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Effect of the Ba/K ratio on structural, dielectric and energy storage properties of BaO–K2O–TiO2–P2O5 glass-ceramics Ba/K比对bao - k20 - tio2 - p2o5微晶玻璃结构、介电和储能性能的影响
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-12-12 DOI: 10.13036/17533562.61.6.015
E. Haily, L. Bih, A. Bouari, A. Lahmar, M. Marssi, B. Manoun
xBaO–(20−x)K2O–30TiO2–50P2O5 with (0≤x≤20 mol%) glasses were successfully elaborated by the melt quenching while their related glass-ceramics were developed by controlled crystallisation. Density and molar volume measurements, differential thermal analysis and Raman spectroscopy were carried out to examine the glassy structure, the results revealed that the addition of BaO increases the reticulation and reinforces the glass network by the creation of strengthened linkages. X-ray diffraction has identified the formation of MTi2(PO4)3 with M=(K, Ba0·5) in all the glass-ceramics (GC) and the precipitation of a secondary BaTiP2O8 phase when x increase beyond 10 mol%. The dielectric properties of the glass-ceramics were studied by impedance spectroscopy, it showed that the addition of BaO induces an enhancement of both thermal and frequency stability of the dielectric parameters (εr and tanδ). The glass-ceramic with 5 mol% of BaO GC-(x=5) presents the highest dielectric constant and the lowest dielectric loss. The P-E hysteresis loops were recorded at room temperature and the energy storage parameters of the glass-ceramics were determined. These parameters were significantly improved by the increase of the BaO content and the optimum parameters were obtained for GC-(x=5). The dielectric and energy storage parameters were discussed according to the structure data.
采用熔体淬火法制备了(0≤x≤20 mol%)的xBaO -(20−x) K2O-30TiO2-50P2O5玻璃,并采用控制结晶法制备了相应的微晶玻璃。通过密度和摩尔体积测量、差热分析和拉曼光谱来检验玻璃结构,结果表明,BaO的加入增加了网状结构,并通过创建强化连接来强化玻璃网络。x射线衍射结果表明,当x浓度大于10 mol%时,所有微晶玻璃(GC)均形成M=(K, Ba0·5)的MTi2(PO4)3相,并析出二次相BaTiP2O8。用阻抗谱法研究了微晶玻璃的介电性能,结果表明,BaO的加入提高了微晶玻璃的介电参数εr和tanδ的热稳定性和频率稳定性。BaO GC-(x=5)含量为5 mol%的玻璃陶瓷具有最高的介电常数和最低的介电损耗。在室温下记录了P-E磁滞回线,并确定了微晶玻璃的储能参数。随着BaO含量的增加,这些参数得到了显著改善,并获得了GC-的最佳参数(x=5)。根据结构数据,讨论了介电参数和储能参数。
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引用次数: 3
The structure of oxide glasses studied by high-energy x-ray diffraction 用高能x射线衍射研究氧化玻璃的结构
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-12-12 DOI: 10.13036/17533562.61.6.KOHARA
S. Kohara, Jasri, N. Umesaki, H. Ohno, K. Suzuya, I. Sakai, Jaeri
The use of high‑energy x‑ray diffraction techniques with the latest generation synchrotron sources has created new approaches to study quantitatively the structure of noncrystalline materials. Recently, this technique has been combined with neutron diffraction at pulsed source to provide more detailed and reliable structural information not previously available. This article reviews and summarises recent results obtained from the high energy x‑ray diffraction on several oxide glasses, SiO2, B2O3 and PbSiO3, using bending magnet beamlines at SPring‑8. In particular, it addresses the structural models of the oxide glasses obtained by the reverse Monte Carlo (RMC) modelling technique using both the high energy x‑ray and neutron diffraction data.
