JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Kui Liu,Yuran Yang,Gongwen Gan,Gaojie Zou,Yida Lei,Cheng Liu,Zongliang Zheng
This study investigates the effects of TiO 2 doping on the temperature stability and dielectric properties of Li 2.75 MgTiO 4 F 0.75 ceramics for low-temperature co-fired ceramic (LTCC) applications. Li 2.75 MgTiO 4 F 0.75 - x TiO 2 (1 wt% ≤ x ≤ 6 wt%) ceramics were synthesized via solid-state reaction. Among the compositions studied, the sample doped with 5 wt% TiO 2 and sintered at 850 °C exhibited optimal dielectric properties, including a ε r of 16.22, a Q × f of 79,195 GHz at 10.7 GHz, and a near-zero temperature coefficient ( τ f = −7.83 ppm/°C). Analysis revealed that LiF, which did not form part of a solid solution, aided densification and improved dielectric properties. However, the high dielectric loss of TiO 2 led to a decrease in the Q × f value. Terahertz frequency measurements further confirmed the system’s potential for terahertz communication applications, with ε r ≤ 13.7 and a tan δ between 0.01 and 0.1. Additionally, the ceramics demonstrated good chemical compatibility with Ag electrodes. These results highlight the promising application of Li 2.75 MgTiO 4 F 0.75 -5 wt%TiO 2 composite ceramics in LTCC technology.
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高影响因子
CERAMICS INTERNATIONAL
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2018
·Vol. 44
·期 17
·21000-21003
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IF 3.057
Jie Zhang,Zhenxing Yue,Yu Luo,Longtu Li
A cofired trilayer ceramic architecture showing as MgTiO 3 /TiO 2 /MgTiO 3 was designed to realize temperature-stable and ultrahigh- Q microwave dielectrics in the typical MgTiO 3 -TiO 2 system. The effects of TiO 2 content on the microwave dielectric properties of cofired trilayer ceramics were studied. Through the design of cofired trilayer architecture, the chemical reactions between MgTiO 3 and TiO 2 were limited within a narrow region of MgTiO 3 /TiO 2 interfaces (~ 15 µm in width), which could be beneficial for optimizing the microwave dielectric properties. Excellent characteristics of ε r ~ 18.38, Q×f value ~ 169,900 GHz and τ f ~ − 1 ppm/°C were gained for the MgTiO 3 /TiO 2 /MgTiO 3 ceramic architectures stacked with 1.63 vol% TiO 2 . The current work could serve as new strategies to develop high-performance dielectric resonators and multilayers for 5G wireless communication applications.
研究领域:
材料科学
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无机非金属材料
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电子陶瓷
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微波介质材料
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功能陶瓷
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2014
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IF 4.258
Xiao-Shui Li,Xi Chen,Huan Sun,Bi-Feng Yuan,Yu-Qi Feng
Selective and effective enrichment of phosphopeptides from complex samples is essential in phosphoproteome study by mass spectrometry (MS). In this work, we compared perovskites (MgTiO 3 , CaTiO 3 , SrTiO 3 , BaTiO 3 and CaZrO 3 ) with metal oxides (ZrO 2 and TiO 2 ) in their capability for the selective enrichment of phosphopeptides. It was found here that perovskites exhibited higher selectivity towards phosphopeptides than commonly used ZrO 2 and TiO 2 , even though they all have high affinity to phosphopeptides. As for perovskites, CaTiO 3 exhibited better selectivity for enrichment of phosphopeptides than SrTiO 3 , MgTiO 3 , BaTiO 3 and CaZrO 3 , which might be ascribed to their crystal structures and electrophilic abilities. Moreover, to further confirm the performance of CaTiO 3 , CaTiO 3 and TiO 2 were applied to the enrichment of phosphopeptides from tryptic digest of proteins of human Jurkat-T cell lysate, respectively. The results showed CaTiO 3 has much higher selectivity than TiO 2 in the enrichment of phosphopeptides from the complex biological sample. Taken together, here we show that CaTiO 3 is an excellent material for the highly selective enrichment of phosphopeptides and it could be potentially used in the large-scale phosphoproteome study.
