« Previous
1
Next »
(31 hits, 1/1)
Showing
10, 25, 50, 100, 500, 1000, all papers per page.
Sort by:
last publication date,
older publication date,
last update date.
- 1. Phys. Rev. B 75, 195215 (2007) , “Effect of Co and O defects on the magnetism in Co-doped ZnO: Experiment and theory”, G. S. Chang, E. Z. Kurmaev, D. W. Boukhvalov, L. D. Finkelstein, S. Colis, T. M. Pedersen, A. Moewes, and A. DiniaThe electronic structure of Zn1−xCoxO (x=0.02, 0.06, and 0.10) diluted magnetic semiconductors is investigated using soft x-ray emission spectroscopy and first-principles calculations. X-ray absorption and emission measurements reveal that most Co... (Read more)
- 2. Phys. Rev. B 75, 144404 (2007) , “Ferromagnetism in Fe-doped ZnO nanocrystals: Experiment and theory”, Debjani Karmakar, S. K. Mandal, R. M. Kadam, P. L. Paulose, A. K. Rajarajan, T. K. Nath, A. K. Das, I. Dasgupta, and G. P. DasFe-doped ZnO nanocrystals are successfully synthesized and structurally characterized by using x-ray diffraction and transmission electron microscopy. Magnetization measurements on the same system reveal a ferromagnetic to paramagnetic transition temperature above 450 K with a low-temperature... (Read more)
- 3. Phys. Rev. Lett. 98, 045501 (2007) , “Dopability, Intrinsic Conductivity, and Nonstoichiometry of Transparent Conducting Oxides”, Stephan Lany and Alex ZungerExisting defect models for In2O3 and ZnO are inconclusive about the origin of conductivity, nonstoichiometry, and coloration. We apply systematic corrections to first-principles calculated formation energies ΔH, and validate our theoretical defect model against... (Read more)
- 4. Appl. Phys. Lett. 89, 262112 (2006) , “Identification of oxygen and zinc vacancy optical signals in ZnO”, T. Moe Børseth, B. G. Svensson, A. Yu. Kuznetsov, P. Klason, Q. X. Zhao, and M. WillanderPhotoluminescence spectroscopy has been used to study single crystalline ZnO samples systematically annealed in inert, Zn-rich and O-rich atmospheres. A striking correlation is observed between the choice of annealing ambient and the position of the deep band emission (DBE) often detected in ZnO. In... (Read more)
- 5. Appl. Phys. Lett. 88, 242508 (2006) , “Thermal limits on field alignment of nanoparticle FePt media”, J. A. Bain, W. F. Egelhoff, Jr.We derive a simple expression for the average angular orientation distribution of ferromagnetic FePt particles in an applied field in thermal equilibrium. This system is closely related to the Langevin expression for paramagnetic susceptibility, which computes the average orientation of particles in... (Read more)
- 6. Phys. Rev. B 74, 165203 (2006) , “Isotopic-mass dependence of the A, B, and C excitonic band gaps in ZnO at low temperatures”, S. Tsoi, X. Lu, A. K. Ramdas, H. Alawadhi, M. Grimsditch, M. Cardona, and R. LauckLow temperature wavelength-modulated reflectivity measurements of isotopically engineered ZnO samples have yielded the dependence of their A, B, and C excitonic band gaps on the isotopic masses of Zn and O. The observed dependence is analyzed in terms of the band gap renormalization by zero-point... (Read more)
- 7. Phys. Rev. B 74, 144432 (2006) , “Role of defects in ferromagnetism in Zn1−xCoxO: A hybrid density-functional study”, C. H. PattersonExperimental studies of Zn1−xCoxO as thin films or nanocrystals have found ferromagnetism and Curie temperatures above room temperature and that p- or n-type doping of Zn1−xCoxO can change its magnetic... (Read more)
