In this work, BiPO4:Eu of three different polymorphs was prepared using a room-temperature reaction followed by heat treatment. The formation mechanism, morphologies, structures, and luminescence properties these were investigated in detail. It is found that hexagonal phase (HP) formed at room temperature, which transformed to low-temperature monoclinic (LTMP) then high-temperature (HTMP) when the treatment temperature increased 500 700 °C, respectively. With transformation, morphology...

Metal phosphates have been popularly regarded as excellent luminescence hosts of lanthanide ions, while such an issue is challenged by the ignorance about structural stability that may originate from different chemical nature between framework and dopant ions. Here, we choose BiPO4 a model compound to study. A detailed investigation effects Eu doping annealing on structures related properties Bi1–xPO4:Eux (x = 0–0.199) has carried out. monoclinic phase (denoted LTMP) was obtained for undoped...

The majority of electrode materials suffer from severe capacity fading on cycling at elevated temperatures or poor conductivity and diffusion Li+ low temperatures, which have made it very difficult for lithium-ion batteries to operate and/or without loss electrochemical performance. In this work, we report a new strategy tackling issue through low-concentration donor-doping higher valence Mn ions in LiCoO2, typical commercial cathode many batteries. Firstly, Mn-doped LiCoO2 was successfully...

Abstract The fundamental atomic-level properties of (a/2)(111) screw dislocations and other defects in bcc Ta have been simulated by means new quantum-based multi-ion interatomic potentials derived from the model generalized pseudopotential theory (MGPT). validated detail using a combination experimental data ab-initio electronic structure calculations on ideal shear strength, vacancy self-interstitial formation migration energies, grain-boundary atomic stacking-fault energy (γ) surfaces....

This work explores the size-induced lattice modification and its relevance to photoluminescence properties of tetragonal zircon-type GdVO4:Eu3+ nanostructures. nanoparticles with crystallite sizes ranging from 14.4 24.7 nm were synthesized by a hydrothermal method using sodium citrate as capping agent. Regardless reaction temperatures, all samples retained an ellipsoidal-like morphology. Nevertheless, size reduces, there appears tensile strain distortion, which is accompanied expansion...

In this work, preparation of cereal-like architectures Y V O(4) and O(4):Ln(3 + ) (Ln = Eu, Sm, Dy, Tb) was initiated using a hydrothermal method. During the formation reaction, Na(3)C(6)H(5)O(7).2H(2)O used to effectively adjust concentration Y(3 species necessary for architectures. Phase structure, surface chemistry, morphology, photoluminescence were characterized by x-ray powder diffraction, Fourier transformed infrared spectra, scanning electron microscopy, transmission spectra. All...

In this work, a novel solvent-driven room-temperature synthesis of BiPO(4):Eu(3+) nanoparticles was presented. By virtue 11 solvents with different properties and function groups, phase structure composition can be systematically tailored. Hexagonal (HP) obtained in water hydrophobic organic such as arenes cyclohexane, while low-temperature monoclinic (LTMP) prepared hydrophilic alcohols. other (i.e., ethers, aldehydes, ketones, carboxylic acids), mixture HP LTMP formed, which the relative...

Abstract This work reports on the kinetic control over crystallinity and defect chemistry of YVO 4 nanoparticles for optimization their photocatalytic performance. were prepared at room temperature via a precipitation method then annealed in air selected temperatures ≤ 500 °C to tune features. By systematic evaluation sample characterizations, it has been found that as‐prepared samples crystallized pure tetragonal zircon‐type structure, surfaces particles are hydrated. Upon annealing, all...

In this work, BiPO4/Eu of different polymorphs was prepared using a simple hydrothermal method. It is found that hexagonal phase (HP) formed at 100 °C, which transformed to low-temperature monoclinic (LTMP) when temperature increased 160 °C. This LTMP reversely HP the beyond 180 evolution quite distinct from those high-temperature calcinations (CrystEngComm, 2011, 13, 6251–6257). Accompanying evolution, sample morphology varied homogeneous rodlike shape prismlike shape, while lattice strain...

This work initiated a study on the preparation of assembled-spheres YVO4:(Ln3+, Bi3+) (Ln = Eu, Sm, Dy, Ho), in which Bi3+ co-doping lower content, aims to achieve emission tailored for many applications by supressing serious changes host structures when higher concentrations are involved. The formation is beneficial from simultaneous dissolution starting Bi and Ln salts with use ethylene glycol. As result, all featured low surface absorbents little interior lattice defects, decreased...

YVO4:Eu3+ of four different morphologies was successfully synthesized by simply varying the pH under hydrothermal conditions. Systematic characterization indicates that increasing from 3 to 14, morphology changed uniform hollow microspheres, potato-cakes, microhamburgers, lichee-like architectures in sequence, which is followed a colour variation wine, red-purple, pink-purple, red. Among all morphologies, shape showed superior luminescence performance as represented high quantum efficiency...

A facile strategy was initiated to fabricate large-scale uniform brookite TiO2 nanospindles preferentially grown along the [001] direction, which were highly thermally stable and exhibited superior electrical conductivity, about two orders of magnitude higher than those anatase rutile counterparts.

Metastable materials usually possess unique properties. How to acquire these properties is still a great challenge. In this work, we explored the electrical of metastable BiPO4 through switchable phase transitions. A monoclinic (denoted as HTMP) was synthesized by heat-treatment over hexagonal (HP). It found that there reversible transformation between HTMP and low-temperature (LTMP). Namely, gradually transformed LTMP simple hand-grinding or ball milling, while back upon heat treatment....

Chemically tailoring microstructures for an optimum red luminescence is a subject at the forefront of many disciplines, which still remains challenge due to poor knowledge about roles defects in structures. In this work, GdVO4 :Eu3+ nano/microstructures different morphologies, including tomato-like, cookie-circle-like, and ellipsoidal-like nanoparticles, microspheroids were synthesized via simple hydrothermal route using trisodium citrate as capping agent. During growth processes, types...

A series of single-crystalline Ln3+-doped YVO4 (Ln = Pr, Sm, Eu, Tb, Dy, Ho, Er) nanoparticles with mesoporous cell-like nanostructure were prepared via initiating homogeneous precipitation followed by a hydrothermal treatment. All synthetic samples showed slight variation crystallite size, ranging from 15 to 17 nm. TEM analysis demonstrated that the diameter internal structure is about 2∼10 The calculated unit cell volume linear increase trend increasing ionic radius doped Ln3+ ions. Under...

Metal oxide nanomaterials have been found to great potential for diverse applications due their unique relationships between structure and properties. Lattice expansion as particle size reduces was previously considered be general metal nanomaterials. It is now a challenge see if lattice contraction could induced by the effect ABO4 oxides (e.g., CaWO4, GdVO4, CdWO4) are some of most important functional materials with many applications, while such at nanoscale never reported show...

Well-defined Pd/ZnO nanocomposites prepared by modifying ZnO nanosheets with Pd nanoparticles exhibit excellent photocatalytic activity and good reusability for the removal of phenol from water.