Ceramics International最新文献

Photoluminescence properties and crystal field analysis of a deep-red-emitting K2SrGe8O18:Mn4+ phosphor for temperature sensing and plant cultivation applications 用于温度传感和植物栽培的深红色K2SrGe8O18:Mn4+荧光粉的光致发光特性和晶体场分析

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.11.442

Weiwei Xiang , Yuxiang Li , Yongbin Hua , Li Li , Jae Su Yu

Novel deep-red-emitting K₂SrGe₈O₁₈:Mn⁴⁺ (KSGO:Mn⁴⁺) phosphors were obtained via a conventional solid-state technique. Based on them, we systematically explored their luminescence properties and investigated them for optical temperature sensing and plant growth lighting applications. X-ray diffraction and Rietveld refinement affirmed that Mn⁴⁺ ions are substituted for Ge⁴⁺ in the [GeO₆] octahedra without altering the host crystal structure. The optimal doping concentration was determined to be 1 mol% (x = 0.01), yielding an intense emission at 659 nm under near-ultraviolet excitation, originating from the spin-forbidden ²E_g → ⁴A_2g transition of Mn⁴⁺ ions. The concentration quenching mechanism was identified as an electric dipole-dipole interaction with a critical distance of 21.12 Å. Crystal field analysis revealed a strong crystal field environment (D_q/B = 2.92) and a nephelauxetic parameter, β₁ = 0.991, indicating significant covalent bonding between the Mn⁴⁺ ion and oxygen ligands. The phosphor exhibited good thermal stability, retaining 56.1 % of its room-temperature emission intensity at 423 K, with an activation energy of 0.314 eV. The maximum absolute and relative sensitivities of 1.136 % K⁻¹ and 0.347 % K⁻¹, respectively, were achieved in luminescent thermometry based on full width at half maximum over 303–483 K. The internal photoluminescence quantum yield (PLQY) reached 35.5 % while the external PLQY was 18.8 %. When fabricated into a red light-emitting diode, its emission spectrum overlapped well with the absorption bands of chlorophyll a and phytochrome P_R, enhancing watermelon seedling growth under supplementary lighting. These results demonstrate that KSGO:Mn⁴⁺ is a promising deep-red phosphor for dual-functional applications in optical temperature sensing and plant cultivation lighting.

采用传统的固态技术制备了新型深红色发光K2SrGe8O18:Mn4+ (KSGO:Mn4+)荧光粉。在此基础上，我们系统地探索了它们的发光特性，并研究了它们在光学温度传感和植物生长照明方面的应用。x射线衍射和Rietveld细化证实了Mn4+离子取代了[GeO6]八面体中的Ge4+，而没有改变基体的晶体结构。最佳掺杂浓度为1 mol% (x = 0.01)，在近紫外激发下产生659 nm的强发射，这是由于Mn4+离子的自旋禁止2Eg→4A2g跃迁引起的。浓度猝灭机制为电偶极-偶极相互作用，临界距离为21.12 Å。晶体场分析显示，Mn4+离子与氧配体之间存在较强的晶体场环境（Dq/B = 2.92）和较弱的声光参数（β1 = 0.991），表明Mn4+离子与氧配体之间存在明显的共价键。该荧光体表现出良好的热稳定性，在423 K时保持了56.1%的室温发射强度，活化能为0.314 eV。在303 ~ 483 K范围内，基于全宽度的发光测温在半最大值处获得的绝对灵敏度和相对灵敏度分别为1.136%和0.347%。内部光致发光量子产率为35.5%，外部光致发光量子产率为18.8%。制成红色发光二极管后，其发射光谱与叶绿素a和光敏色素PR的吸收带重叠良好，促进了西瓜幼苗在补光条件下的生长。这些结果表明，KSGO:Mn4+是一种具有光学温度传感和植物栽培照明双重功能的深红色荧光粉。

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引用次数: 0

SiBOC porous glasses derived from ladder-like silsesquioxanes: structure, microstructure and preliminary bioactivity 梯状硅氧烷制备的SiBOC多孔玻璃：结构、微观结构和初步生物活性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.006