高能x射线衍射技术与最新一代同步加速器源的使用为定量研究非晶体材料的结构创造了新的方法。最近,该技术与脉冲源的中子衍射相结合,提供了以前无法获得的更详细、更可靠的结构信息。本文回顾和总结了近年来利用SPring‑8弯曲磁束线对几种氧化玻璃SiO2、B2O3和PbSiO3进行高能x射线衍射所获得的结果。特别地,它解决了利用高能x射线和中子衍射数据的反向蒙特卡罗(RMC)建模技术获得的氧化玻璃的结构模型。
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引用次数: 0
XAFS studies of glass structure 玻璃结构的XAFS研究
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-12-12 DOI: 10.13036/17533562.61.6.DALBA
G. Dalba
X-ray absorption fine structure (XAFS) spectroscopy has become one of the most important techniques to characterise the local coordination of specific atomic species present in condensed matter. The possibility of investigating the structure of noncrystalline materials has made XAFS very attractive for the study of the short range structure of the glassy state. The XAFS acronym denotes the structure present above the x-ray absorption edges; such a structure is distinguished as x-ray absorption near edge structure (XANES) and extended x-ray absorption fine structure (EXAFS). XANES carries information on the atomic arrangement around the absorbing species: distances and bonding angles. XANES also provides information on the electronic states in the proximity of the conduction band: different chemical environments may be identified from known features in the spectrum. EXAFS provides information on the average distance and radial distribution function of the nearest neighbours of the absorbing species. In the last decade, the enormous progress of experimental techniques and the excellent quality of experimental spectra, consequent to the development of the synchrotron radiation facilities, have stimulated the evolution of the XAFS theory and analysis procedures. This paper is a survey on the theoretical development of XAFS and on the methods for determining the short range information in disordered materials. Applications of XAFS to some vitreous systems are reported.
x射线吸收精细结构(XAFS)光谱已成为表征凝聚态物质中特定原子种类局部配位的最重要技术之一。研究非晶材料结构的可能性使XAFS在研究玻璃态的短程结构方面具有很大的吸引力。XAFS缩写表示存在于x射线吸收边缘之上的结构;这种结构被区分为x射线吸收近边结构(XANES)和扩展x射线吸收精细结构(EXAFS)。XANES携带了吸收物质周围原子排列的信息:距离和成键角度。XANES还提供了有关导带附近电子状态的信息:可以从光谱中的已知特征识别不同的化学环境。EXAFS提供了吸收物质最近邻居的平均距离和径向分布函数的信息。近十年来,随着同步辐射设备的发展,实验技术的巨大进步和实验光谱的优良质量,促进了XAFS理论和分析方法的发展。本文综述了XAFS的理论发展和测定无序材料中短程信息的方法。报道了XAFS在一些玻璃体系统中的应用。
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引用次数: 0
Letter to the Editor: The extraction of atomic co-ordination numbers from x-ray diffraction data for network glasses 致编者信:从网络玻璃的x射线衍射数据中提取原子配位数
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-02-21 DOI: 10.13036/17533562.61.1.016
A. Wright
It has been demonstrated that both the detailed electron distributions of the constituent atoms/ions and non-Gaussian Gaussian peaks in T(r) can seriously limit the accuracy of co-ordination numbers extracted from x-ray diffraction data, whether the fit is performed in real or reciprocal space. In general, however, it is preferable to perform the fit in real space, where differences in shape between the experimental and fitted peaks are much more obvious, together with the effect of any experimental uncertainties, as represented by the noise in the resulting correlation function in the region below the first true peak. Note, also, that in reciprocal space the effects of a non-Gaussian peak shape on the extrapolation of the sinusoidal envelope to zero Q, from a high-Q fit to the interference function, Qi(Q), apply equally to neutron diffraction data, similarly limiting the accuracy of the resulting co-ordination numbers.
结果表明,无论是在实空间还是倒数空间进行拟合,组成原子/离子的详细电子分布和T(r)中的非高斯高斯峰都会严重限制从x射线衍射数据中提取配位数的准确性。然而,一般来说,最好在真实空间中进行拟合,因为在真实空间中,实验峰和拟合峰之间的形状差异要明显得多,而且任何实验不确定性的影响也要明显得多,这可以用第一个真峰下方区域的相关函数中的噪声来表示。还请注意,在互反空间中,非高斯峰形状对正弦包络向零Q的外推的影响,从高Q拟合到干涉函数Qi(Q),同样适用于中子衍射数据,同样限制了所得协调数的准确性。
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引用次数: 0
Corrosion resistance of CaO–Al2O3–SiO2 glasses used for flame spraying on concrete 混凝土火焰喷涂用CaO-Al2O3-SiO2玻璃的耐腐蚀性能
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-02-21 DOI: 10.13036/17533562.61.1.05
Felix Eiwen, J.-H. Pfeiler, C. Roos
Concrete components can severely suffer from corrosion during their service lifetime. To achieve higher durability, glass coatings can be applied onto the concrete surface for protection purposes. Current solutions for protection measures are either sticking thin glass panes onto the concrete or applying plastic layers using flame spraying. The aim of this work was to develop an optimised glass composition for protective layers, in order to be suitable for flame spraying on concrete. The main advantage of this process is the deposition of continuous and joint-free glass layers onto complex geometries. Dense glass layers provide a much higher corrosion resistance and lifetime compared to polymer layers. The challenge encountered by these glass coatings resides in the contact with strong acidic fluids on one side and with the alkaline concrete on the other. Therefore, a new glass appropriate for flame spraying has been developed. The composition of this glass is cheaper compared to established reference glass products while providing comparable alkaline resistance. As the acid resistance of this glass is not sufficient, in order to ensure the desired requirements of an adequate corrosion protection, a multilayer glass coating was developed, in which the first layer consists of the alkaline-resistant CaO–Al2O3–SiO2 glass and the second layer of an acid-resistant glass.
