Solid State Sciences最新文献

Dual-functional high-crystalline 3D core-shell hexagonal tubular sulfur-doped carbon nitride for enhanced photocatalytic H2 production and simultaneously pollutants degradation 双功能高结晶三维核壳六角管状掺硫氮化碳，用于增强光催化制取 H2 的能力并同时降解污染物

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-13 DOI: 10.1016/j.solidstatesciences.2024.107757

Jiachun Wu, Huixia Li, Yanjuan Cui

The use of semiconductor photocatalytic technology for water splitting to produce H₂ and degrade pollutants is a mild approach for clean energy conversion and environmental water purification. However, the rational design of photocatalysts with high carrier mobility remains a challenge. Herein, high-crystalline 3D core-shell hollow porous hexagonal tubular sulfur-doped carbon nitride (S-TCN) was synthesized through a simple and environmentally friendly supramolecular self-assembly strategy combined with a “salt-sealing” technique. This unique 3D structure facilitates the utilization of incident light, increases the active reaction sites, and improves interfacial mass transfer. The “salt-sealing” technique effectively enhances its crystallinity, while sulfur doping modification reduces the band gap and promotes separation and transfer of photogenerated carriers. Depend on the synergistic effect of morphology modulation, elemental doping, and high crystallinity, S-TCN exhibits significantly enhanced photoelectric conversion efficiency. It not only shows excellent performance for photocatalytic H₂ production in pure water, but also rapidly degrades pollutants while maintaining H₂ production activity in wastewater. The development of this dual-functional photocatalytic material holds important guiding significance for expanding the efficient application of polymer semiconductors.

利用半导体光催化技术进行水分离以产生 H2 和降解污染物，是一种温和的清洁能源转换和环境水净化方法。然而，如何合理设计具有高载流子迁移率的光催化剂仍是一项挑战。本文通过一种简单、环保的超分子自组装策略，结合 "盐封 "技术，合成了高晶三维核壳空心多孔六角管状掺硫氮化碳（S-TCN）。这种独特的三维结构有利于入射光的利用，增加了活性反应位点，并改善了界面传质。盐封 "技术有效地提高了其结晶度，而硫掺杂改性则降低了带隙，促进了光生载流子的分离和转移。在形貌调制、元素掺杂和高结晶度的协同作用下，S-TCN 的光电转换效率显著提高。它不仅在纯水光催化制取 H2 方面表现出色，而且还能在废水中快速降解污染物，同时保持制取 H2 的活性。这种双功能光催化材料的开发对于拓展聚合物半导体的高效应用具有重要的指导意义。

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引用次数: 0

Magnetocrystalline anisotropy and giant spontaneous magnetostriction in iron selenide Fe3Se4 studied on single crystals 在单晶体上研究硒化铁 Fe3Se4 的磁晶各向异性和巨大自发磁致伸缩性

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-09 DOI: 10.1016/j.solidstatesciences.2024.107756

V.A. Komarova , V.A. Kazantsev , S.N. Mozgovykh , A.S. Volegov , N.V. Selezneva , N.V. Baranov

Using the modified Bridgman method, a single-crystalline sample of iron selenide Fe₃Se₄ was grown and its magnetization and thermal expansion behavior was studied along different crystallographic directions. In a ferrimagnetically ordered state below T_N = 345 K, the magnetization curves show that the magnetic moments do not lie strictly in the plane perpendicular to the c axis. The magnetocrystalline anisotropy constants, determined from the M(H) dependences along and across to the c axis, are K₁ = −3.9⋅10⁷ erg/cm³, K₂ = 5.0⋅10⁶ erg/cm³ at 4 K. Magnetic ordering in Fe₃Se₄ upon cooling below T_N is accompanied by anisotropic deformations of the crystal lattice: expansion along the c axis and compression across the c axis. Spontaneous volume magnetostriction is positive and reaches a giant value of about 1.2⋅10⁻² at 80 K. The pressure derivative of the Néel temperature is estimated using the Ehrenfest ratio as of dT_N/dp ≈ − 2.1 K/kbar. The results obtained show that the properties of Fe₃Se₄ are strongly influenced by magnetoelastic interactions.

