Perturbed angular correlation spectroscopy of defects in Ceria by Ruiping Wang

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  • Cerium oxides.

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Statementby Ruiping Wang.
The Physical Object
Pagination125 leaves, bound :
Number of Pages125
ID Numbers
Open LibraryOL15188986M

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Perturbed angular-correlation spectroscopy of defects in ceria. Miscellaneous Wang, Ruiping. Dilute indium dopants in cerium oxides were studied by {sup }In/Cd Perturbed Angular Correlation (PAC) spectroscopy. Oxygen concentration in the cerium oxides was controlled through doping or high-temperature vacuum cleaning; four different defect.

Perturbed Angular Correlation Spectroscopy of Defects in Ceria - Perturbed angular correlation spectroscopy of defects in Ceria book Dilute indium dopants in cerium oxides have been studied by ^{}In/Cd Perturbed Angular Correlation (PAC) spectroscopy.

We control oxygen concentration in the cerium oxides through doping or high-temperature vacuum cleaning. We have found four different defect : Ruiping Wang. differential perturbed-angular-correlation (PAC) mea- surernents on cerium oxide in which the concentration of oxygen lattice defects is controlled by doping.

Atomistic simulation calculations have been used to investigate the energetics of defect clustering and migration in ceria. The defects considered are In 3+, Cd 2+, their associated oxygen vacancies, and small polarons modeled as Ce 3+ ions.

Thus a range of complex defect clusters is considered. The overall aim of the study is to generate a better understanding of these defects as they. Perturbed Angular Correlation Spectroscopy – A Tool for the Study of Defects and Diffusion at the Atomic Scale Article (PDF Available) in Defect and Diffusion Forum March with.

Perturbed angular correlation (PAC) spectroscopy of materials containing static defects must often deal with quadrupolar broadening due to randomly distributed defects. The electric field gradient. The perturbed angular correlation method. The technique of the perturbed angular correlation (PAC) belongs to the class of hyperfine spectroscopic methods as the Mößbauer-spectroscopy.

The hyperfine interaction between the electromagnetic moments of the nuclear state and the external electromagnetic fields at nuclear site is measured. For that purpose, perturbed angular correlation spectroscopy (PACS) is applied to low-temperature electron-irradiated Ge. The aim is to use a radioactive probe atom ( In) in the immediate vicinity of the intrinsic point defects.

Perturbed Angular Correlation Spectroscopy A Tool for the Study of Defects and Diffusion at th e Atomic Scale Matthew Zacate 1,a and Herbert Jaeger 2,b 1 Northern Kentucky University, Highland Heights, KYUSA 2 Miami University, Oxford, OHUSA a [email protected], b [email protected] Keywords: Perturbed angular correlation spectroscopy, TDPAC, point defects.

Several experimental methods based on radioactive probes have been used and combined to study vacancies and self-interstitials in Ge. Central to the studies is the perturbed angular correlation spectroscopy. Defects are created and detected by electron irradiation with subsequent trapping at In probe atoms and the neutrino-recoil technique.

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Impurity Centers in Oxides Investigated by g-g Perturbed Angular Correlation Spectroscopy and ab initio calculations Alberto F. Pasquevich a and Mario Rentería b. Departamento de Física and Instituto de Física La P lata (IFLP, CCT La Plata, CONICET), Facultad de Ciencias Exactas, Universidad Nacional de La Pl ata, CC 67, La Plata.

The Application ofHg NMR andmHg Perturbed Angular Correlation (PAC) Spectroscopy to Define the Biological Chemistry of HgII: A Case Study with Designed Two- and Three-Stranded Coiled Coils Olga Iranzo, Peter W. Thulstrup, Seung-baek Ryu, Lars Hemmingsen, Vincent L.

Pecoraro. Formation of buried CoSi2 layers by ion implantation, studied by Mössbauer spectroscopy and Rutherford backscattering spectroscopy (A. Vantomme et al.). Perturbed angular correlation spectroscopy of acceptor-donor pairs in silicon, germanium and GaAs (N.