Piotr Jeleń , Klaudia Łyszczarz , Maciej Bik , Jakub Marchewka , Zbigniew Olejniczak , Kamil Kornaus , Magdalena Szumera , Maciej Sitarz

Materials based on SiOC glasses, especially their modifications with boron, have gained significant interest for potential biomedical application. Introduction of boron to silicon oxycarbide affects its structure and microstructure that results in the improvement of properties such as thermal and chemical stability and surface reactivity. The research shows the process of preceramic precursors synthesis – boron modified ladder-like silsesquioxannes in the form of a sol. The materials obtained were subjected to thermal treatment to provide their transformation to xerogel and their subsequent ceramization. Each step of the SiBOC material preparation has been followed by detailed structural and microstructural studies. The final material has been subjected to the Kokubo test, which after microstructural research indicated the formation of apatite structure, confirming its surface reactivity in SBF. Presented results prove that SiBOC materials can be obtained by the process that allows to control their structure and microstructure.

基于SiOC玻璃的材料，特别是其与硼的改性，已经获得了潜在的生物医学应用的极大兴趣。在碳化硅中加入硼会影响其结构和微观结构，从而改善其性能，如热稳定性和化学稳定性以及表面反应性。该研究展示了预陶瓷前体的合成过程——以溶胶形式的硼修饰阶梯状硅氧烷。所获得的材料经过热处理，使其转化为干凝胶并随后实现陶瓷化。SiBOC材料制备的每一步都进行了详细的结构和微观结构研究。最终材料进行了Kokubo试验，经显微组织研究表明形成了磷灰石结构，证实了其在SBF中的表面反应性。结果表明，通过控制SiBOC材料的结构和微观结构，可以获得SiBOC材料。

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引用次数: 0

Enhancing energy storage characteristics of(1-x) (0.67BiFeO3-0.3BaTiO3)-x(Sr0.7Bi0.2) (Mg1/3Ta2/3)O3 ceramics 提高（1-x） (0.67BiFeO3-0.3BaTiO3)-x(Sr0.7Bi0.2) (Mg1/3Ta2/3)O3陶瓷的储能特性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.007

Meng Wang , Ting Wang

BiFeO₃–BaTiO₃ exhibits high dielectric permittivity, favorable ferroelectric properties, and structural stability, making it a promising candidate for capacitive energy storage. However, pristine BiFeO₃–BaTiO₃ ceramics typically suffer from large remanent polarization and limited breakdown strength, which reduce energy storage density and conversion efficiency. In this study, a highly relaxor component, (Sr_0.7Bi_0.2) (Mg_1/3Ta_2/3)O₃, was introduced at the B-site to form a solid solution with 0.67BiFeO₃–0.3BaTiO₃. The resulting (1–x) (0.67BiFeO₃–0.3BaTiO₃)–x(Sr_0.7Bi0.2) (Mg_1/3Ta_2/3)O₃ ceramics exhibit a single quasi-cubic perovskite phase at room temperature. Increasing SBMT content disrupts long-range ferroelectric domain alignment, enhances relaxor behavior, and reduces grain size. The x = 0.08 composition shows a maximum polarization (P_max) of 43.77 μC/cm² under 160 kV/cm, with a low remanent polarization (P_r) of 3.41 μC/cm². At moderate electric fields, it achieves a recoverable energy density (W_rec) of 2.52 J/cm³ and an energy storage efficiency (η) of 77.3 %, alongside favorable charge–discharge performance. These results indicate that the material is a promising candidate for advanced dielectric capacitor applications.