利用改进的布里奇曼方法，制备了硒化铁 Fe3Se4 的单晶样品，并沿不同的晶体学方向研究了其磁化和热膨胀行为。在 TN = 345 K 以下的铁磁有序态中，磁化曲线显示磁矩并不严格位于垂直于 c 轴的平面内。根据沿 c 轴和横 c 轴的 M(H) 相关性确定的磁晶各向异性常数在 4 K 时为 K1 = -3.9⋅107 erg/cm3，K2 = 5.0⋅106 erg/cm3。Fe3Se4 中的磁有序性在冷却到 TN 以下时伴随着晶格的各向异性变形：沿 c 轴膨胀和跨 c 轴压缩。自发体积磁致伸缩为正值，在 80 K 时达到约 1.2⋅10-2 的巨值。内耳温度的压力导数是利用艾伦费斯特比率估算的，即 dTN/dp ≈ - 2.1 K/kbar。所得结果表明，Fe3Se4 的特性受到磁弹性相互作用的强烈影响。

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引用次数: 0

In situ synthesis of metal-organic frameworks on sulfonated cellulose nanofibrils 在磺化纤维素纳米纤维上原位合成金属有机框架

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-09 DOI: 10.1016/j.solidstatesciences.2024.107755

Kailong Zhang , William Hutcherson , Neal D. Evans , Thomas Elder , Charles M. Garner , Mi Li

The intrinsic fragility and inferior processibility of metal-organic frameworks (MOFs) particles often restrict their functional application despite their high surface area and porous structure. We investigated the feasibility of sulfonated cellulose nanofibrils (SCNF) as a biopolymer template to hybridize MOFs. SCNF was synthesized through periodate oxidation followed by bisulfite sulfonation. The sulfonate groups increased electronegativity and enhanced the dispersibility of the cellulose fibers. More importantly, the negatively charged sulfonates could serve as anchors for metal ions to initiate the in situ growth of MOFs along the surface of cellulose fibers. We have achieved the synthesis of three types of SCNF/MOF hybrids, namely, SCNF/ZIF-8, SCNF/ZIF-67, and SCNF/HKUST-1. These hybrids can be formed as free-standing aerogels, exhibiting remarkably high surface areas and flexibility for applications. The assessment of the adsorptive efficiency of the SCNF/ZIF-8 hybrid indicates that the hybrid material exhibited a notably higher adsorption capacity for methylene blue versus the SCNF control. DFT calculation provides further insights into the underlying adsorption mechanisms, revealing that the sulfonates on the SCNF and the nitrogen atoms in the ZIF-8 ligands primarily contributed to the affinity for methylene blue. SCNF offers a versatile and robust biopolymer substrate for templating a wide array of MOFs with promising applications as adsorbents and beyond.

尽管金属有机框架（MOFs）颗粒具有高比表面积和多孔结构，但其固有的脆弱性和较差的可加工性往往限制了其功能性应用。我们研究了磺化纤维素纳米纤维（SCNF）作为生物聚合物模板与 MOFs 杂交的可行性。SCNF 是通过高碘酸氧化法合成的，然后进行亚硫酸氢盐磺化。磺酸盐基团增加了电负性，提高了纤维素纤维的分散性。更重要的是，带负电荷的磺酸盐可以作为金属离子的锚定物，启动 MOFs 沿纤维素纤维表面的原位生长。我们已经合成了三种 SCNF/MOF 混合物，即 SCNF/ZIF-8、SCNF/ZIF-67 和 SCNF/HKUST-1。这些混合物可以形成独立的气凝胶，具有显著的高比表面积和应用灵活性。对 SCNF/ZIF-8 混合物吸附效率的评估表明，与 SCNF 对照组相比，混合物材料对亚甲基蓝的吸附能力明显更高。DFT 计算进一步揭示了潜在的吸附机制，发现 SCNF 上的磺酸盐和 ZIF-8 配体中的氮原子是亚甲基蓝亲和力的主要来源。SCNF 提供了一种多功能、坚固耐用的生物聚合物基质，可用于模板化各种 MOFs，在吸附剂及其他方面具有广阔的应用前景。

