Materials Literature
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Triply doped Y3Al5O12: Ce3+, Pr3+, Cr3+ phosphors are prepared by solid state reaction. The emission spectra are enriched in the red region with the luminescence of both Pr3+ and Cr3+ through Ce3+ → Cr3+ and Ce3+ → Pr3+ → Cr3+ energy transfers. The properties of photoluminescence and fluorescence decay indicates large…
We investigate the growth of dynamic heterogeneity in a glassy hard-sphere mixture for volume fractions up to and including the mode-coupling transition. We use an 80 000 particle system to test a new procedure to evaluate a dynamic correlation length $\ensuremath{\xi}(t)$: we determine the ensemble independent dynami…
{[3,5-(CF(3))(2)Pz]Ag}(3) (1) films exhibit selective/reversible sensing of small-organic-molecule (SAM) vapors, which readily switch-on bright-green (benzene or toluene) or bright-blue (mesitylene) luminescence that switches-off upon vapor removal. Vapors of electron-deficient SAMs or non-aromatic solvents did not at…
Abstract The reactions of titanium alkoxides with a large excess of different carboxylic acids under nonhydrolytic conditions leads to the reproducible formation of well‐defined nano‐building units (NBUs) with the formula [Ti 8 O 8 (OOCR) 16 ] [R = C 6 H 5 , C(CH 3 ) 3 , CH 3 ]. The structures of these titanium–oxo–ca…
Synthesis of nanomaterials with multi-imaging modality is of great importance in clinical molecular imaging and diagnostics. This work reports novel synthetic strategy to create ultrasmall and hexagonal upconversion nanoparticles (UCNPs), β-NaGdF 4: Yb 3+, Er 3+, and β-NaGdF 4: Yb 3+, Tm 3+, with inherent magnetic and…
Single crystals of electron-doped ${\text{SrMnO}}_{3}$ with a cubic perovskite structure have been systematically investigated as the most canonical (orbital-degenerate) double-exchange system, whose ground states have been still theoretically controversial. With only $1--2\text{ }\mathrm{%}$ electron doping by Ce sub…
The $k$-space polarization structure and its strain response in ${\text{SrTiO}}_{3}$ with rotational instability are studied using a combination of first-principles density-functional calculations, modern theory of polarization, and analytic Wannier-function formulation. (1) As one outcome of this paper, we rigorously…
Physical properties of chalcogenide glasses in the ${\text{As}}_{x}{\text{Se}}_{1\ensuremath{-}x}$ system have been measured as a function of composition including the Young's modulus $E$, shear modulus $G$, bulk modulus $K$, Poisson's ratio $\ensuremath{\nu}$, the density $\ensuremath{\rho}$, and the glass transition…
In this paper we consider a simplified two-dimensional scalar model for the formation of mesoscopic domain patterns in martensitic shape-memory alloys at the interface between a region occupied by the parent (austenite) phase and a region occupied by the product (martensite) phase, which can occur in two variants (twi…
Ab-initio, self-consistent electronic energy bands of zinc blende CdS are reported within the local density functional approximation (LDA). Our first principle, non-relativistic and ground state calculations employed a local density potential and the linear combination of atomic orbitals (LCAO). Within the framework o…
A complete table of (3 + 1)D, (3 + 2)D and (3 + 3)D superspace groups (SSGs) has been enumerated that corrects omissions and duplicate entries in previous tables of superspace groups and Bravais classes. The theoretical methods employed are not new, though the implementation is both novel and robust. The paper also de…
A general reaction mechanism describes the qualitative change in chemical topology along the reaction pathway. On the basis of this principle, we present a method to characterize intramolecular substituent permutation in pentavalent compounds. A full description of the geometry around five-coordinate atoms using inter…
We evaluate the performances of ab initio GW calculations for the ionization energies and HOMO-LUMO gaps of thirteen gas phase molecules of interest for organic electronic and photovoltaic applications, including the C60 fullerene, pentacene, free-base porphyrins and phtalocyanine, PTCDA, and standard monomers such as…
The Raman $2D$ band---important for the analysis of graphene---shows a splitting for uniaxial strain. The splitting depends on the strength and direction of the applied strain and on the polarization of the incident and outgoing light. We expand the double-resonance Raman model in order to explain the strain direction…
The normal spinel oxide MgCr2O4 is cubic at room temperature while the normal spinel CuCr2O4 is tetragonal as a consequence of the Jahn-Teller nature of Cu2+ on the tetrahedral sites. Despite different end-member structures, complete solid solutions of Mg_{1-x}Cu_xCr2O4 can be prepared that display a first-order struc…
The magnetic and multiferroic phase diagram of ${\text{Mn}}_{0.85}{\text{Co}}_{0.15}{\text{WO}}_{4}$ single crystals is investigated by means of magnetic, heat-capacity, dielectric, polarization, and neutron-scattering experiments. Three magnetic phase transitions are detected through distinct anomalies in all physica…
The ability to protect refined metals from reactive environments is vital to many industrial and academic applications. Current solutions, however, typically introduce several negative effects, including increased thickness and changes in the metal physical properties. In this paper, we demonstrate for the first time…
Using a full dispersion description of phonons, the thermal conductivities of bulk Si and Bi2Te3 are evaluated using a Landauer approach and related to the conventional approach based on the Boltzmann transport equation. A procedure to extract a well-defined average phonon mean-free-path from the measured thermal cond…
We propose a method for nano-scale characterization of long range magnetic order in diluted magnetic systems to clarify the origins of the room temperature ferromagnetism. The GaN:Mn thin films are grown by metal-organic chemical vapor deposition with the concentration of Ga-substitutional Mn up to 3.8%. Atomic force…
IMPORTANCE OF THE FIELD: The review presents the design strategy and synthesis of multifunctional dendrimers and hyperbranched polymers with the objective to develop effective drug delivery systems. AREAS COVERED IN THIS REVIEW: Well-characterized, commercially available dendritic polymers were subjected to functional…