BiFeO3-BaTiO3具有较高的介电常数、良好的铁电性能和结构稳定性，是电容储能的理想材料。然而，原始的BiFeO3-BaTiO3陶瓷通常存在较大的剩余极化和有限的击穿强度，这降低了储能密度和转换效率。在本研究中，在b位点引入一种高度弛豫的组分（Sr0.7Bi0.2）（Mg1/3Ta2/3）O3，与0.67BiFeO3-0.3BaTiO3形成固溶体。所得（1-x） (0.67BiFeO3-0.3BaTiO3) -x (Sr0.7Bi0.2) (Mg1/3Ta2/3)O3陶瓷在室温下表现为单一准立方钙钛矿相。增加SBMT含量破坏了铁电畴的长程排列，增强了弛豫行为，减小了晶粒尺寸。x = 0.08的组分在160 kV/cm下的最大极化（Pmax）为43.77 μC/cm2，剩余极化（Pr）为3.41 μC/cm2。在中等电场条件下，可回收能量密度（Wrec）为2.52 J/cm3，储能效率（η）为77.3%，充放电性能良好。这些结果表明，该材料是一种很有前途的先进介质电容器的候选者。

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引用次数: 0

Influence of Zn, Ni, and Y doping on the structure and magnetism of cobalt ferrite nanoparticles prepared by citrate combustion route Zn、Ni和Y掺杂对柠檬酸盐燃烧法制备钴铁氧体纳米颗粒结构和磁性的影响

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.034

Ritambhra, Mukesh C. Dimri

The effects of Zn, Ni, and Y dopants on the structural and magnetic properties of cobalt ferrite (CoFe₂O₄) nanoparticles have been systematically investigated. The nano powders were prepared by the citrate combustion method. The formation of spinel phase crystal structure in Co_1-xZn_xFe₂O₄ (x = 0, 0.2, 0.4, 0.6), Co_0.3Ni_0.3Zn_0.4Fe₂O₄ and Co_0.8Zn_0.2Y_0.04Fe_1.96O₄ powder samples is observed for samples calcined at 600 °C and 800 °C/3 h. Crystallite sizes were observed in the nanometre range (20–60 nm), which was also confirmed from the scanning electron micrographs (SEM). Magnetic measurements at room temperature reveal that all samples exhibit ferromagnetic behaviour. Saturation magnetization (Ms) increases with Zn substitution up to x = 0.2, while higher Zn content reduces Ms; Ni co-doping further enhances Ms. In contrast, Y substitution lowers Ms but significantly increases coercivity due to grain size reduction and resulting size-induced magnetic pinning. Higher calcination temperatures promote grain growth, enhancing Ms while reducing coercivity. The magnetic anisotropy constant (K_u) increases with both dopant concentration and calcination temperature, reaching a maximum in Zn-doped samples, indicating enhanced uniaxial anisotropy. These findings demonstrate that selective cation substitution and thermal treatment can be used to achieve tuneable magnetic properties in cobalt ferrite nanoparticles, making them suitable for applications in magnetic storage and spintronic devices.

系统地研究了Zn、Ni和Y掺杂剂对钴铁氧体（CoFe2O4）纳米颗粒结构和磁性能的影响。采用柠檬酸盐燃烧法制备纳米粉体。在600°C和800°C/3 h煅烧的样品中，观察到Co1-xZnxFe2O4 （x = 0,0.2, 0.4, 0.6）、Co0.3Ni0.3Zn0.4Fe2O4和Co0.8Zn0.2Y0.04Fe1.96O4粉末样品中尖晶石相晶体结构的形成，晶粒尺寸在纳米（20-60 nm）范围内，扫描电镜（SEM）也证实了这一点。室温下的磁性测量表明，所有样品都表现出铁磁性行为。饱和磁化强度（Ms）随Zn取代量的增加而增加，直至x = 0.2，而Zn含量的增加使Ms降低；Ni共掺杂进一步提高了Ms，相比之下，Y取代降低了Ms，但由于晶粒尺寸减小和由此产生的尺寸诱导磁钉钉而显著增加了矫顽力。较高的煅烧温度促进晶粒生长，提高Ms，降低矫顽力。磁各向异性常数（Ku）随掺杂浓度和煅烧温度的增加而增大，在掺杂锌的样品中达到最大值，表明单轴各向异性增强。这些发现表明，选择性阳离子取代和热处理可以使钴铁氧体纳米颗粒获得可调谐的磁性能，使其适用于磁存储和自旋电子器件。

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引用次数: 0

LSPR-enhanced charge separation and transfer in TiO2-x/W18O49-Pd3Cu heterojunctions for photoelectrochemical performance lspr增强TiO2-x/W18O49-Pd3Cu异质结中电荷分离和转移的光电性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.043

Yue Meng , Jing Wang , Chengyi Wang

The development of advanced photoelectrochemical (PEC) systems for hydrogen production and water splitting holds great promise for addressing the global energy crisis. In this study, we designed a palladium-copper alloy nanoparticles decorated TiO_2-x/W₁₈O₄₉ heterostructure composites (TiO_2-x/W₁₈O₄₉-Pd₃Cu) as high performance photo-electrocatalyst for water splitting. The TiO_2-x/W₁₈O₄₉-Pd₃Cu composite delivered a high photocurrent density of 385 μA cm⁻² at 1.23 V vs. RHE, representing a 4.13-fold increase compared to pristine TiO_2-x. The improved performance is due to the localized surface plasmon resonance (LSPR) effects, attributed to the bimetallic Pd₃Cu cocatalyst. Furthermore, the integration of Pd₃Cu alloy not only facilitated efficient electron–hole separation but also improved the overall photostability of the system. Synergistic interactions between the oxygen-deficient TiO_2-x matrix, W₁₈O₄₉ heterojunction, and the LSPR-active Pd₃Cu nanoparticles significantly enhanced the photoelectrocatalytic activity. The improved performance was further supported by UV–vis absorption spectroscopy, photocurrent response measurements, and electrochemical impedance spectroscopy (EIS), revealing the critical roles of enhanced light absorption, accelerated charge separation, and reduced interfacial resistance in the water splitting process.

先进的光电化学制氢和水分解系统的发展为解决全球能源危机提供了巨大的希望。在这项研究中，我们设计了一种钯铜合金纳米颗粒修饰TiO2-x/W18O49异质结构复合材料（TiO2-x/W18O49- pd3cu）作为高性能光电催化剂用于水的分解。TiO2-x/W18O49-Pd3Cu复合材料在1.23 V时光电流密度高达385 μA cm−2，比原始TiO2-x提高了4.13倍。性能的提高是由于双金属Pd3Cu助催化剂的局部表面等离子体共振（LSPR）效应。此外，Pd3Cu合金的集成不仅促进了有效的电子空穴分离，而且提高了系统的整体光稳定性。缺乏氧的TiO2-x基体、W18O49异质结和lspr活性的Pd3Cu纳米粒子之间的协同作用显著增强了光电催化活性。紫外-可见吸收光谱、光电流响应测量和电化学阻抗谱（EIS）进一步支持了这种改进的性能，揭示了增强光吸收、加速电荷分离和降低界面阻力在水分解过程中的关键作用。

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引用次数: 0

Reverse co-precipitation based low-thermal-expansion cordierite ceramics: Fabrication, characterization and optical polishing properties 基于反向共沉淀法的低热膨胀堇青石陶瓷：制备、表征及光学抛光性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.11.172

Zhibo Sha , Haibin Zhang , Weiyan Gong , Yongjian Wu , Yunxiang Tong , Delong Cai

Here, a low-thermal-expansion polycrystalline ceramic was developed: cordierite gels synthesized via reverse co-precipitation (a precursor solution containing metal ions is added into a precipitating agent solution) were processed through a facile calcination and pressure-less sintering strategy to achieve cordierite ceramics with a near-zero coefficient of thermal expansion (CTE) around room temperature and excellent optical polishing properties. Interestingly, the proposed cordierite ceramics, composed primarily of the pure α-cordierite phase, exhibited a high density exceeding 99.5 % of the theoretical value, and their overall thermodynamic properties were attractive in comparison with conventional low-expansion glass and glass-ceramic materials. Specifically, the achieved near-zero CTE (−0.012/-0.022 ± 0.03 ppm/K @ 20 ± 5 °C, one specimen was measured in triplicate) of the cordierite ceramics closely matched that of ULE and Zerodur, while the specific stiffness and thermal conductivity of the cordierite ceramics were both higher than those of the reference materials. In addition, the dense cordierite ceramics demonstrated excellent machinability for optical polishing, achieving a high figure accuracy of less than λ/40 RMS (λ = 632 nm) and a high-quality surface roughness below 1 nm Ra. These findings suggest that the proposed cordierite ceramics hold significant potential as candidate materials for thermally stable optical components, such as optical mirrors in space optics.

