Materials Literature
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In this paper we reported, to the best of our knowledge, the first deposition of highly oriented thin films (with thickness of about 90 nm) of NdCoO3 and Nd0.8Sr0.2CoO3 cobaltites on single-crystalline STO and LAO substrates. Our investigation has shown that highly oriented single phase thin films of NCO and NSCO can…
We propose how to control the THz radiation generated by fast moving Josephson vortices in spatially modulated (either along the c-axis or the ab-plane) samples of Bi-2212 and related superconducting compounds. We show that the JVs moving in a subset of weaker junctions can generate out-of-ab-plane and outside-the-con…
Sol–gel switching is triggered by counteranion guest exchange. The secondary structures of reversible coordination polymers can interconvert from a folded helical conformation (gel) into an unfolded zigzag conformation (sol) and back again in aqueous media (see picture).
Traditionally, SWNTs have been prepared by electric arc-discharge, laser ablation, or chemical vapor deposition (CVD) methods, yielding tubes of various diameter and length distributions. However, without exception, as-prepared SWNTs are contaminated with a number of impurities, decreasing the overall yield of usable…
Upon decreasing temperature or increasing pressure, a noncrystallizing liquid will vitrify; that is, the structural relaxation time, taualpha, becomes so long that the system cannot attain an equilibrium configuration in the available time. Theories, including the well-known free volume and configurational entropy mod…
We explore two routes to wave function engineering in elongated colloidal CdSe/CdS quantum dots, providing deep insight into the intrinsic physics of these low-dimensional heterostructures. Varying the aspect ratio of the nanoparticle allows control over the electron-hole overlap (radiative rate), and external electri…
Summary form only given. The complete presentation was not made available for publication as part of the conference proceedings.
Abstract The reaction of arsenic, arsenic trichloride and AlCl 3 with sulfur or selenium, respectively, in closed glass ampoules at 80 °C leads to melts from which on slow cooling to 50 °C (As 3 S 5 )[AlCl 4 ] and (As 3 Se 4 )[AlCl 4 ] can be obtained in the form of yellow and red crystals. The crystal structures ((As…
Abstract An unprecedented one‐dimensional chainlike compound with green fluorescent emission, (H 3 O)[Ag 3 (2,2′‐bpy) 2 (phnz) 2 (β‐Mo 8 O 26 )] (bpy = bipyridine, phnz = phenazine) has been synthesized under hydrothermal conditions. The compound is constructed from β‐octamolybdate clusters linked through two kinds of…
A thorough investigation of the relaxational dynamics in the recently discovered multiferroic $\mathrm{Cd}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ showing a colossal magnetocapacitive effect has been performed. Broadband dielectric measurements without and with external magnetic fields up to $10\phantom{\rule{0.3em}{0ex}}\m…
Abstract A new iron(II) orthophosphate K[Fe(PO 4 )] has been obtained by hydrothermal synthesis and its crystal structure was determined by single‐crystal X‐ray diffraction: space group P 2 1 / n , Z = 8, a = 9.6199(10), b = 8.6756(8), c = 10.8996(13) Å, β = 115.577(8)° at 193 K, R = 0.023. Fe II shows coordination nu…
Compositional variations across ferroelectric bilayers result in broken spatial inversion symmetry that can lead to asymmetric thermodynamic potentials. For the case of insulating materials, ferroelectric multilayers will self-pole due to the electrostatic coupling between the layers. Polarization-graded ferroelectric…
Abstract About Lanthanide Oxotantalates with the Formula MTaO 4 (M = La – Nd, Sm – Lu) Besides being a by‐product of solid state syntheses in tantalum ampoules the lanthanide(III) oxotantalates of the formula MTaO 4 can be easily prepared by sintering lanthanide sesquioxide M 2 O 3 and tantalum(V) oxide Ta 2 O 5 with…
Deformational behavior in freely suspended polymer nanomembranes with embedded carbon nanotubes has been investigated by in-situ monitoring of resonance Raman scattering (see Figure). A two-stage deformational process, with bending and buckling of the nanotubes at low deflections followed by along-axis stretching at h…
We have performed the high-field magnetization measurements on the spin-crossover complex $[{\mathrm{Mn}}^{III}(\mathrm{taa})]$ $({\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\text{\ensuremath{-}}(2\text{\ensuremath{-}}\mathrm{azolyl})\text{\ensuremath{-}}2\text{\ensuremath{-}}\mathrm{azabuten}\text{\ensuremath{-}}4\te…
Thin films of Zn1−xCoxO (x=1–15%) were grown on an Al2O3 (0001) substrate by pulsed laser deposition and characterized by investigating their photoluminescence (PL) and other optical properties. The films were highly (0001) oriented without any impurity phases as observed in x-ray diffraction. The optical transmittanc…
Although the mechanical behavior of carbon nanotubes has been studied extensively in recent years, very few experimental results exist on the shell buckling of nanotubes, despite its fundamental importance in nanotube mechanics and applications. Here we report an experimental technique in which individual multiwalled…
A theoretical model that predicts very strong magnetoelectric (ME) interactions at magnetoacoustic resonance (MAR) in single-crystal ferrite-piezoelectric bilayer is discussed. In such bilayers, the ME interactions are mediated by mechanical strain. We considered ME coupling at the coincidence of electromechanical res…
Abstract We report a novel hierarchically organized superstructure emerging from an exquisite association of inorganic crystals, organic polymers, and dyes. The resultant K 2 SO 4 /poly(acrylic acid) composite includes five different tiers from the nanoscopic to the macroscopic. An additional new tier leading to funct…
Protein design studies using coiled coils have illustrated the potential of engineering simple peptides to self-associate into polymers and networks. Although basic aspects of self-assembly in protein systems have been demonstrated, it remains a major challenge to create materials whose large-scale structures are well…