Achtziger et al.). Perturbed angular correlation has been established in the past two decades as a powerful tool for the microscopic investigation of solid state properties.

It was originally developed and applied to the determination of magnetic dipole and electric quadrupole moments of excited nuclear states, a domain of nuclear physicists.

In this article, we give an elementary introduction to the theory and applications of perturbed angular correlation of γ-rays (PAC) spectroscopy. In most applications in bioinorganic and inorganic chemistry the nuclear quadrupole interaction (NQI) is measured, providing a spectroscopic fingerprint of the local electronic and molecular.

perturbation functions for static interactions in perturbed angular correlations of -y-rays. Hyperfine Interactions,(). Perturbed Angular Correlation Spectroscopy of Defects in Ceria. Phase transformations in reduced ceria:. Most state‐of‐the‐art first‐principle (or ab initio) calculations for defects and impurities in solid are based on density functional theory (DFT).

The most common dopant impurities for silicon and germanium are group‐III elements as p ‐type dopants and group‐V elements as n ‐type dopants. 2nd Edition Published on Febru by CRC Press Praise for the First Edition.

The crystal lattice of bulk grains and state-of-the-art films of indium nitride was investigated at the atomic scale with perturbed angular correlation spectroscopy using the In/Cd radioisotope probe. The probe was introduced during sample synthesis, by diffusion and by.

Plastic deformation during cold work produces dislocations, lattice deformations, and defects in Heusler alloys. We report here the occurrence of such effects in L 2 1 Heusler alloy Ni 2 MnGa and in Cl b Heusler PdMnSb.

Perturbed angular correlation (PAC) study of In‐ probe substituted at the Ga site in Ni 2 MnGa gives B=±1 kG, ΔB/B=±, and anisotropy A=± for a. Atomic defects which migrate and trap at impurity probe atoms can be labelled by the changes they induce in the hyperfine interactions of the probe nuclei.

Many studies have been made using perturbed γ−γ angular correlations (PAC) and theIn probe because of the excellent resolution of different sites. Identification of the bound states is the key problem in applying hyperfine.

The present review describes the methodology of perturbed angular correlation of gamma rays (PAC) applied to biological problems. A large part of the present review focuses on the application of PAC spectroscopy to the study of coordination geometry for the metal site in zinc enzymes.

Abstract Perturbed Angular Correlations (PAC) spectroscopy is an effective local probe technique often employed in the characterization of defects or phase transitions in any of a variety of materials.

The local structural environments of Y 3+ and Zr 4+ in 18 wt% Y 2 O 3 ‐stabilized zirconia were studied using extended X‐ray absorption fine structure spectroscopy over the temperature range –° to °C.

The measured cation‐oxygen distances reflect those of the parent oxides, with the mean Zr‐O distance nm shorter than the mean Y‐O distance. The time differential perturbed angular correlation (TDPAC) technique was used to study the temperature dependence of electric field gradient (EFG) in LaCoO 3 perovskite using and nuclear probes.

The radioactive parent nuclei In and Hf were introduced into the oxide lattice through a chemical process during sample preparation and were found to occupy only the Co sites in. PERTURBED ANGULAR CORRELATION GAMMA-GAMMA SPECTROSCOPY WITH Ce ISOTOPE IN CeMn2Ge2. Perturbed Angular Correlation Spectroscopy of Defects in Ceria 1.

Introduction Ceramics include a wide range of materials. They have been defined by the National Academy of Sciences' as "inorganic, nonmetallic, materials processed or consolidated at high temperatures".

Advanced or high technology ceramics are distinguished from more traditional. The results of the investigation of structural properties and defects of HfO2 nanoparticles and thin films are discussed in terms of the electric quadrupole interactions of the nuclear probe Ta within the sample volume measured by the perturbed angular correlation spectroscopy.

