Güncel Gönderiler: Fizik Bölümü
Toplam kayıt 230, listelenen: 61-80
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DX-center energy calculation with quantitative mobility spectrum analysis in n-AlGaAs/GaAs structures with low Al content
(ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2009)Experimental Hall data that were carried out as a function of temperature (60-350 K) and magnetic field (0-1.4 T) were presented for Si-doped low Al content (x = 0.14) n-Al(x)Ga(1-x)As/GaAs heterostructures that were grown ... -
Pressure-induced phase transition in AIN: An ab initio molecular dynamics study
(ELSEVIER SCIENCE SA, 2009)An ab initio constant pressure technique is applied to study the pressure-induced phase transition in AIN. A first-order phase transformation from the wurtzite structure to a rocksalt structure is observed in the constant ... -
Theoretical and experimental study on metal(II) halide complexes of 1,3-bis(4-pyridyl)propane
(SPRINGER, 2009)We report the results of detailed experimental and theoretical studies on the molecular structure and vibrational spectra of metal(II) halide complexes of 1,3-bis(4-pyridyl)propane [M(N2C13H14)X-2, where M represents Zn ... -
Structural, electrical and optical characterization of InGaN layers grown by MOVPE
(IOP PUBLISHING LTD, 2009)We present a study on n-type ternary InGaN layers grown by atmospheric pressure metalorganic vapour phase epitaxy (MOVPE) on GaN template/(0001) sapphire substrate. An investigation of the different growth conditions on ... -
Pressure-induced phase transformation of 4H-SiC: An ab initio constant-pressure study
(EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2009)The stability of 4H-SiC at high pressure is studied using a constant-pressure ab initio technique. For the first time, a first-order phase transformation into a rocksalt structure is observed in this material. The 4H-to-RS ... -
The effect of intrinsic defects on the hole transport in Cu2O
(NATL INST OPTOELECTRONICS, 2009)Structural and electrical properties of Cu2O bulk samples are characterized by X-Ray diffraction (XRD) and Hall effect measurements. The variation of the carrier concentration with temperature is explained in terms of the ... -
DFT, FT-Raman, FT-IR and NMR studies of 2-fluorophenylboronic acid
(WILEY-BLACKWELL, 2009)The experimental and theoretical vibrational spectra of 2-fluorophenylboronic acid (2fpba) were studied. The Fourier transform Raman and Fourier transform infrared spectra of the 2fpba molecule were recorded in the solid ... -
Analysis of vibrational spectra of 2 and 3-methylpiperidine based on density functional theory calculations
(PERGAMON-ELSEVIER SCIENCE LTD, 2009)The experimental and theoretical vibrational spectra of 2 and 3-methylpiperidine (abbreviated as 2-MP and 3-MP) were studied. The FT-Infrared spectra of 2-MP and 3-MP molecules were recorded in the liquid phase. The ... -
Crossover from Nearest-Neighbor Hopping Conduction to Efros-Shklovskii Variable-Range Hopping Conduction in Hydrogenated Amorphous Silicon Films
(JAPAN SOC APPLIED PHYSICS, 2009)We presented the results of optical and electrical studies of the properties of hydrogenated amorphous silicon (a-Si H) film which was prepared by hot wire method. Using transmittance measurements, the dielectric constant ... -
New transformation mechanism for a zinc-blende to rocksalt phase transformation in MgS
(IOP PUBLISHING LTD, 2009)The stability of the zinc-blende structured MgS is studied using a constant pressure ab initio molecular dynamics technique. A phase transition into a rocksalt structure is observed through the simulation. The zinc-blende ... -
Electrical conduction properties of Si delta-doped GaAs grown by MBE
(ELSEVIER SCIENCE BV, 2009)The temperature dependent Hall effect and resistivity measurements of Si delta-doped GaAs are performed in a temperature range of 25-300 K. The temperature dependence of carrier concentration shows a characteristic minimum ... -
Molecular structure and vibrational assignments of hippuric acid: A detailed density functional theoretical study
(PERGAMON-ELSEVIER SCIENCE LTD, 2009)In this study, the structural properties of hippuric acid (C(9)H(9)NO(3), HA) were studied using density functional theory (DFT) employing B3LYP exchange correlation. The geometry of the molecule was fully optimized at ... -
FT-IR, FT-Raman, ab initio and DFT structural and vibrational frequency analysis of 6-aminopenicillanic acid
(PERGAMON-ELSEVIER SCIENCE LTD, 2010)Quantum mechanical calculations of energies, geometries and vibrational wavenumbers of 6-aminopenicillanic acid were carried Out by using ab initio HF and density functional theory (DFT/B3LYP) methods with 6-311 G(d,p) ... -
Expanded phase of ZrO2: An ab initio constant-pressure study
(EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2009)The stability of ZrO2 in the tensile regime is studied using an ab initio constant-pressure technique. A first-order phase transformation from the baddeleyite structure to an anatase-like structure (I4(1)/amd) is predicted ... -
Experimental vibrational spectra (Raman, infrared) and DFT calculations on monomeric and dimeric structures of 2-and 6-bromonicotinic acid
(JOHN WILEY & SONS LTD, 2010)In this work, the Fourier transform infrared and Raman spectra of 2-bromonicotinic acid and 6-bromonicotinic acid (abbreviated as 2-BrNA and 6-BrNA, C(6)H(4)BrNO(2)) have been recorded in the region 4000-400 and 3500-50 ... -
Contributions of impurity band and electron-electron interactions to magnetoconductance in AlGaN
(TAYLOR & FRANCIS LTD, 2010)Low temperature electrical measurements of conductivity, the Hall effect and magnetoconductance were performed on a degenerate AlGaN sample. The sample exhibited negative magnetoconductance at low magnetic fields and low ... -
Molecular structure, vibrational spectroscopic, first-order hyperpolarizability and HOMO, LUMO studies of 3-hydroxy-2-naphthoic acid hydrazide
(WILEY, 2010)The Fourier-transform infrared spectrum of 3-hydroxy-2-naphthoic acid hydrazide (3H2NAH) was recorded in the region 4000-400 cm(-1). The Fourier-transform Raman spectrum of 3H2NAH was also recorded in the region 3500-10 ... -
Well parameters of two-dimensional electron gas in Al0.88In0.12N/AlN/GaN/AlN heterostructures grown by MOCVD
(WILEY-BLACKWELL, 2010)Resistivity and Hall effect measurements were carried out as a function of magnetic field (0-1.5 T) and temperature (30-300 K) for Al0.88In0.12N/AlN/GaN/AlN heterostructurcs grown by Metal Organic Chemical Vapor Deposition ... -
A study on the long term periodicities among the X-ray binaries: Two new superorbital periods
(WILEY-V C H VERLAG GMBH, 2010)Long term behaviours of a few selected X-ray binaries are studied on the basis of RXTE/ASM archive covering a period of similar to 13 years of continuous X-ray data. Two new superorbital periods seem to be revealed for the ... -
Pressure-induced phase transformation of BaS: An ab initio constant pressure study
(ELSEVIER SCIENCE BV, 2010)We present an ab initio molecular dynamics study of pressure-induced structural phase transition in BaS. We successfully observe the NaCl-to-CsCl phase transformation through the simulations. We also determine the ...