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引用次数: 0

The dielectric characteristics of spray deposited α-Si3N4:ZnO thin films: The nitride effect on frequency-dependent capacitance and conductance profiles 喷雾沉积 α-Si3N4:ZnO 薄膜的介电特性：氮化物对频率相关电容和电导曲线的影响

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-07 DOI: 10.1016/j.solidstatesciences.2024.107754

Erhan İbrahimoğlu , Ahmet Demir , Fatih Çalışkan , Zafer Tatlı

The study focused on the effect of α-Si₃N₄ doping on the electrical/dielectric properties of ZnO thin films. Both α-Si₃N₄ doped and additive-free ZnO thin films were coated on p-Si substrates via a spray deposition method to achieve this. The electrical (current density (J)-voltage (V)) and dielectric properties (capacitance (C), conductance (G), dielectric loss (tanδ), reel/imaginary part of dielectric permittivity (ε′ and ε″) and electric modulus (M′ and M″)) were determined for all samples by using dielectric spectroscopy (DS) method. On the other hand, scanning electron microscopy (FESEM) and energy-dispersive spectroscopy (EDS) analysis were performed to evaluate microstructure, X-ray diffraction (XRD) was used to define chemical composition and atomic-force microscopy (AFM) analysis was carried out to characterise the topology of the coating layers. The thickness/surface roughness was obtained as ∼82.5 nm/10.6 nm for undoped and ̴ 99.5 nm/10.4 nm for nitride-doped samples, respectively. The maximum capacitance value (C) was obtained as 275 pF at −3.0V and 200 Hz, and the optimal conductance (G) value was also found as 45 μS around 4.0V and 1 MHz in the nitride-doped sample. The average of α and τ values was calculated as 5.67 × 10⁻⁵ s, 0.146 and 4.49 × 10⁻⁵ s, 0.081 for nitride-doped and undoped ZnO, respectively. The increase in performance can be attributed to the homogeneous and almost equally-size distribution of the ZnO grain growth which is strongly controlled by α-Si₃N_4.

研究重点是掺杂α-Si3N4对氧化锌薄膜电学/介电性能的影响。为此，研究人员采用喷雾沉积法在对硅衬底上镀上了掺杂了 α-Si3N4 和无添加剂的氧化锌薄膜。所有样品的电性能（电流密度（J）-电压（V））和介电性能（电容（C）、电导（G）、介电损耗（tanδ）、介电常数的卷积/虚部（ε′和ε″）以及电模量（M′和M″））都是通过介电光谱法（DS）测定的。另一方面，扫描电子显微镜（FESEM）和能量色散光谱（EDS）分析用于评估微观结构，X 射线衍射（XRD）用于确定化学成分，原子力显微镜（AFM）分析用于表征涂层层的拓扑结构。未掺杂样品的厚度/表面粗糙度分别为 ∼82.5 nm/10.6 nm，掺氮化物样品的厚度/表面粗糙度分别为 ̴ 99.5 nm/10.4 nm。掺氮样品在 -3.0V 和 200 Hz 时的最大电容值 (C) 为 275 pF，在 4.0V 和 1 MHz 时的最佳电导 (G) 值为 45 μS。经计算，掺氮和未掺氮氧化物的 α 和 τ 值平均值分别为 5.67 × 10-5 s, 0.146 和 4.49 × 10-5 s, 0.081。性能的提高可归因于 ZnO 晶粒生长的均匀性和几乎相同大小的分布，而这在α-Si3N4 的强烈控制下得以实现。

