Preparation of (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy transparent ceramic using combustion synthesized nanopowder

Zhang, Kuibao; Li, Weiwei; Zeng, Jianjun; Deng, Tao; Luo, Baozhu; Zhang, Haibin; Huang, Xuegang

doi:10.1016/j.jallcom.2019.153328

Cited by 80 publications

(26 citation statements)

References 33 publications

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“…Other oxide systems of significant interests include those with the fluorite [13,23,75,76,84], spinel [29][30][31][32]96], pyrochlore [14,[33][34][35][36][37], and perovskite [24][25][26][27][28] structures.…”

Section: Graphical Abstractmentioning

confidence: 99%

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

2020

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High-entropy ceramics (HECs) have quickly gained attention since 2015. To date, nearly all work has focused on five-component, equimolar compositions. This perspective article briefly reviews different families of HECs and selected properties. Following a couple of our most recent studies, we propose a step forward to expand HECs to Compositionally Complex ceramics (CCCs) to include medium-entropy and non-equimolar compositions. Using defective fluorite and ordered pyrochlore oxides as two primary examples, we further consider the complexities of aliovalent cations and anion vacancies as well as ordered structures with two cation sublattices.Better thermally-insulating yet stiff CCCs have been found in non-equimolar compositions with optimal amounts of oxygen vacancies and in ordered pyrochlores with substantial size disorder.It is demonstrated that medium-entropy ceramics (MECs) can prevail over their high-entropy counterparts. The diversifying classes of CCCs provide even more possibilities than HECs to tailor the composition, defects, disorder/order, and, consequently, various properties.

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Section: Graphical Abstractmentioning

confidence: 99%

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

2020

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“…The reason for the low light transmittance of dielectric ceramics is the various lightscattering locations, such as residual pores on rough surfaces and second phase at grain boundaries [25][26][27]. Zhang et al [28] improved the compactness of the (K 0.5 Na 0.5 ) NbO 3 (KNN) matrix and reduced the porosity of the crystal by reducing the grain size and removing the impurities in the crystal.…”

Section: Ceramic Materialsmentioning

confidence: 99%

Preparation and Applications of Electrospun Optically Transparent Fibrous Membrane

et al. 2021

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The optically transparent electrospun fibrous membrane has been widely used in many fields due to its simple operation, flexible design, controllable structure, high specific surface area, high porosity, and unique excellent optical properties. This paper comprehensively summarizes the preparation methods and applications of an electrospun optically transparent fibrous membrane in view of the selection of raw materials and structure modulation during preparation. We start by the factors that affect transmittance among different materials and explain the light transmission mechanism of the fibrous membrane. This paper also provides an overview of the methods to fabricate a transparent nanofibrous membrane based on the electrospinning technology including direct electrospinning, solution treatment after electrospinning, heat treatment after electrospinning, and surface modification after electrospinning. It further summarizes the differences in the processes and mechanisms between different transparent fibrous membranes prepared by different methods. Additionally, we study the utilization of transparent as-spun membranes as flexible functional materials, namely alcohol dipstick, air purification, self-cleaning materials, biomedicine, sensors, energy and optoelectronics, oil–water separation, food packaging, anti-icing coating, and anti-corrosion materials. It demonstrates the high transparency of the nanofibers’ effects on the applications as well as upgrades the product performance.

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“…La2Hf2O7 透明陶瓷以来，制备出 A2B2O7 透明陶瓷就成为新型透明材料研究方向之一 [37][38][39][40][41][42] 。制备出多主元的高熵烧绿石透明陶瓷，使其具有复杂能带结构，有可能赋予其更特殊的光学性能 [43][44] 。Chen 等 [45] 通过真空热压烧结制备出高熵透明陶瓷 (CeNdCaSrBaF12)，具有单相萤石结构，最大在线透过率为 60%(@1000 nm)，拥有的独特光学性质有望应用于激光设备。 Zhang 等 [46] [38,40,[46][47] Fig. 3 (a, d, g) SEM images of final high-entropy ceramics after hot corrosion, (b, e, h) SEM images of fracture final high-entropy ceramics, (c, f, i) image of grain distribution 不同温度烧结陶瓷的 XRD 衍射峰尖锐、峰宽很窄，说明烧结使晶粒发育良好。陶瓷的 XRD 衍射图谱中检测到烧绿石特征峰(331)、 (311)和(511)，但是特征峰的强度很低，说明陶瓷为有序性低的烧绿石结构。根据 Subramanian 理论，A2B2O7 的晶体结构主要受 RA/RB 值的影响 [27] [46] 。Gd2Zr2O7 透明陶瓷在制备过程中也存在这种现象，其离子半径比(RGd/RZr)为 1.46，测试结果显示粉体为缺陷萤石结构，而块体为烧绿石结构 [48][49]…”

Section: 烁体基质和红外窗口等。自从在氢气气氛下烧结出unclassified

Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering

Zeng¹,

Zhang²,

Chen³

et al. 2021

Journal of Inorganic Materials

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High-entropy ceramic is a hot topic in the recent study of ceramic materials. High-entropy ceramics with excellent properties is the development trend of ceramic materials. In this research, high-entropy transparent ceramic was synthesized by combustion method combined with vacuum sintering. The result indicates that the mean grain size of high-entropy (La0.2Nd0.2Sm0.2Gd0.2Er0.2)2Zr2O7 powder is about 8 nm. And the high-entropy powder is disordered deficient fluorite structure. The final transparent ceramics sintering in vacuum furnace at different temperatures exhibit ordered pyrochlore structure. Sintering temperature has little effect on the transmittance of ceramics. And the in-line transmittance of as-prepared transparent ceramic can reach 74% at 1730 nm. There are many absorption peaks in the transmittance spectrum. With the increase of sintering temperature, the body density and grain size of ceramics increase, but the HV hardnesses decrease.

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Preparation of (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy transparent ceramic using combustion synthesized nanopowder

Cited by 80 publications

References 33 publications

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

Preparation and Applications of Electrospun Optically Transparent Fibrous Membrane

Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering

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Preparation of (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy transparent ceramic using combustion synthesized nanopowder

Cited by 80 publications

References 33 publications

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

Preparation and Applications of Electrospun Optically Transparent Fibrous Membrane

Preparation of (La0.2Nd0.2Sm0.2Gd0.2Er0.2)2Zr2O7 High-entropy Transparent Ceramics by Vacuum Sintering

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Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering