From antiferromagnetism to field-induced ferromagnetism: A Cu-governed metamagnetic landscape in RFeCuGeO (R = Tm-Lu).

Metamagnetism represents a distinctive subclass within the antiferromagnetic (AFM) regime, exhibiting significant potential for diverse technological applications, particularly in magnetocaloric effects. In this paper, we systematically investigate the magnetic-field-induced phase transition in RFeCuGeO (R = Tm-Lu) through comprehensive temperature-dependent and field-dependent magnetization measurements and neutron powder diffraction (NPD) analysis. Our experimental results demonstrate an AFM transition at ∼18, 13 and 13.

Advanced stability and energy storage capacity in hierarchically engineered BiNaTiO-based multilayer capacitors.

Multilayer ceramic capacitors are cornerstone components of modern electronic systems. Yet ensuring reliability under demanding operational conditions, such as elevated temperatures and prolonged cycling, while achieving holistic optimization of recoverable energy density and efficiency remains a significant challenge. Herein, we implement a polar glass state strategy that catalyzes a profound enhancement in energy storage performance by modulating dynamic and thermodynamic processes.

Accelerating Low- Dielectric Material Discovery: From Graph Machine Learning to Synthesis.

The exploration of dielectric materials with a specific permittivity remains a significant challenge. Dielectric materials with low permittivity are widely used in semiconductor interlayers and communication substrates for reducing parasitic capacitance and latency transmission. However, discovering novel dielectric materials often relies on a trial-and-error strategy, which is inefficient and time-consuming.

Near-Zero Energy Dissipation Multilayer Ceramic Capacitors via Inhomogeneous Polarization Design.

Multilayer ceramic capacitors (MLCCs) demonstrate considerable potential for advance pulsed power systems, owing to their high-power density and fast charge/discharge capabilities. In light of the increasing demand for energy conservation, minimizing energy dissipation in storage capacitors while maintaining high recoverable energy densities is essential for their practical application. In this study, building upon the morphotropic phase boundary (MPB) between BiNaTiO (BNT) and NaNbO, heterogeneous cations (Ba, Zn, and Nb) are further doped using an inhomogeneous polarization design to enhance the random field.

Ultra-high energy storage in lead-free NaNbO-based relaxor ceramics with directional slush-like polar structures design.

Multilayer ceramic capacitors with ultra-high-power densities are widely used in electronic power systems. However, achieving a balance between high energy density and efficiency remains a substantial challenge that limits the practical application of advanced technologies. Here, guided by a phase-field simulation method, we propose a directional slush-like polar structure design with nanodomains embedded in polar orthorhombic matrix in NaNbO-based lead-free multilayer ceramic capacitors.

Global-optimized energy storage performance in multilayer ferroelectric ceramic capacitors.

Multilayer ceramic capacitor as a vital core-component for various applications is always in the spotlight. Next-generation electrical and electronic systems elaborate further requirements of multilayer ceramic capacitors in terms of higher energy storage capabilities, better stabilities, environmental-friendly lead-free, etc., where these major obstacles may restrict each other.

Giant dielectric tunability in ferroelectric ceramics with ultralow loss by ion substitution design.

Due to their responsiveness to modulation by external direct current fields, dielectric tunable materials are extensively utilized in integrated components, such as ferroelectric phase shifters. Barium strontium titanate ceramics have been considered the most potential tunable materials for a long time. However, the significant dielectric loss and high voltage drive have limited their further applications.

Broad-high operating temperature range and enhanced energy storage performances in lead-free ferroelectrics.

The immense potential of lead-free dielectric capacitors in advanced electronic components and cutting-edge pulsed power systems has driven enormous investigations and evolutions heretofore. One of the significant challenges in lead-free dielectric ceramics for energy-storage applications is to optimize their comprehensive characteristics synergistically. Herein, guided by phase-field simulations along with rational composition-structure design, we conceive and fabricate lead-free BiNaTiO-BiKTiO-Sr(ScNb)O ternary solid-solution ceramics to establish an equitable system considering energy-storage performance, working temperature performance, and structural evolution.

Novel Method to Achieve Temperature-Stable Microwave Dielectric Ceramics: A Case in the Fergusonite-Structured NdNbO System.

