng Meng
A series of Al 3+ -doped SrZrO 3 perovskite powders with low infrared emissivity were prepared. The doping-effect of Al 3+ on infrared radiation ability and thermophysical properties was investigated in detail by theoretical and experimental methods. As a result, Al 3+ -doped SrZrO 3 perovskite's infrared emissivity is related to its electronic structure and particle morphology . It can be adjusted by the Al 3+ -doped concentration. The SrZr 0.86 Al 0.14 O 2.935 powder with stronger electronic conductivity and flake particles has the lowest infrared emissivity with 0.256 in 3-5 μm waveband at 590 °C and 0.383 in 8-14 μm waveband at 550 °C. Al 3+ -doped SrZrO 3 perovskites still maintain ideal thermal stability and low thermal conductivity above 800 °C. Base on both low infrared emissivity and thermal conductivity, Al 3+ -doped SrZrO 3 tablets exhibited weaker thermal radiation intensity in the high-temperature condition and might be the potential low thermal infrared materials servicing under extreme temperature in the future.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Yuanming Gao,Yu Bai,Peng Zhang,Li Sun,Caiwen Liu,Hongying Dong,Qing Geng,Wei Wang,Wen Ma
In this study, the Yb–Y co-doped SrZrO 3 (SZ) coatings [SZYY-1 (Sr 1.0 (Zr 0.9 Yb 0.05 Y 0.05 )O 2.95 ), SZYY-2 (Sr 0.9 (Zr 0.9 Yb 0.05 Y 0.05 )O 2.85 ), and SZYY-3 (Sr 0.8 (Zr 0.9 Yb 0.05 Y 0.05 )O 2.75 )] were deposited by SPS (Suspension plasma spray) using the corresponding co-precipitation prepared precursors suspension. In the three as-sprayed SZYY coatings, there were some typical suspension plasma-sprayed coating structures, such as columnar crystals, vertical cracks, and micro/nanopores. The TCs (Thermal conductivities) of the three as-sprayed SZYY coatings were 1.23–1.88, 0.80–1.41, and 0.88–1.43 W/(m · K) at 100–1400 °C, respectively, which were at least 19% lower than that of the SZ coating (1.25 W/(m · K), 1000 °C). The TECs (Thermal expansion coefficients) of the three as-sprayed SZYY coatings were (7.8–8.7) × 10 −6 , (8.0–9.8) × 10 −6 , and (8.1–9.8) × 10 −6 /K, respectively (200–1360 °C). The sintering coefficients of the three as-sprayed SZYY coatings were 5.69 × 10 −6 , 4.29 × 10 −6 , and 3.84 × 10 −6 /s, respectively. The SZYY-3 coating showed the best SR (Sintering resistance), followed by the SZYY-2 coating and SZYY-1 coating. The SPS SZYY-2 coating with good phase stability, low TC (Thermal conductivity) and good SR is a promising new TBCs (Thermal barrier coatings) material. It is expected to be an alternative TBCs material for the next generation of high performance gas turbines .
研究领域:
材料科学
·
热物理
·
涂层技术
·
能源工程
✓ 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
·
2021
·Vol. 48
·期 2
·1836-1843
·
IF 4.527
Ruiting Zhang,Yahong Jin,Lifang Yuan,Chuanlong Wang,Guangting Xiong,Haoyi Wu,Li Chen,Yihua Hu
At present, for inorganic photochromic materials, the single function limits their application level in the field of optical storage and anti-counterfeiting. Generally, the reversible modulation of photoluminescence is achieved through a photochromic process, thereby improving the ability of the photochromic material to store information. Here, we designed a Sm 3+ doped perovskite oxide (SrZrO 3 :Sm 3+ ) inorganic photochromic material. Combined with its red photoluminescence and photochromic properties, it can realize dual information storage and recognition functions. The fluorescence regulation function is realized by the doping of Sm 3+ , which is conducive to the application in the direction of optical switch. The mechanism of photoluminescence and photochromism was studied. Finally, a flexible film with SrZrO 3 :Sm 3+ material was fabricated to demonstrate rewritable optical recording and storage and reading of dual optical information.
研究领域:
材料科学
·
光学存储
·
光致发光
·
智能材料
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Haobo Wang,Jing Cao,Hetong Wu,Weifeng Yao,Hexing Li
Piezocatalysis offers a sustainable route for converting mechanical energy into chemical fuels, yet its development is hindered by the limited availability of efficient non-centrosymmetric piezoelectric materials. Herein, centrosymmetric SrZrO 3 (SZO), a classic high-k dielectric, is further activated for enhanced piezocatalytic H 2 evolution through hydrothermal synthesis followed by mild acid etching. Pristine SZO already exhibits measurable H 2 evolution under ultrasonic excitation despite a negligible/very weak SHG response, suggesting that localized defect-associated polarization may contribute to a baseline piezocatalytic activity. After mild acid etching, the treated sample (SZO_aw) shows markedly enhanced piezocatalytic H 2 evolution together with a more evident symmetry-breaking response, enhanced local electromechanical behavior, modified surface-potential characteristics, and near-surface structural distortion. Comparative characterization further indicates that the dominant bulk perovskite framework is preserved after treatment, while the enhancement cannot be explained solely by increased surface area or by a simple bulk-averaged defect increase. Under identical ultrasonic conditions, SZO_aw delivers an H 2 evolution rate of 12.02 mmol·g −1 ·h −1 , which is about 10 times that of commercial SrZrO 3 and 3.4 times that of pristine SZO. These results support that mild-acid-induced near-surface polar/structural modification is an important contributing factor to the enhanced piezocatalytic performance of centrosymmetric SrZrO 3 , providing a viable strategy for enhancing piezocatalytic activity in centrosymmetric dielectrics.
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DOI
高影响因子
危险品化学品经营许可证（带存储）