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引用次数: 0

New quaternary R2CoAl4Si2 compounds 新型 R2CoAl4Si2 季化合物

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-06 DOI: 10.1016/j.solidstatesciences.2024.107749

Svitlana Pukas, Kateryna Kravets, Pavlo Demchenko, Nataliya Semuso, Roman Gladyshevskii

Eight new R₂CoAl₄Si₂ silicides (R = Y, Gd-Yb) were synthesized by arc melting, and their crystal structures were studied by X-ray powder diffraction. The compounds were found to adopt the same tetragonal structure type Tb₂NiAl₄Ge₂ (Pearson symbol tI18, space group I4/mmm) and the cell parameters refined to: a = 4.09319 (6), c = 19.3431 (4) Å (R = Y), a = 4.1109 (3), c = 19.425 (2) Å (R = Gd), a = 4.09788 (8), c = 19.3616 (5) Å (R = Tb), a = 4.0850 (1), c = 19.2967 (8) Å (R = Dy), a = 4.07802 (2), c = 19.2575 (2) Å (R = Ho), a = 4.06871 (8), c = 19.2082 (5) Å (R = Er), a = 4.05836 (4), c = 19.1599 (4) Å (R = Tm), and a = 4.06627 (6), c = 4.06627 (6) Å (R = Yb). Isotypic compounds with R = Sm, Lu were not observed under the experimental conditions.

The structure type Tb₂NiAl₄Ge₂ is a quaternary variant of the prototype Yb₃S₂F₄ ≡ (NiGe₂)Tb₂Al₄. The structure of the R₂CoAl₄Si₂ compounds can be described as a packing of monocapped square antiprisms [SiAl₄R₅] and cubes [CoAl₈]. It can also be considered as formed by two types of layer containing cubes, stacked along the crystallographic direction [001]. One kind of layer is built of cubes of composition Al₈, with every second cube centered by a Co atom, while the other kind of layer consists of slightly deformed empty cubes of composition R₄Si₄.

通过电弧熔融法合成了八种新的 R2CoAl4Si2 硅化物（R = Y，Gd-Yb），并利用 X 射线粉末衍射法研究了它们的晶体结构。发现这些化合物采用相同的四方结构类型 Tb2NiAl4Ge2（皮尔逊符号 tI18，空间群 I4/mmm），晶胞参数细化为：a = 4.09319 (6)，c = 19.3431 (4) Å (R = Y)；a = 4.1109 (3)，c = 19.425 (2) Å (R = Gd)；a = 4.09788 (8)，c = 19.3616 (5) Å (R = Tb)，a = 4.0850 (1)，c = 19.2967 (8) Å (R = Dy)，a = 4.07802 (2)，c = 19.2575 (2) Å (R = Ho)，a = 4.06871 (8)，c = 19.2082 (5) Å (R = Er)，a = 4.05836 (4)，c = 19.1599 (4) Å (R = Tm)，以及 a = 4.06627 (6)，c = 4.06627 (6) Å (R = Yb)。Tb2NiAl4Ge2 结构类型是 Yb3S2F4 ≡ (NiGe2)Tb2Al4 原型的四元变体。R2CoAl4Si2 化合物的结构可以描述为单帽方形反棱柱[SiAl4R5]和立方体[CoAl8]的堆积。也可以认为它是由两种含有立方体的层沿晶体学方向堆叠而成[001]。一种晶层由成分为 Al8 的立方体构成，每第二个立方体都以一个 Co 原子为中心，而另一种晶层则由成分为 R4Si4 的轻微变形空立方体构成。

