JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chenwei Xiong,Rui Hao,Kewen Tao,Huashan Li,Shaopeng Lin,Decai Ma
This study has demonstrated that lithium niobate doped with praseodymium (LiNbO 3 :Pr), which initially did not exhibit persistent luminescence(PersL), can display significant PersL performance through the modulation of the lithium-to-niobium ratio (R LN ). By adjusting the R LN to 1, LiNbO 3 :Pr achieved enhanced PersL, lasting several minutes, with the afterglow's duration further influenced by the R LN . Thermoluminescence (TL) assays and energy diagram analyses have elucidated that the presence and depth of oxygen vacancy defects are critical for both the emergence and longevity of PersL LiNbO 3 :Pr polycrystals . These insights enhance the understanding of PersL mechanisms in lithium niobate crystals and highlight their potential for application in optical information storage.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 21
·18036-18044
·
IF 2.324
Hu Querui,Wang Yiping,Wu Lei,Yin Jiang,Chen Lang,Yuan Guoliang,Yang Ying
Piezoelectric ceramics x LiNbO 3 – y BiScO 3 –(1− x − y )PbTiO 3 (LN–BS–PT, 0.00 ≤ x ≤ 0.10, 0.30 ≤ y ≤ 0.36) were synthesized and their phase diagram and morphotropic phase boundary between rhombohedral and tetragonal phases have been confirmed. The optimal properties were found at the composition of 0.03LN–0.36BS–0.61PT with piezoelectric coefficient d 33 * value of 702 pm/V, d 33 of 551 pC/N, planar electromechanical coupling factor k p of 0.51, remnant polarization P r of 46.5 µC/cm 2 , Curie temperature T c of 337 °C, and a large strain of 0.351% at an electric field of 50 kV/cm and frequency of 2 Hz with a low strain hysteresis of 5.9%. The Curie temperature of the ternary system presents a linear relationship with LiNbO 3 and BiScO 3 contents. The optimization of these electric properties was probably ascribed to the enhancement in domain walls and the improving mobility of domain switching due to LiNbO 3 doping.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Hankun Xu,Kun Lin,Wenjie Li,Qiang Li,Joerg C. Neuefeind,Jue Liu,Kenichi Kato,Jun Miao,Xianran Xing
As a typical and commercial nonlinear optical (NLO) material, LiNbO3 usually suffers from non-stoichiometric compositions, but the role of non-stoichiometry in second harmonic generation (SHG) remains unclear. In this study, we prepared non-stoichiometric LiNbO3 with a Li mole percentage amount covering critical ranges from 47 to 50. We found that a 47 mol % Li amount can remarkably weaken the SHG response by 50% without an obvious change of the band gap. A detailed structural analysis indicates that reducing the Li content brings anti-occupied Nb (NbLi4·) together with Li vacancies (VLi′), which decreases local distortions and local polarizations of both NbO6 and LiO6 octahedra and ultimately lead to the decline of the SHG response. Such effects are discussed in terms of the looser and less anisotropic structure character of LiNbO3. The above results are supported by joint synchrotron X-ray/neutron diffraction, atomic pair distribution function (PDF) analysis, and theoretical calculations. These insights are helpful to the future design of functional materials in non-stoichiometric compositions.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Querui Hu,Yiping Wang,Kang Yan,Lang Chen,Guoliang Yuan,Jing Chen,Ying Yang
The structure and electric properties of 5 mol. % LiNbO 3 doped x BiScO 3 –(95- x )PbTiO 3 (5LN– x BS–(95- x )PT, 26 ≤ x ≤ 41 mol. %) ceramics have been systematically investigated. The composition-, temperature- and electric-field-dependent phase transitions were established carefully by the temperature-dependent dielectric measurements. The results verified that the 5LN– x BS–(95- x )PT system transformed to nonergodic relaxors (NR) phase gradually from normal ferroelectrics (FE) phase with the addition of BiScO 3 contents. With the increase of temperature, ergodic relaxors (ER) phase was observed before the phase transition from FE and/or NR to paraelectrics (PE) phase. By comparing the dielectric responses of the ceramics before and after polarization, it was confirmed that the electric field could induce a phase transition from NR to FE while the ceramics were polarized, which was attributed to the growth of the dipole clusters and the permutation of the macroscopical ferroelectric order under the external electric field. The phase diagram of 5LN– x BS–(95- x )PT system was then built and the morphotropic phase boundary (MPB) between tetragonal and rhombohedral phase of the system was identified at 34 ≤ x ≤ 36. The optimal properties were found at the composition of 5LN–34BS–61PT ceramic with piezoelectric coefficient d 33 value of 514 pC/N, planar electromechanical coupling factor k p of 0.47, relative dielectric constant ε r of 2511, and remnant polarization P r of 37.4 μC/cm 2 . The displayed piezoelectric properties could provide alternative compositions with less lead contents comparing with the Pb(Zr, Ti)O 3 based piezoceramics.