本研究开发了一种低热膨胀的多晶陶瓷：通过反向共沉淀法（在沉淀剂溶液中加入含有金属离子的前驱体溶液）合成堇青石凝胶，通过易烧无压烧结策略，获得室温下热膨胀系数（CTE）接近于零的堇青石陶瓷，并具有优异的光学抛光性能。有趣的是，所制备的堇青石陶瓷主要由纯α-堇青石相组成，其密度超过理论值的99.5%，与传统的低膨胀玻璃和玻璃陶瓷材料相比，其整体热力学性能具有吸引力。具体而言，堇青石陶瓷的近零CTE（- 0.012/-0.022±0.03 ppm/K @ 20±5°C，一个样品被测量了三份）与ULE和Zerodur非常接近，而堇青石陶瓷的比刚度和导热系数都高于参考材料。此外，致密堇青石陶瓷在光学抛光中表现出优异的可加工性，实现了小于λ/40 RMS （λ = 632 nm）的高图形精度和低于1 nm Ra的高质量表面粗糙度。这些发现表明，堇青石陶瓷作为热稳定光学元件（如空间光学中的光学反射镜）的候选材料具有巨大的潜力。

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引用次数: 0

Microstructural characteristics and aqueous durability of Nd-doped Gd2Hf2O7 nanocrystalline ceramics as nuclear waste forms nd掺杂Gd2Hf2O7纳米晶陶瓷作为核废料形式的微观结构特征和水耐久性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.049

Pengju Chen , Hao Zhang , Nan Zhou , Xian Tang , Yanquan Ouyang , Decai Peng , Tian Tian

A series of Nd-doped nanocrystalline Gd_2-xNd_xHf₂O₇ (GNHO, 0.0 ≤ x ≤ 2.0) ceramic samples, serving as nuclear waste forms, were synthesized via the sol-gel method combined with cold pressing and sintering. The microstructure, phase evolution, Raman spectral characteristics, and aqueous durability of these GNHO samples were systematically investigated. Results revealed that all GNHO samples formed a single pyrochlore structure sintering at 1673 K for 20 h. With the increase of x_Nd from 0 to 2.0, the average grain size of the samples gradually increased from 162 nm to 294 nm, while their actual density gradually decreased from 8.21 to 7.83 g cm⁻³. After 42 days of testing, the normalized release rates of Nd and Hf elements in the Nd₂Hf₂O₇ sample were slightly lower than those of Gd and Hf elements in the Gd₂Hf₂O₇ sample. This observation can be attributed to the lower porosity of the Nd₂Hf₂O₇ specimen and the higher bond energy of Nd–O bond (∼753 kJ/mol) compared to that of Gd–O bond (∼716 kJ/mol). Furthermore, the normalized release rates of all investigated elements were below 10⁻⁵ g m⁻² d⁻¹, exhibiting excellent aqueous durability. First-principles calculations further confirmed that Nd₂Hf₂O₇ ceramic exhibits higher structural stability than Gd₂Hf₂O₇.

采用溶胶-凝胶法结合冷压-烧结法制备了一系列掺钕纳米晶Gd2-xNdxHf2O7 （GNHO, 0.0≤x≤2.0）陶瓷样品作为核废料形态。系统地研究了这些GNHO样品的微观结构、相演化、拉曼光谱特性和水性耐久性。结果表明：在1673 K下烧结20 h后，所有GNHO样品均形成单一的焦绿石结构，随着xNd从0到2.0的增加，样品的平均晶粒尺寸从162 nm逐渐增大到294 nm，而实际密度从8.21 g cm−3逐渐减小到7.83 g cm−3。42 d后，Nd2Hf2O7样品中Nd和Hf元素的标准化释放率略低于Gd2Hf2O7样品中Gd和Hf元素的标准化释放率。这一观察结果可归因于Nd2Hf2O7样品的孔隙率较低，Nd-O键的键能（~ 753 kJ/mol）高于Gd-O键（~ 716 kJ/mol）。此外，所有研究元素的标准化释放率均低于10−5 g m−2 d−1，具有良好的水性耐久性。第一性原理计算进一步证实了Nd2Hf2O7陶瓷比Gd2Hf2O7具有更高的结构稳定性。