研究领域:
蛋白质组学
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分析化学
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生物医学
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xingang Xu,Ning Wang,Xin Li,Lu Yang,Fazhou Wang
The global temperature rising and building cooling energy consumption increasing have caused a serious concern. This study proposed a novel carbonated inorganic radiative cooling material, called as γ-dicalcium silicate carbonated radiative cooling coatings (CRCC), expected to be used for building cooling through spectral emission from buildings to space. In terms of CRCC, high reflectivity to the solar spectrum and high emissivity to the atmospheric window (8–13 μm wavelength) can be achieved by simply optimizing the preparation solid/water ratio. This is attributed to the reaction products actions between CO 2 and γ-dicalcium silicate. The predominantly consisting of CaCO 3 , the vibrational characteristics of C O and Si O bonds, and along with a surface porous structure offer the excellent and distinctive spectrum and scattering characteristics. The addition of nano Al 2 O 3 could further enhance the spectral performance of CRCC, which present an exceeding 95 % reflectivity to solar spectrum, and over 97 % emissivity to the atmospheric window, resulting in a cooling effect of ca 7 °C for the modified CRCC surface. The numerical calculation and finite element analysis further validated the superior radiative cooling performance of CRCC, demonstrating their capability to maintain lower temperatures. We believe that the CRCC not only serves as a low-carbon construction material but also facilitates radiative cooling, contributing to energy savings in buildings, and achieving low-carbon environmental protection.
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PHYSICS AND CHEMISTRY OF MINERALS
·
2025
·Vol. 52
·期 3
·1-10
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IF 1.6
Wang Kai,Xu Jingui,Zhang Shanrong,Zhong Qifa,Zhao Wei,Fan Dawei
The equation of state of ilmenite (FeTiO 3 ) and geikielite (MgTiO 3 ) have been investigated using in situ synchrotron X-ray diffraction at high pressures up to ~ 21.8 GPa and ~ 23.0 GPa, respectively. No phase transitions were observed within the experimental pressure ranges for both samples. The pressure-volume data were fitted using the third-order Birch-Murnaghan equation of state (EoS), yielding the following results: for FeTiO 3 , the zero-pressure unit-cell volume V 0 = 312.2(1) Å 3 , the zero-pressure bulk modulus K 0 = 165(4) GPa, and its pressure derivative K ′ 0 = 6.6(6); for MgTiO 3 , V 0 = 304.17(8) Å 3 , K 0 = 157(3) GPa, and K ′ 0 = 7.3(4). Additionally, the axial compressional behavior of FeTiO 3 and MgTiO 3 were also fitted with a linearized third-order Birch-Murnaghan EoS. The axial compressibility coefficients for FeTiO 3 along the a- and c- axes are β a = 1.43(4) × 10 − 3 GPa -1 and β c = 3.17(11) × 10 − 3 GPa -1 , respectively, with an anisotropic ratio of β a : β c = 0.45: 1.00, while β a = 1.76 (7) × 10 − 3 GPa -1 and β c = 2.61(7) × 10 − 3 GPa -1 with an anisotropic ratio of β a : β c = 0.67: 1.00 for MgTiO 3 . Both FeTiO 3 and MgTiO 3 exhibit the axial compression anisotropy, of which FeTiO 3 shows stronger axial compressibility anisotropy than MgTiO 3 . Moreover, the potential influencing factors (e.g., cation radius, crystal structure, and chemical bond strength) on the bulk moduli and the anisotropic linear compressibilities of FeTiO 3 and MgTiO 3 were further discussed.
研究领域:
地球科学
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材料科学
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高影响因子
危险品化学品经营许可证（带存储）