混凝土构件在其使用寿命期间会受到严重的腐蚀。为了获得更高的耐久性,可以在混凝土表面涂上玻璃涂层以起到保护作用。目前的保护措施要么是在混凝土上粘贴薄玻璃板,要么是使用火焰喷涂的塑料层。这项工作的目的是为保护层开发一种优化的玻璃成分,以便适用于混凝土上的火焰喷涂。该工艺的主要优点是在复杂的几何形状上沉积连续且无接缝的玻璃层。与聚合物层相比,致密的玻璃层具有更高的耐腐蚀性和使用寿命。这些玻璃涂层所面临的挑战在于一边与强酸流体接触,另一边与碱性混凝土接触。因此,开发了一种适合火焰喷涂的新型玻璃。与现有的参考玻璃产品相比,这种玻璃的成分更便宜,同时提供相当的耐碱性。由于这种玻璃的耐酸性能不佳,为了保证足够的防腐蚀要求,开发了多层玻璃涂层,其中第一层由耐碱性CaO-Al2O3-SiO2玻璃组成,第二层由耐酸玻璃组成。
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引用次数: 0
Density of MgO–Al2O3–SiO2, MgO–CaO–SiO2 and MgO–CaO–Al2O3–SiO2 glasses and the structural role of MgO MgO - al2o3 - sio2、MgO - cao - sio2和MgO - cao - al2o3 - sio2玻璃的密度及MgO的结构作用
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-02-21 DOI: 10.13036/17533562.61.1.12
H. Doweidar
Density and molar volume of MgO–Al2O3–SiO2, MgO–CaO–SiO2 and MgO–CaO–Al2O3–SiO2 glasses have been correlated with the structure by following the change in type and concentration of structural units with composition. It is assumed that for (MgO+CaO)≥Al2O3 all Al atoms form AlO4 tetrahedra. The type of modified units of SiO2 (Q3 and Q2) are determined by the ratio [(MgO+CaO)−Al2O3]/SiO2. In the case of (MgO+CaO)
MgO-Al2O3-SiO2、MgO-CaO-SiO2和MgO-CaO-Al2O3-SiO2玻璃的密度和摩尔体积随结构单元类型和浓度的变化而变化。假设(MgO+CaO)≥Al2O3时,所有Al原子形成AlO4四面体。SiO2 (Q3和Q2)改性单元的类型由[(MgO+CaO)−Al2O3]/SiO2的比值决定。在(MgO+CaO)
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引用次数: 3
Structure of copper tellurite and borotellurite glasses by neutron diffraction, Raman, 11B MAS-NMR and FTIR spectroscopy 用中子衍射、拉曼、11B核磁共振和红外光谱研究了碲铜和硼碲玻璃的结构
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-02-14 DOI: 10.13036/17533562.61.1.007
Amandeep Kaur, A. Khanna, P. S. R. Krishna, A. B. Shinde, M. Gonzalez-Barriuso, F. González, Banghao Chen
The structure of copper tellurite and borotellurite glasses is studied by x-ray and neutron diffraction, reverse Monte Carlo (RMC) simulations, FTIR, Raman and 11B MAS-NMR spectroscopy. Copper tellurite sample with 15 mol% CuO forms precipitates of tetragonal TeO2 within the glass matrix on melt quenching. The glass forming ability of the xCuO–(100−x)TeO2 system enhances with increase in CuO concentration from 15 to 20 mol% and also with the addition of B2O3. RMC simulations on the neutron diffraction data found that the Cu–O and Te–O bond lengths are approximately at equal distances in the range: 1·96 to 1·98±0·02 Å, while the nearest O–O distance is at 2·71±0·02 Å. Neutron and Raman results on the Te–O speciation are in agreement and confirmed that the Te–O coordination decreases with an increase in CuO and B2O3 molar concentrations in the tellurite and borotellurite glasses, respectively. RMC studies found that Cu2+ has tetrahedral coordination with oxygen, as predicted by Jahn–Teller distortion and that Cu–O and Te–O structural units have very similar size and geometry. The copper tellurite glass-ceramic sample with 15 mol% CuO was heat treated and it formed crystalline precipitates of TeO2 and CuTe2O5 upon devitrification; the average Te–O coordination was significantly smaller in the glass as compared to that in the crystalline sample.