研究领域:
材料科学
·
陶瓷材料
·
电介质物理
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Dongyang Jiang,Weida Chen,Yuxian Duan,Zhi Li,Zechen Xiao,Yuhan Jing,Qianxu Ye,Liexing Zhou,Mingjun Wang,Jinming Cai
The traditional method for producing lithium niobate (LiNbO 3 ) powder is based primarily on a solid-state reaction, which has a high energy consumption and low efficiency, requiring long periods of insulation at a high temperature of 1000–1300 °C. In this work, high-purity and high-crystallinity LiNbO 3 powder was prepared by using niobium pentoxide (Nb 2 O 5 ) and lithium fluoride (LiF) at 800 °C for 0.5 h. Interestingly, the prepared LiNbO 3 powder demonstrated exceptional piezoelectric catalytic degradation performance and reusability. Under the influence of ultrasonic waves , the LiNbO 3 powder achieved complete degradation of Rhodamine B (RhB) within a remarkably short duration of 20 min, with a reaction rate constant of 0.2702 min −1 , which was 7.9 times larger than that of commercial LiNbO 3 (0.03416 min −1 ). Furthermore, even after undergoing six degradation cycles, the powder maintained its high degradation efficiency. Active substance trapping and detection experiments revealed the presence of hydroxyl radicals (•OH) and superoxide radicals (•O 2 − ) with potent oxidizing capabilities during the piezoelectric catalysis process, affirming their pivotal roles in the degradation of RhB. The energy-saving and efficient method employed in acquiring LiNbO 3 would provide an exciting pathway towards the development of efficient catalysts for organic wastewater treatment, fueled by clean energy sources.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jianwei Lian,Jiajia Tao,Xiaojie Chai,Yan Zhang,Anquan Jiang
Effects of atmosphere, temperatures and duration time on the surface topography and the electrical conductivity of LiNbO 3 single crystals deposited with a 300-nm-thick layer of different metal films (Al, Mg and Zn) had been systematically investigated. LiNbO 3 samples covered with Al film annealed at 500 °C for 6 h in different atmosphere were firstly studied. There were a lot of small holes generated after the residual film cleaning. In addition, the surface roughness was enhanced with increasing pressure. Compared with areas that without metal Al coated, a sharp step was formed, especially the deep step of about 125 nm in 3%H 2 +Ar atmosphere. The I V curves reveal that the electrical conductivity of sample surface annealed at normal pressure was better than that in low vacuum. The current value was up to about 20 mA at 10 V in 3%H 2 +Ar, resulting in the conductivity significantly improved. Subsequently, samples deposited with different metal (Zn, Mg and Al, respectively) films annealed at 400 °C for 6 h in 3%H 2 +Ar were discussed. After wet etching, interestingly, a large number of nano-sized protrusions were formed on the surface. Both of samples coated with Mg and Zn films presented no obvious step depth, while a clear step about 13 nm was formed for Al-coated samples. The I V curves show that the surface conductivity of Zn-coated samples achieved the maximum of about 2.5 mA at 5 V among the three metals. Furthermore, Zn-coated samples annealed at different temperatures and holding time in 3%H 2 +Ar were also analyzed. After pickling, also, there were a lot of nanobulges appeared across the surface. With the temperatures keeping growth and the time extending, the nanobulges became much more compact and well-distributed. At the same time, the surface conductivity of samples would be gradually and effectively enhanced. The PL and XPS spectrums have indicated that more oxygen vacancies formed with increasing temperatures and holding time, resulting in the significant improvement in surface conductivity. The conduction mechanisms of sample surface can behave differently owing to the various annealing conditions.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Zhai Haifa,Qi Jingjing,Zhang Xiang,Li Hongjing,Yang Liping,Hu Chunjie,Liu Hairui,Yang Jien
Hollow structure LiNb 3 O 8 photocatalysts were prepared by a hydrothermal method assisting sintering process. The particles’ aggregation to form hollow structures with obvious cavities can be attributed to the Li element volatilization during calcination process. All the LiNb 3 O 8 powders show high photocatalytic efficiency of degradation of methylene blue (MB), especially for the sample calcined at 700 °C (LNO700), with only 3 h to completely decompose MB. The photo-degradation of MB follows the pseudo-first-order kinetics, and the obtained first-order rate is 0.97/h. The larger degradation rate of LNO700 can be attributed to its hollow structure which provides a larger specific surface area and more active sites to degrade the MB molecules. The cycling test of photo-degradation and adsorption of MB over LNO700 powder indicates that the hollow structure of the LiNb 3 O 8 photocatalyst is stable and the LiNb 3 O 8 photocatalyst is an efficient photocatalyst with good reusability, confirmed by the XRD and X-ray photoelectron spectroscopy tests before and after photo-degradation of MB.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 13
·2302662
·
IF 8
Quanhua Lin,Xianqiu Lin,Xu Feng,Wangming Yang,Jiajia Tan,Wenjie Qiu,Shunchun Yao,Zhifeng Chen,Jianrong Qiu,Shifeng Zhou
The rational control of intrinsic defects in materials can significantly enhance their scientific and technological potentials, but it remains a long-standing challenge in nanocrystal-in-glass composites (NGCs). Herein, a defect engineering strategy mediated by the mixed alkali effect is proposed and experimentally demonstrated for NGCs. Interestingly, the hybridization of large alkali ions can effectively increase the barrier of Li + migration and reduce the Li-related defects in LiNbO 3 NGC. As a result, a novel LiNbO 3 NGC with greatly reduced Li-related defects, high crystallinity of over 60%, and excellent optical transmission are successfully fabricated. This unique NGC configuration facilitates efficient transverse second harmonic generation (TSHG) in a broad wavelength region. Based on the above effects, a standard TSHG device is fabricated and implemented to monitor ultrashort optical pulses with duration in the order of ≈10 −13 s over a broad wavelength region, down to 780 nm. The proposed strategy not only provides a new idea for defect engineering in materials science but also has great significance for boosting the practical applications of NGCs in ultrashort optical pulse monitoring.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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