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Low thermal conductivity and anisotropic thermal expansion of ferroelastic(Gd_(1−x)Y_(x))TaO_(4) ceramics

Journal of Advanced Ceramics 2022年第11期11卷 1696-1713页

作者： Chenkai QU Lin CHEN Liang LV Yuncheng WANG Xiaolan JI Haitao YUN Chaoqun SU Jing FENG Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China AECC South Industry Co. Ltd.Zhuzhou 412000China

In this paper,(Gd_(1−x)Y_(x))TaO_(4) ceramics have been fabricated by solid-phase synthesis *** sample was found to crystallize in a monoclinic phase by X-ray diffraction(XRD).The properties of(Gd_(1−x)Y_(x))TaO_(4) were optimized by adjusting the ratio of Gd/Y.(Gd_(1−x)Y_(x))TaO_(4) had a low high-temperature thermal conductivity(1.37–2.05 W·m^(−1)·K^(−1)),which was regulated by lattice *** phase transition temperature of the(Gd_(1−x)Y_(x))TaO_(4) ceramics was higher than 1500℃.Moreover,the linear thermal expansion coefficients(TECs)were 10.5×10^(−6) K^(−1)(1200℃),which was not inferior to yttria-stabilized zirconia(YSZ)(11×10^(−6) K^(−1),1200℃).(Gd_(1−x)Y_(x))TaO_(4) had anisotropic thermal ***,controlling preferred orientation could minimize the TEC mismatch when(Gd_(1−x)Y_(x))TaO_(4) coatings were deposited on different substrates as thermal barrier coatings(TBCs).Based on their excellent properties,it is believed that the(Gd_(1−x)Y_(x))TaO_(4) ceramics will become the next generation of high-temperature thermal protective coatings.

关键词： thermal barrier coatings(TBCs) thermal conductivity high-temperature phase stability high-temperature X-ray diffraction(XRD) anisotropic thermal expansion

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anisotropic thermal expansion in high-entropy multicomponent AlB_(2)-type diboride solid solutions

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International Journal of Extreme Manufacturing 2023年第1期5卷 331-343页

作者： Frédéric Monteverde Mattia Gaboardi Federico Saraga Lun Feng William Fahrenholtz Gregory Hilmas National Research Council of Italy Institute of Science Technology and Sustainability for CeramicsFaenza 48018RAItaly Elettra—Sincrotrone Trieste S.C.P.A Strada Statale 14—Km 1635 in AREA Science ParkBasovizza 34149TriesteItaly Missouri University of Science and Technology RollaMO 65409United States of America AUREL Spa I-47015(ModiglianaItaly) BLUE ORIGIN 98302(KentWashington US).

High-entropy(HE)ultra-high temperature ceramics have the chance to pave the way for future applications propelling technology advantages in the fields of energy conversion and extreme environmental *** others,HE diborides stand out owing to their intrinsic anisotropic layered structure and ability to withstand ultra-high ***,we employed in-situ high-resolution synchrotron diffraction over a plethora of multicomponent compositions,with four to seven transition metals,with the intent of understanding the thermal lattice expansion following different composition or synthesis *** a result,we were able to control the average thermal expansion(TE)from 1.3×10^(−6)to 6.9×10^(−6)K^(−1)depending on the combination of metals,with a variation of in-plane to out-of-plane TE ratio ranging from 1.5 to 2.8.

关键词： ultra-high temperature ceramics borides high-entropy ceramics spark plasma sintering synchrotron diffraction anisotropic thermal expansion

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Structures and Properties of Several New Layered Perovskite Compounds of Ammonium Metal Formate

Structures and Properties of Several New Layered Perovskite ...

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中国化学会第十届全国无机化学学术会议

作者： Zhe-Ming Wang College of Chemistry and Molecular Engineering Peking University

The organic-inorganic hybrid layered perovskites are of great and continuous interest in material sciences. Here we report structures and thermal/dielectric/magnetic behaviors of several new hybrid layered ammonium metal formate perovskite compounds of [NHCl][Ni(HCOO)(NH)](1), [CHC(NH)][M(HCOO)](2 and 3 for M = Co and Ni respectively) and [(CH)(NH)][Mn(HCOO)](4). The structures consists of metal formate perovskite layers and the interlayer ammonium components. 1 undergoes a ferro-to ferro-electric transition around 110 K and a para-to antiferro-magnetic transition at 25 K, in which both electric and magnetic polarizations turn from the direction perpendicular to the layers to the direction parallel to the layers. 2 to 4 shows anisotropically thermal expansions, depending on the most vibration directions of the interlayer components. They are all weak ferromagnets, and the Néel temperatures are 6.0 K(2), 17.0 K(3), and 4.0 K(4), respectively. The magnetic studies on the single crystals of 2 and 4 have further revealed that the orthorhombic 2 has the magnetization easy axis along the a direction, in the perovskite layer, and the spin-canting direction along b(in layer) or c(perpendicular to the layer) direction. For monoclinic 4 the magnetization easy axis is b in the perovskite layer, and the spin-canting direction is along a* perpendicular to the layer. The ground states of 2 and 4 are antiferromagnetic because the weak-ferromagnetic layers are antiferromagnetically coupled. They thus show meta-magnetic transitions further spin-flop by applied magnetic field.

关键词： ammonium-metal-formate hybrid layered perovskite dielectric and magnetic properties anisotropic thermal expansion

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