Materials Literature
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We employed transmission electron microscopy and Raman spectra to investigate the behavior of impurity carbon usually unintentionally introduced in N-doped ZnO by metal-organic chemical vapor deposition. Unintentional doped carbon may form graphite clusters along grain boundaries resulting in n-type domains and possib…
Abstract The new cis ‐dioxomolybdenum(VI) complexes [MoO 2 (salhyhb)] 2 ( 1 ), [MoO 2 (salhyhp)] ( 2 ), and [MoO 2 (salhyhh)(MeOH)] ( 3 ) with the hydrazone ligands H 2 salhyhb, Hsalhyhp, and H 2 salhyhh derived from salicylaldehyde and ω‐hydroxy carbonic acid hydrazides with different chain lengths, have been synthes…
The brownmillerite-type A 2B 2O 5 structure is considered as a parent one, giving rise to different derivatives: layered double perovskites, A-site and anion-vacancy-ordered perovskites, and the perovskite-like compounds with crystallographic shear planes. The structural relationships and synthesis pathways for these…
Face-centered cubic (fcc) Supra-crystals and disordered assemblies of Co nanocrystals have their time-dependent reflectivity compared using time-resolved confocal microscopy. The differential reflectivity exhibits a behavior strongly dependent on mesoscopic organization, an effect associated with the collective cohere…
The partitioning of iron among octahedrally coordinated sites in tourmaline, and its stereochemical consequences, were investigated in a Fe-rich dravite in a skarn rock from Utö, Sweden. A multianalytical approach using structure refinement (SREF), electron microprobe analysis (EMPA), and Mössbauer spectroscopy (MS) e…
The growth of Sb-doped p-type ZnO∕Ga-doped n-type ZnO homojunction on Si (100) substrate by molecular beam epitaxy led to closely packed vertical ZnO columns with lateral diameters ranging from 100to400nm. Mesa structures were defined and Ohmic contact of both n-type ZnO and p-type ZnO was realized with Au∕Ti and Au∕N…
This paper is concerned with the development of a high-precision 30-kW (40-hp) calorimeter and is specifically focused on how experimental errors resulting from calorimeter design and operating procedures are eliminated or mitigated. A complete calibration for the calorimetric system using a DC heater is conducted, an…
Abstract Amplified spontaneous emission (ASE) of a series of blue‐emitting poly(ladder‐type phenylene)s (LPPP)s has been studied in thin film polymer waveguide structures. The chemically well‐defined step‐ladder polymers consist of an increasing number of bridged phenylene rings per monomer unit starting from fully ar…
Reduce, reuse, recycle: A new methodology allows the synthesis of ordered mesoporous materials in water at room temperature, eliminating the need for organic solvents and reducing the amount of energy consumed. It relies on the reversible formation of micelles of water-soluble block copolymers as structure-directing a…
Zinc oxide (ZnO)-based optoelectronics has emerged as a frontier area in semiconductor research in recent years. In the design of ZnO-based optoelectronic devices, cation-substituted ZnO serves as essential components for the desired device functions. Band-gap engineering by cation substitution enables the facile prep…
Photoluminescence excitation spectroscopy was employed to investigate the electronic structure of ZnSe/ZnS core/shell quantum dots. Four excited states viz. $1{S}^{e}\ensuremath{-}1{S}_{3/2}^{h}$, $1{S}^{e}\ensuremath{-}2{S}_{3/2}^{h}$, $1{P}^{e}\ensuremath{-}1{P}_{3/2}^{h}$, and $1{S}^{e}\ensuremath{-}1{S}^{SO}$ are…
By decorating the surfaces of smooth, flat platelets with hemispheroidal asperities and calculating the overlapping excluded volume of spherical depletion agents as two platelets approach face to face, we determine the depletion interaction potential for both ordered and disordered surface asperities. Depending on the…
The effect of Al donor and O vacancy (VO) on the magnetic properties of Co-doped ZnO has been studied by first-principles calculations. It is found that only Al donor cannot induce ferromagnetism (FM) in Co-doped ZnO but can provide additional electrons, which results in the enhancement of Fermi level. The presence of…
Spatial coexistence of ferroelectric and magnetic domains in micrometer scale is confirmed by multimode scanning probe microscopy of pulsed laser deposited Bi0.7Dy0.3FeO3 thin films. The observed change in ferroelectric polarization with applied magnetic field proves the coupling between magnetic and ferroelectric ord…
A material consisting of multi-walled carbon nanotubes (MWCNTs) and larger titania (TiO(2)) nanotube arrays has been produced and found to be efficient for reversible hydrogen (H(2)) storage. The TiO(2) nanotube arrays (diameter ∼60 nm and length ∼2-3 µm) are grown on a Ti substrate, and MWCNTs a few µm in length and…
The use of second-order Jahn-Teller active Mo (VI) centers and chiral organic amines is discussed as an approach to crystallographic noncentrosymmetry. Several series of reactions, conducted under mild hydrothermal conditions, were designed to probe important reaction variables. Correlations between reagent and solven…
Thin lamellae were cut from bulk single crystal BaTiO3 using a focused ion beam microscope. They were then removed and transferred onto single crystal MgO substrates, so that their functional properties could be measured independent of the original host bulk ferroelectric. The temperature dependence of the capacitance…
Mn-doped CdS nanorods synthesized by solution phase chemistry demonstrate robust ferromagnetic properties at and above room temperature. The nanorods show large coercivity, possibly originating from the shape anisotropy. The hysteresis measurements reveal strong temperature dependence. Possible origin of the ferromagn…
In situ, high-temperature Raman spectroscopy was used to study the Q n speciation in binary Nasilicate glasses and melts. Over 300 Raman spectra in the compositional range from 25 to 40 mol% Na 2 O were collected at room and high temperatures between 800 and 1200 K. Quantitative information on the relative abundances…
The synthesis, crystal structures, second-harmonic generation (SHG), piezoelectric, pyroelectric, and ferroelectric properties of three polar noncentrosymmetric (NCS) hexagonal tungsten bronze-type oxides are reported. The materials KNbW 2O 9, RbNbW 2O 9, and KTaW 2O 9 were synthesized by standard solid-state techniqu…