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引用次数: 0

Zn-ion doped calcium-deficient hydroxyapatite ceramics: Synthesis, physicochemical properties, and in vitro osteogenic performance 锌离子掺杂缺钙羟基磷灰石陶瓷：合成、理化性质及体外成骨性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.155

Luhui Zhang , Jia Zhang , Jiandong Ye , Zhifeng Shi , Teliang Lu

Nanoscale calcium-deficient hydroxyapatite (CDHA) has attracted significant attention due to its chemical and structural similarity to biological apatite in natural bone. However, synthetic CDHA still exhibits inferior bioactivity compared to native bone apatite, with trace elements being a critical differentiating factor. In this study, Zn²⁺ was incorporated into the CDHA lattice via chemical precipitation, followed by ceramic processing, to systematically investigate the effects of Zn²⁺ doping concentration on the physicochemical properties and cellular responses of CDHA ceramics. Material characterization confirmed the successful fabrication of Zn-doped CDHA ceramics with varying Zn²⁺ concentrations. Zn²⁺ incorporation enhanced sintering densification (increased shrinkage rate, reduced porosity) while accelerating degradation kinetics and ion release. Notably, higher Zn²⁺ doping levels significantly promoted the proliferation and osteogenic differentiation of mouse bone marrow stromal cells (mBMSCs), as evidenced by key osteogenic markers. This study demonstrates that precise control of Zn²⁺ doping optimizes both the material properties and biological performance of CDHA ceramics, providing a promising bone graft alternative for clinical applications andfundamental insights into trace element engineering of bioactive ceramics.

纳米缺钙羟基磷灰石（CDHA）由于其化学和结构与天然骨中的生物磷灰石相似而引起了人们的广泛关注。然而，与天然骨磷灰石相比，合成的CDHA仍然表现出较差的生物活性，微量元素是一个关键的区分因素。本研究通过化学沉淀法将Zn2+掺入CDHA晶格，然后进行陶瓷加工，系统研究Zn2+掺杂浓度对CDHA陶瓷理化性质和细胞响应的影响。材料表征证实了不同Zn2+浓度的掺锌CDHA陶瓷的成功制备。Zn2+的掺入增强了烧结致密化（收缩率增加，孔隙率降低），同时加速了降解动力学和离子释放。值得注意的是，高Zn2+掺杂水平显著促进小鼠骨髓基质细胞（mBMSCs）的增殖和成骨分化，这一点得到了关键成骨标志物的证实。该研究表明，精确控制Zn2+掺杂可以优化CDHA陶瓷的材料性能和生物性能，为临床应用提供了一种有前景的骨移植替代方案，并为生物活性陶瓷的微量元素工程提供了基础见解。

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引用次数: 0

A novel exchange bias annihilation phenomenon and its physical mechanism in perovskite Yb(Cr/Fe)O3 compounds 钙钛矿Yb(Cr/Fe)O3化合物中一种新的交换偏置湮灭现象及其物理机制

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.11.330

Lei Wang , Wuxuan Zhu , Kang Zhao , Sajjad Ur Rehman

The magnetic properties of perovskite YbCr_1-xFe_xO₃ (x = 0.2, 0.3, and 0.4, mol%) have been investigated. It is found that the regulation of exchange bias field can be achieved by varying the content of B-site Fe³⁺ ions, and the exchange bias disappears when x = 0.3. This novel exchange bias annihilation phenomenon should be attributed to the transition of spin reorientation. The coupling between Yb³⁺ and Fe³⁺/Cr³⁺ ions undergoes a transition from antiferromagnetic (AFM) coupling to ferromagnetic (FM) coupling above the spin reorientation temperature with Fe³⁺concentration increasing. The exchange bias field nearly converges to zero due to the weaker pinning interaction during the process of transition. The controllable exchange bias effect will be beneficial for its application in the fields of electron spin valves and magnetic recording.