{"title":"New quaternary R2CoAl4Si2 compounds","authors":"Svitlana Pukas, Kateryna Kravets, Pavlo Demchenko, Nataliya Semuso, Roman Gladyshevskii","doi":"10.1016/j.solidstatesciences.2024.107749","DOIUrl":"10.1016/j.solidstatesciences.2024.107749","url":null,"abstract":"<div><div>Eight new R2CoAl4Si2 silicides (R = Y, Gd-Yb) were synthesized by arc melting, and their crystal structures were studied by X-ray powder diffraction. The compounds were found to adopt the same tetragonal structure type Tb2NiAl4Ge2 (Pearson symbol tI18, space group I4/mmm) and the cell parameters refined to: a = 4.09319 (6), c = 19.3431 (4) Å (R = Y), a = 4.1109 (3), c = 19.425 (2) Å (R = Gd), a = 4.09788 (8), c = 19.3616 (5) Å (R = Tb), a = 4.0850 (1), c = 19.2967 (8) Å (R = Dy), a = 4.07802 (2), c = 19.2575 (2) Å (R = Ho), a = 4.06871 (8), c = 19.2082 (5) Å (R = Er), a = 4.05836 (4), c = 19.1599 (4) Å (R = Tm), and a = 4.06627 (6), c = 4.06627 (6) Å (R = Yb). Isotypic compounds with R = Sm, Lu were not observed under the experimental conditions.</div><div>The structure type Tb2NiAl4Ge2 is a quaternary variant of the prototype Yb3S2F4 ≡ (NiGe2)Tb2Al4. The structure of the R2CoAl4Si2 compounds can be described as a packing of monocapped square antiprisms [SiAl4R5] and cubes [CoAl8]. It can also be considered as formed by two types of layer containing cubes, stacked along the crystallographic direction [001]. One kind of layer is built of cubes of composition Al8, with every second cube centered by a Co atom, while the other kind of layer consists of slightly deformed empty cubes of composition R4Si4.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"158 ","pages":"Article 107749"},"PeriodicalIF":3.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of substrate dependent microstructural properties of sputtered Mo/CZTS heterojunctions using X ray diffraction 利用 X 射线衍射研究溅射钼/CZTS 异质结的基底相关微结构特性

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-06 DOI: 10.1016/j.solidstatesciences.2024.107739

Kalyan B. Chavan , Sachin V. Desarada , Shweta Chaure , Nandu B. Chaure

Thin films of CZTS (Cu₂ZnSnS₄) were deposited using radiofrequency sputtering (RF) at varying sputtering powers on soda lime glass coated with molybdenum (Mo). Direct current (DC) sputtering was used to deposit Mo thin films at various sputtering powers. Rapid thermal processing (RTP) was employed to anneal the thin films that had been deposited at temperatures of 300, 400, and 500 °C. X ray diffraction (XRD) technique was used to probe thin films structurally. The microstructural characteristics, such as crystallite size and microstrain, were calculated. These properties, particularly crystallite size and microstrain, are critical in future applications as an absorber layer in a thin film solar cell. A comprehensive comparative study has been carried out using Scherrer method, Williamson-Hall method, Halder-Wagner method, Size-Strain plot method, and Wagner-Aqua method. Crystallite size and microstrain obtained in this work shows strong dependence on preferential orientation of DC sputtered Mo base layer. Crystallite size, microstrain measured shows similar trends. Microstrain obtained exhibits systematic relationship with variation in deposition parameters of DC sputtered Mo thin films and RF sputtered CZTS thin films. This dependency of CZTS microstructural features on base layer Mo growth conditions can be used in the future to apply CZTS as a solar cell absorber layer.

在涂有钼（Mo）的钠钙玻璃上使用射频溅射（RF）技术以不同的溅射功率沉积了 CZTS（Cu2ZnSnS4）薄膜。在不同的溅射功率下，采用直流溅射沉积钼薄膜。在 300、400 和 500 °C 的温度下，采用快速热处理 (RTP) 对沉积的薄膜进行退火。X 射线衍射 (XRD) 技术用于从结构上探测薄膜。计算了结晶尺寸和微应变等微观结构特征。这些特性，尤其是晶粒尺寸和微应变，对于未来作为薄膜太阳能电池吸收层的应用至关重要。我们使用舍勒法、威廉森-霍尔法、哈尔德-瓦格纳法、尺寸-应变图法和瓦格纳-水法进行了全面的比较研究。这项研究获得的晶体尺寸和微应变与直流溅射钼基底层的优先取向有很大关系。所测得的晶体尺寸和微应变显示出相似的趋势。获得的微应变与直流溅射钼薄膜和射频溅射 CZTS 薄膜沉积参数的变化呈现出系统关系。CZTS 的微观结构特征与基底层钼生长条件的这种依赖关系可用于将来将 CZTS 用作太阳能电池吸收层。

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引用次数: 0

A DFT exploration of the stabilities, physical properties, and tensile strength of new synthesized Nb2AC (A=Ni and Co) MAX phases 对新合成的 Nb2AC（A=镍和钴）MAX 相的稳定性、物理性质和拉伸强度的 DFT 探索

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-05 DOI: 10.1016/j.solidstatesciences.2024.107733

Mourad Rougab, Ahmed Gueddouh

Based on first-principles calculations, this study explored the structural stability, elastic anisotropy, tensile strength, and the mechanical, electronic, and thermodynamic properties of the newly synthesized MAX phases Nb₂NiC and Nb₂CoC. It has been found that these compounds are thermodynamically and mechanically stable, exhibit metallic conductivity, and possess ductile nature. The ultimate tensile strengths of Nb₂NiC and Nb₂CoC depend on their crystallographic directions, specifically [0001] and [112̄0]. In the [0001] direction, Nb₂CoC has a tensile strength of about 36.63 GPa at a strain of 26%, compared to Nb₂NiC, which has a tensile strength of 31.70 GPa at a strain of 24%. In the [112̄0] direction, Nb₂CoC exhibits a tensile strength of around 23.29 GPa at a strain of 12%, while Nb₂NiC has a tensile strength of approximately 18.51 GPa at an strain of 8%. Both Nb₂CoC and Nb₂NiC demonstrate significant elastic deformation before reaching their ultimate tensile strengths, indicating good ductility. It is noteworthy that Nb₂NiC is less elastic than Nb₂CoC in both the [0001] and [112̄0] directions, as the elastic constants of Nb₂CoC are comparatively higher than those of Nb₂NiC. Furthermore, the estimated thermal parameters show that these compounds exhibit a relatively low Debye temperature, a high melting point, low minimum thermal conductivity, and thermal expansion coefficient values that are similar to those of well-established thermal barrier coating (TBC) materials such as Al

_{2}

O

_{3}

, LaPO

_{4}

, and TiO

_{2}

. Consequently, the newly synthesized MAX phases Nb₂NiC and Nb₂CoC are promising candidates for TBC applications.

本研究基于第一原理计算，探讨了新合成的 MAX 相 Nb2NiC 和 Nb2CoC 的结构稳定性、弹性各向异性、拉伸强度以及机械、电子和热力学性质。研究发现，这些化合物具有热力学和机械稳定性、金属导电性和韧性。Nb2NiC 和 Nb2CoC 的极限拉伸强度取决于其晶体学方向，特别是 [0001] 和 [112̄0]。在[0001]方向，Nb2CoC 在应变为 26% 时的抗拉强度约为 36.63 GPa，而 Nb2NiC 在应变为 24% 时的抗拉强度为 31.70 GPa。在[112̄0]方向，Nb2CoC 在应变为 12% 时的抗拉强度约为 23.29 GPa，而 Nb2NiC 在应变为 8% 时的抗拉强度约为 18.51 GPa。在达到极限抗拉强度之前，Nb2CoC 和 Nb2NiC 都表现出明显的弹性变形，这表明它们具有良好的延展性。值得注意的是，在[0001]和[112̄0]两个方向上，Nb2NiC 的弹性都小于 Nb2CoC，因为 Nb2CoC 的弹性常数相对高于 Nb2NiC。此外，估算的热参数显示，这些化合物具有相对较低的德拜温度、较高的熔点、较低的最小热导率，以及与 Al2O3、LaPO4 和 TiO2 等成熟的热障涂层 (TBC) 材料相似的热膨胀系数值。因此，新合成的 MAX 相 Nb2NiC 和 Nb2CoC 有希望成为 TBC 应用的候选材料。