Microwave dielectric ceramics with permittivity (ε) ∼ 20 play an important role in massive multiple-input multiple-output (MIMO) technology in 5G. Although fergusonite-structured materials with low dielectric loss are good candidates for 5G application, tuning the temperature coefficient of resonant frequency (TCF) remains a problem. In the present work, smaller V ions ( = 0.

Structural Distortion and Dielectric Permittivities of KCoO-Type Layered Nitrides CaSrTiN.

Among the KCoO-type phases, the orthorhombic layered nitride CaTiN is a newly reported high dielectric permittivity material (ε ∼ 1300-2500 within 10-10 Hz from 80 to 450 K) while the tetragonal SrTiN is reported to display an unintentional metallic conduction property. In this work, a CaSrTiN solid solution was synthesized, in which the insulating SrTiN end member and some Sr-doped CaTiN samples were successfully obtained, and therefore, the dielectric properties of the CaSrTiN solid solution were investigated. The Sr substitution for Ca drove an orthorhombic-to-tetragonal phase transformation in CaSrTiN, which reduced the dielectric permittivity significantly.

Hofmann Metal-Organic Framework Monolayer Nanosheets as an Axial Coordination Platform for Biosensing.

Two-dimensional (2D) nanomaterials are remarkably attractive platform candidates for signal transduction through fluorescence resonance energy transfer or photo-induced electron-transfer pathway. In this work, a 2D Hofmann metal organic framework (hMOF) monolayer nanosheet was developed as an axial coordination platform for DNA detection via a ligand-to-metal charge-transfer quenching mechanism. Through modulating the position of phosphonate groups of rigid ligands, a layer-structured hMOF was synthesized.

Hydroxyl free radical route to the stable siliceous Ti-UTL with extra-large pores for oxidative desulfurization.

A facile and mild method was successfully developed to prepare the stable, highly siliceous Ti-UTL zeolite with extra-large pores. The hydroxyl free radical (˙OH) was introduced for the first time to effectively promote the isomorphous substitution of Si for framework Ge under room temperature and neutral conditions, resulting in a stable titanosilicate with an outstanding catalytic activity for oxidative desulfurization.

Magnetic properties of LnCoGeO and LnBCoGeO (Ln = Gd, Tb, Dy, Ho, Er; B = Sc, Lu).

Polycrystalline samples of LnCoGeO (Ln = Gd, Tb, Dy, Ho or Er) and LnBCoGeO (B = Sc or Lu) have been prepared and characterised by a combination of magnetometry, Gd Mössbauer spectroscopy and, in the case of TbCoGeO and TbScCoGeO, neutron diffraction. The holmium- and erbium-containing compositions remain paramagnetic down to 2 K, those containing dysprosium behave as spin glasses and the terbium and gadolinium-containing compounds show long-range magnetic order with transition temperatures below 4 K in all cases. The data can be rationalized qualitatively in terms of the interplay between magnetic anisotropy and crystal field effects.

Experimental and computational study of the magnetic properties of ZrMnCoGeO.

Polycrystalline samples in the solid solution ZrMnCoGeO (x = 0.0, 0.5, 1.

Magnetic Properties of CeMnCoGeO (0 ≤ x ≤ 2) as a Function of Temperature and Magnetic Field.

Polycrystalline samples, prepared by a solid-state route, of compositions in the solid solution CeMnCoGeO (x = 0.0, 0.5, 1.

Comprehensive screening for multi-class veterinary drug residues and other contaminants in muscle using column-switching UPLC-MS/MS.

A quantitative multi-class analytical method covering more than 226 veterinary drugs and other contaminants in muscle, belonging to different drug families, was developed. The method is based on liquid-liquid extraction, purification by low-temperature clean-up and dispersive solid-phase extraction (D-SPE), and analysis was conducted in two analytical runs by column-switching UPLC coupled with electrospray ionisation and tandem mass spectrometry (UPLC-ESI-MS/MS). For most of the target analytes, the optimised pre-treatment processes led to no significant interference from the sample matrix.

[Determination of nitrite and nitrate in dairy products by improved ion chromatography].

Nitrite and nitrate are common inorganic salts in the diet and drinking water. It is generally believed that excessive intake of these substances may result in methemoglobinemia or other diseases. However, the traditional detection methods for nitrite and nitrate in dairy products restrain their applications to routine analysis due to the presence of certain limitations.