研究了钙钛矿YbCr1-xFexO3 （x = 0.2、0.3和0.4,mol%）的磁性能。发现通过改变b位Fe3+离子的含量可以实现对交换偏置场的调节，当x = 0.3时交换偏置消失。这种新的交换偏置湮灭现象应归因于自旋重取向的转变。在自旋取向温度以上，随着Fe3+浓度的增加，Yb3+与Fe3+/Cr3+离子之间的耦合经历了从反铁磁（AFM）耦合到铁磁（FM）耦合的转变。在过渡过程中，由于钉住相互作用较弱，交换偏置场几乎收敛于零。可控的交换偏置效应将有利于其在电子自旋阀和磁记录领域的应用。

引用次数: 0

Structure-modulated Er3+/Y3+ co-doped rare-earth tantalates for upconversion-based optical thermometry in thermal barrier coatings 结构调制Er3+/Y3+共掺杂稀土钽酸盐用于热障涂层的上转换光学测温

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.107

Bingao Yin, Lulu Wang, Haitong Mao

Fluorescence thermometry technology based on rare-earth optical response temperature characteristics has provided a novel technical approach for real-time temperature monitoring and lifespan prediction of thermal barrier coatings (TBCs). Rare-earth tantalate is regarded as promising candidate for intelligent TBCs, owing to its dual capabilities of serving as both thermal barrier and a temperature sensor. In this study, Er³⁺/Y³⁺co-doped rare-earth tantalates were synthesized via the Pechini sol-gel method, and their phase evolution, microstructure, upconversion luminescence (UCL), and temperature sensing behavior were systematically investigated. By modulating the RE³⁺/Ta⁵⁺ (RE = Er³⁺/Y³⁺) ratio and Er³⁺ doping concentration, a structural transition from monoclinic RETaO₄ to orthorhombic RE₃TaO₇ was achieved, which significantly influenced their luminescence efficiency and thermal response, thereby confirming that RETaO₄ is more suitable as a material for thermal barrier coatings. Within the RETaO₄ host matrix, an Er³⁺ doping concentration of 2 mol% under 980 nm excitation yielded the optimal upconversion luminescence intensity. Furthermore, the fluorescence intensity ratio (FIR) technique demonstrated its superior thermometric performance, with maximum relative sensitivity (S_r) and absolute sensitivity (S_a) values of 0.657 % K^-1 and 0.194 K^-1, respectively, at 300 K. These results highlight the potential of RETaO₄ as a high-performance, temperature-sensitive phosphor for optical sensing within thermal barrier coating environments.

基于稀土光响应温度特性的荧光测温技术为热障涂层的实时温度监测和寿命预测提供了一种新的技术途径。由于钽酸稀土具有热障和温度传感器的双重功能，因此被认为是智能tbc的理想候选材料。本研究采用Pechini溶胶-凝胶法制备了Er3+/Y3+共掺杂稀土钽酸盐，并对其相演化、微观结构、上转换发光（UCL）和感温行为进行了系统研究。通过调节RE3+/Ta5+ (RE = Er3+/Y3+)比和Er3+掺杂浓度，实现了RETaO4从单斜向RE3TaO7的结构转变，显著影响了其发光效率和热响应，从而证实了RETaO4更适合作为热障涂层材料。在RETaO4基质中，在980 nm激发下，Er3+掺杂浓度为2 mol%时产生最佳的上转换发光强度。此外，荧光强度比（FIR）技术显示了其优越的测温性能，在300 K下，最大相对灵敏度（Sr）和绝对灵敏度（Sa）分别为0.657% K-1和0.194 K-1。这些结果突出了RETaO4作为一种高性能、温度敏感的荧光粉在热障涂层环境下的光学传感潜力。

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