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引用次数: 0

ZnO/Zn3(PO4)2/CeO2 photocatalysts formed on zinc by plasma electrolytic oxidation 等离子电解氧化法在锌上形成 ZnO/Zn3(PO4)2/CeO2 光催化剂

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-05 DOI: 10.1016/j.solidstatesciences.2024.107748

Stevan Stojadinović , Ziv Radisavljevic , Zoran Petrović , Nenad Radić

ZnO/Zn₃(PO₄)₂ coatings doped with CeO₂ particles for use in photocatalytic degradation of methyl orange (MO) were created by plasma electrolytic oxidation of zinc in a phosphate alkaline electrolyte (PAE) with CeO₂ particle concentrations of up to 1.5 g/L. The CeO₂ particle content in ZnO/Zn₃(PO₄)₂ coatings was determined by the concentration of CeO₂ particles in the PAE. Extensive research was conducted on coating morphology, chemical and phase compositions, and light-harvesting properties. The photocatalytic activity (PA) of ZnO/Zn₃(PO₄)₂/CeO₂ coatings was higher than ZnO/Zn₃(PO₄)₂. The PA of ZnO/Zn₃(PO₄)₂/CeO₂ coatings strongly depends on the amount of CeO₂ particles in PAE, and the highest PA was observed for ZnO/Zn₃(PO₄)₂/CeO₂ coating formed in PAE by adding 0.75 g/L of CeO₂ particles. The higher PA of ZnO/Zn₃(PO₄)₂/CeO₂ compared to ZnO/Zn₃(PO₄)₂ is due to a lower photogenerated electron/hole recombination. The photocatalytic degradation of MO followed a pseudo-first order kinetic model and the reaction constant of the most photoactive ZnO/Zn₃(PO₄)₂/CeO₂ coating was increased about twofold compared to the ZnO/Zn₃(PO₄)₂ coating. After 6 h of irradiation, the PA for ZnO/Zn₃(PO₄)₂ and the most photocatalytically active ZnO/Zn₃(PO₄)₂/CeO₂ was about 70 % and 98 %, respectively. A mechanism for the photodegradation of MO with the ZnO/Zn₃(PO₄)₂/CeO₂ photocatalyst was also proposed.

通过在磷酸盐碱性电解液（PAE）中对锌进行等离子电解氧化，在 CeO2 颗粒浓度高达 1.5 g/L 的情况下，制备出了掺杂有 CeO2 颗粒的 ZnO/Zn3(PO4)2 涂层，用于光催化降解甲基橙（MO）。ZnO/Zn3(PO4)2 涂层中的 CeO2 颗粒含量由 PAE 中 CeO2 颗粒的浓度决定。对涂层的形态、化学成分和相组成以及光收集特性进行了广泛的研究。ZnO/Zn3(PO4)2/CeO2 涂层的光催化活性（PA）高于 ZnO/Zn3(PO4)2。ZnO/Zn3(PO4)2/CeO2 涂层的 PA 与 PAE 中 CeO2 颗粒的含量密切相关，在 PAE 中加入 0.75 g/L 的 CeO2 颗粒形成的 ZnO/Zn3(PO4)2/CeO2 涂层的 PA 最高。与 ZnO/Zn3(PO4)2 相比，ZnO/Zn3(PO4)2/CeO2 的 PA 较高，这是因为光生电子/空穴重组较低。MO 的光催化降解遵循伪一阶动力学模型，与 ZnO/Zn3(PO4)2 涂层相比，光活性最强的 ZnO/Zn3(PO4)2/CeO2 涂层的反应常数增加了约两倍。辐照 6 小时后，ZnO/Zn3(PO4)2 和光催化活性最高的 ZnO/Zn3(PO4)2/CeO2 的 PA 分别为 70% 和 98%。此外，还提出了 ZnO/Zn3(PO4)2/CeO2 光催化剂光降解 MO 的机理。

