There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

비만아 부모의 돌봄 경험: q 방법론

Giant and isotropic magnetoresistance as huge as −53% was observed in magnetic manganese oxide La0.72Ca0.25MnOz films with an intrinsic antiferromagnetic spin structure. We ascribe this magnetoresistance to spin‐dependent electron scattering due to spin canting of the manganese oxide.

31p-S-4 Giant Magnetoresistance in Magnetic Manganese Oxide with Intrinsic Antiferromagnetic Spin Structure

Nanomaterials (NMs) are gaining significance in technological applications due to their tunable chemical, physical, and mechanical properties and enhanced performance when compared with their bulkier counterparts. This review presents a summary of the general types of NMs and provides an overview of the various synthesis methods of nanoparticles (NPs) and their functionalization via covalent or noncovalent interactions using different methods. It highlights the techniques used for the characterization of NPs and discusses their physical and chemical properties. Due to their unique properties, NMs have several applications and have become part of our daily lives. As a result, nanotoxicity research is gaining attention since some NPs are not easily degraded by the environment. Thus, this review also highlights research efforts into the fate, behavior, and toxicity of different classes of NMs in the environment.

Nanomaterials: Classification, properties, and environmental toxicities

Nanophasic BiFe0.95Co0.05O3 (BFCO) particles were synthesized using low cost, easy, simple, environment friendly and low temperature acetate precursor based modified sol–gel method. Influence of particle size and magnetic field on the structural, dielectric, impedance and a.c. conductivity of BFCO is investigated. X-ray diffraction (XRD) measurement has been performed to understand the structural modifications in the samples upon increasing the sintering temperature. Crystallite size (CS) increases from 33.62nm to 39.56nm due to agglomeration effect between the smaller crystallites. Effect of sintering temperature on the dielectric, impedance and conductivity has been studied and understood in the context of the creation of crystallite (particle) size and oxygen vacancies created due to high temperature sintering process. Magnetic field induced modifications in all these electrical properties [magnetoelectric (ME) effects] for the presently studied BFCO samples have been discussed on the basis of magnetos...

Investigations of magnetoelectric behavior in BiFe0.95Co0.05O3 nanoparticles

Present technical paper investigates the humidity sensing properties of Fe doped SnO2 nanocoral (FSNC)-like structures which were achieved by hydrothermal synthesis. The structural properties of FSNC samples were characterized using field emission scanning electron microscopy (Hitachi S–4800), energy-dispersive x-ray spectroscopy and x-ray diffraction (Rigaku Miniflex). FSNC with rod-, spherical-, and rod-shaped tentacles have been achieved using autoclave reactors of size 100 ml, 250 ml and 500 ml, respectively. The average crystallite size of FSNC with rod-, spherical-, and rod-shaped tentacles have been found to be ~ 6.51 nm, 7.26 nm and 4.93 nm, respectively. The sensing properties of the FSNC sensors have been established in a humidity chamber for a range of 20–80% relative humidity. The response/recovery time of sensors for FSNC with rod-, spherical-, and rod-shaped tentacles have been found to be 18/32 s, 25/40 s, and 20/30 s, respectively. The highest sensitivity has been achieved for FSNC with rod-shaped tentacles. The humidity sensing properties of FSNC sensors, such as response/recovery time, stability, hysteresis, and sensitivity have been investigated in detail.

Humidity Sensing Properties of Hierarchical Fe Doped SnO2 Nanocoral-Like Structures

Thermionic emission assisted charge conduction mechanisms across LaMnO3 / La0.7Ca0.3MnO3 interface of manganite thin film structure

Hybrid nanostructured Metal Oxide Semiconductor (MOS) capacitor was fabricated on silicon substrates (n-type) using chemical solution deposition with YMnO3 as an oxide layer. Electrical properties of MOS capacitor have been investigated with frequency dependence capacitance-voltage (C-V) characterization. The surface morphology of deposited layer was studied using the Atomic Force Microscopy (AFM). Hysteresis in the C-V loop and change in the values of Cminimum were described by a charge trap mechanism in the multiferroic oxide layer of MOS devices. While anomalous behavior in saturation capacitance in the inversion as well as in accumulation region and a shift in threshold voltage (VT) were explained in the vicinity of frequency depended Debye length (LDebye).

Charge Trap Mechanism in Hybrid Nanostructured (YMnO3) Metal-Oxide-Semiconductor (MOS) Devices

In this communication, we report the results of the studies on structural and transport properties of La1-xKxMnO3 (LKMO: 0.0 ≤ x ≤ 0.3) manganites synthesized by conventional solid state reaction method. Structural investigations on all the samples have been carried out by performing XRD measurement and Rietveld refinements of the raw data. All the samples show metal to insulator (semiconducting) transition at TP. Charge transport in semiconducting region of all the samples has been discussed by fitting various theoretical mechanisms and models to the resistivity data. Mott type VRH model has been found to be appropriate mechanism to understand the charge transport and related calculated activation energy (E) has been discussed in the light of carrier localization length. Variation in E with x has been explained on the basis of zener double exchange (ZDE) mechanism and possible Mn4+ − O2− − Mn4+ AFM type interaction in the system.

Nikesh A. Shah

Papers

Investigations of magnetoelectric behavior in BiFe0.95Co0.05O3 nanoparticles

Humidity Sensing Properties of Hierarchical Fe Doped SnO2 Nanocoral-Like Structures

Thermionic emission assisted charge conduction mechanisms across LaMnO3 / La0.7Ca0.3MnO3 interface of manganite thin film structure

Charge Trap Mechanism in Hybrid Nanostructured (YMnO3) Metal-Oxide-Semiconductor (MOS) Devices

K-substitution induced electrical band gap engineering in La1-xKxMnO3 manganites