Perturbed angular correlations: supplemented by proceedings of the Uppsala Meeting on Extranuclear Perturbations in Angular Correlations, Mayby Karlsson, E.

Matthias, E. ; Siegbahn, Kai, ; Uppsala Meeting on Extranuclear Perturbations in Angular Correlations and a great selection of related books, art and collectibles available now at Excellent introduction to perturbed angular correlation and muon spin resonance and relaxation spectroscopies.

Applications of PAC in studies of magnetism, point defects, surfaces and hydrogen. Schatz and A. Weidinger, Nuclear Condensed Matter Physics: Nuclear Methods and Applications (John Wiley and Sons, ). Application of perturbed angular correlation spectroscopy in IgG immunoglobulins. Perturbed Angular Correlation Spectroscopy Perturbed Angular Correlation (PAC) spectroscopy is used to investigate the microscopic crystal lattice environment.

Information about phase change and transitions, defects and impurities- their production and lattice location, magnetism, etc. can be obtained. The technique involves the observation of. Get this from a library. Defects and diffusion studied using PAC spectroscopy: special topic volume with invited peer reviewed papers only.

[Herbert Jaeger; Matthew O Zacate;] -- "The current volume of Defect and Diffusion Forum is dedicated to the use of perturbed angular correlation spectroscopy (PAC) in the study of defects and diffusion at the atomic scale."--Preface. A perturbed angular correlation study of Cd ions in frozen aqueous solutions of InCl 3 and In(NO 3) 3 has demonstrated the variation in behavior of these systems with temperature from − to − 20°C.

At the lowest temperature a strong static quadrupole interaction (ω Q = × 10 7 rad / sec) was observed.

Above − 80°C, a time‐dependent perturbation was found, and the. Perturbed-angular-correlation spectroscopy: Structural anomalies in (Sr,Ca)(ZrHf)P6O24 ceramics. Perturbed Angular Correlation of Gamma Rays. Angular Correlation of Nuclear Radiation Crystal defects in diamond have emerged as unique objects for a variety of applications, both because they are very stable and because they have interesting optical properties.

Embedded in nanocrystals, they can serve, for example, as robust single. Mauk MR, Gamble RC. Stability of lipid vesicles in tissues of the mouse: a gamma-ray perturbed angular correlation study.

Proc Natl Acad Sci U S A. Feb; 76 (2)– [PMC free article] Hwang KJ, Mauk MR. Fate of lipid vesicles in vivo: a gamma-ray perturbed angular correlation study.

Proc Natl Acad Sci U S A. Nov; 74 (11) the ‘unperturbed’ angular correlations measured at room temperature. It in-cludes a review of the formalism, along with the results and a discussion of the measurements, which indicate the direction of the electric-field gradient in the gadolinium foils.

The perturbed angular correlation results are presented in section 6. Home» ANU Research» ANU Scholarly Output» ANU Research Publications» Perturbed Angular Correlation Spectroscopy of Implantation-Damaged Indium Nitride Perturbed Angular Correlation Spectroscopy of Implantation-Damaged Indium Nitride.

link to publisher version. Statistics. Book Description. Dopants and Defects in Semiconductors covers the theory, experimentation, and identification of impurities, dopants, and intrinsic defects in semiconductors.

The book fills a crucial gap between solid-state physics and more specialized course texts. Perturbed Angular Correlation Spectroscopy (PACS) Nuclear Reactions.The main focus of this research is to show, through the use of perturbed angular correlation spectroscopy (PAC), that a displacive phase change occurs in the mineral zirconium silicate, ZrSiO4, which is related to the purity of the sample.Perturbed Angular Correlation Spectroscopy (PACS) Nuclear Reactions --References --Chapter and intrinsic defects in semiconductors.

The book fills a crucial gap between solid-state physics and more specialized course texts. The authors first present introductory concepts, including basic semiconductor theory, defect.

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