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引用次数: 0

Synthesis and characterization of Sr2Cu3O4I2 Sr2Cu3O4I2 的合成与表征

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-05 DOI: 10.1016/j.solidstatesciences.2024.107750

Danrui Ni , Xianghan Xu , Chen Yang , Robert J. Cava

Polycrystalline Sr₂Cu₃O₄I₂ powder was synthesized. Its crystal structure is based on Cu₃O₄ planes, which a previous structural study indicates consist of two kinds of copper. Its metastability on heating is uncovered. The magnetization and heat capacity of the material are characterized, and it undergoes several magnetic ordering transitions in an easily accessible temperature range. A band-gap-like absorption is observed in the IR region.

合成了多晶 Sr2Cu3O4I2 粉末。它的晶体结构以 Cu3O4 平面为基础，先前的结构研究表明它由两种铜组成。研究揭示了其在加热时的蜕变性。该材料的磁化和热容量得到了表征，并在容易获得的温度范围内发生了几次磁有序转变。在红外区域观察到类似带隙的吸收。

引用次数: 0

Synthesis of Nd2Sn2O7 pyrochlore with different lattice disorder degrees and oxygen vacancy contents 不同晶格无序度和氧空位含量的 Nd2Sn2O7 烧绿宝石的合成

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-04 DOI: 10.1016/j.solidstatesciences.2024.107740

Liang Guo , Junwei Xu , Rumeng Ouyang , Jieqi Zhou , Xiaomei Yu , Xiuzhong Fang , Chunhui Deng , Xiang Wang

In this study, a series of Nd₂Sn₂O₇ pyrochlores with different lattice disorder degrees and oxygen vacancy contents were prepared via simple methods, including the sol–gel (SG) technique, glycine–nitrate combustion (GNC), coprecipitation (CP), and the hydrothermal (HT) method. Raman spectroscopy proved the most effective in identifying the lattice disorder degree and lattice defects of the pyrochlore-type composite oxides, followed by XRD, with FTIR spectroscopy as the least sensitive technique. For pure phase Nd₂Sn₂O₇, the content of oxygen vacancies and adsorbed oxygen species follow the sequence CP > GNC > SG, which is well consistent with the lattice disorder degrees. This is because that the higher the lattice disorder of Nd₂Sn₂O₇ pyrochlore, the weaker the Sn-O bond, making it easier to break and form oxygen vacancies. Although the HT sample exhibits the lowest disorder degree, its synergistic effect with residual SnO₂ on the surface is beneficial for further enriching oxygen vacancies.

本研究通过溶胶-凝胶（SG）技术、硝酸甘油燃烧（GNC）、共沉淀（CP）和水热法（HT）等简单方法制备了一系列具有不同晶格无序度和氧空位含量的 Nd2Sn2O7 热长石。事实证明，拉曼光谱在确定热绿石型复合氧化物的晶格无序度和晶格缺陷方面最为有效，其次是 XRD，而傅立叶红外光谱则是灵敏度最低的技术。对于纯相 Nd2Sn2O7，氧空位和吸附氧的含量遵循 CP > GNC > SG 的序列，这与晶格无序度十分吻合。这是因为 Nd2Sn2O7 烧绿石的晶格无序度越高，Sn-O 键就越弱，更容易断裂并形成氧空位。虽然 HT 样品的无序度最低，但它与表面残留的 SnO2 的协同效应有利于进一步富集氧空位。

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