采用x射线和中子衍射、反蒙特卡罗(RMC)模拟、红外光谱(FTIR)、拉曼光谱(Raman)和11B核磁共振光谱(MAS-NMR)研究了碲酸铜和硼碲酸铜玻璃的结构。含15mol % CuO的碲酸铜试样在熔融淬火时在玻璃基体内形成四方TeO2析出物。xCuO -(100−x)TeO2体系的玻璃化能力随着CuO浓度从15%增加到20%以及B2O3的加入而增强。对中子衍射数据的RMC模拟发现,Cu-O和Te-O键长在1.96 ~ 1.98±0.02 Å范围内近似相等,而O-O键的最接近距离为2.71±0.02 Å。在碲酸盐玻璃和硼碲酸盐玻璃中,Te-O配位随CuO和B2O3摩尔浓度的增加而减小。RMC研究发现,Cu2+与氧具有四面体配位,正如Jahn-Teller畸变所预测的那样,Cu-O和Te-O结构单元具有非常相似的尺寸和几何形状。对CuO含量为15 mol%的碲酸铜玻璃陶瓷样品进行热处理,脱硝后形成TeO2和CuTe2O5结晶析出;与晶体样品相比,玻璃中的平均Te-O配位明显更小。
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引用次数: 5
Structure and glass transition temperatures of tellurite glasses 碲酸盐玻璃的结构和玻璃化转变温度
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-02-14 DOI: 10.13036/17533562.61.1.11
B. Hauke, E. Barney, E. Pakhomenko, M. Jesuit, M. Packard, Á. Crego, G. Tarantino, M. Affatigato, S. Feller
Tellurite glasses, made from the conditional glass former TeO2, show potential for use in optical applications. Alkali and alkaline earth tellurite glasses, along with single component, rapidly cooled, TeO2 are reported and studied here. Thermal properties of boron, potassium, lithium, sodium, rubidium, cesium, barium, and strontium tellurites were obtained via differential scanning calorimetry and related to structural changes observed using Raman spectroscopy. Additionally, coordination numbers of barium and strontium tellurites versus amount of modifier are also calculated. By understanding the thermal properties and coordination numbers of alkali and alkaline earth tellurites, the goal is to better elucidate the structure of amorphous TeO2.
由条件玻璃前体TeO2制成的碲酸盐玻璃显示出在光学应用中的潜力。本文报道和研究了碱土和碱土碲酸盐玻璃以及单组分快速冷却TeO2玻璃。通过差示扫描量热法获得了硼、钾、锂、钠、铷、铯、钡和锶碲的热性质,并与拉曼光谱观察到的结构变化有关。此外,还计算了钡锶碲的配位数随改性剂用量的变化。通过了解碱土和碱土碲的热性质和配位数,目的是更好地阐明无定形TeO2的结构。
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引用次数: 4
Phase equilibria in alkali borosilicate systems: facts and fictions 碱硼硅酸盐体系的相平衡:事实与虚构
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-01-01 DOI: 10.13036/17533562.61.4.polyakova
I. Polyakova
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引用次数: 0
Novel eco-friendly fabrication of foam glass-ceramics via waste glass and fly ash from fused brown corundum 利用废玻璃和棕刚玉粉煤灰制备新型环保泡沫微晶玻璃
IF 0.6 4区 材料科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2020-01-01 DOI: 10.13036/17533562.61.3.021
Xu Nana, Yuanbing Li, Shujing Li, Xiang Ruofei, O. Si
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引用次数: 0
期刊
Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B
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