- 8. Phys. Rev. B 73, 235209 (2006) , “Temperature dependence of the vibrational spectrum of a Li-OH complex in ZnO: Infrared absorption experiments and theory”, Kevin R. Martin, Philip Blaney, Gang Shi, Michael Stavola, and W. Beall FowlerConsiderable interest has developed in the potential use of IIVI oxides as electronic and optical materials. In several cases, alkali atoms have been suggested as dopants. We report on the theoretical and experimental investigation of infrared and vibrational properties of a Li-OH complex in... (Read more)
- 9. Phys. Rev. B 73, 115207 (2006) , “First-principles study of migration mechanisms and diffusion of oxygen in zinc oxide”, Paul Erhart and Karsten AlbeWe have performed density-functional theory calculations in conjunction with the climbing image nudged elastic band method in order to study the self-diffusion of oxygen in zinc oxide. To this end, we have derived the complete set of migration paths for vacancies as well as interstitials in wurtzite... (Read more)
- 10. Appl. Phys. Lett. 87, 211912 (2005) , “Deep-level emissions influenced by O and Zn implantations in ZnO”, Q. X. Zhao, P. Klason, M. Willander, H. M. Zhong, W. Lu, J. H. YangA set of bulk ZnO samples implanted with O and Zn at various densities were investigated by photoluminescence. The implantation concentration of O and Zn is varied between 1×1017/cm3 and 5×1019/cm3. The samples were thermally treated in an... (Read more)
- 11. Appl. Phys. Lett. 87, 172108 (2005) , “Production of native donors in ZnO by annealing at high temperature in Zn vapor”, L. E. Halliburton, N. C. Giles, N. Y. Garces, Ming Luo, Chunchuan Xu, Lihai Bai, L. A. BoatnerZinc oxide crystals grown by the seeded chemical vapor transport method have been annealed in zinc vapor at 1100 °C for 30 min. These thermochemical reduction treatments produce a deep red coloration in the crystals and increase their n-type electrical conductivity. Electron paramagnetic... (Read more)
- 12. J. Magn. Magn. Mater. 302, 118 (2005) , “Magnetism origin of Mn-doped ZnO nanoclusters”, J.H. Li, D.Z. Shen, J.Y. Zhang, D.X. Zhao, B.S. Li, Y.M. Lu, Y.C. Liu , X.W. FanZnMnO nanoclusters were synthesized by the sol–gel method. The structural and magnetic characters were investigated. The XRD spectrum shows ZnMnO nanoclusters are hexagonal wurtzite structures and a small quantity of ZnMn2O4 phase is also present in the spectrum. The percentages of Zn and Mn... (Read more)
- 13. Spectrochim. Acta A. 61, 2595-2602 (2005) , “VO2+ ions in zinc lead borate glasses studied by EPR and optical absorption techniques”, P. Giri Prakash , J. Lakshmana RaoElectron paramagnetic resonance (EPR) and optical absorption spectra of vanadyl ions in zinc lead borate (ZnO–PbO–B2O3) glass system have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of VO2+ ions. The values of spin-Hamiltonian parameters... (Read more)
- 14. J. Phys. Chem. Solids 64, 1027-1035 (2003) , “Optical absorption and fluorescence properties of Er3+ ion in MO–WO3–P2O5 glasses”, P. Subbalakshmi , N. VeeraiahTungsten phosphate glasses mixed with the three different modifier oxides, viz. PbO, ZnO and CaO doped with Er2O3 were prepared. The glasses were characterised by X-ray diffraction spectra, electron microscopy and differential thermal analysis. Optical absorption and photoluminescence spectra of... (Read more)
- 15. Mater. Sci. Eng. A 332, 356-361 (2002) , “The preparation and characterization of ZnO ultrafine particles”, Liqiang Jing, Zili Xu, Jing Shang, Xiaojun Sun, Weimin Cai and Haichen GuoIn this paper, ZnO ultrafine particles (UFPs) were prepared by the thermal decomposition method of the precursor, zinc carbonate hydroxide. The structure and properties of the as-prepared ZnO UFPs were studied using TEM, XRD, BET, SPS, ESR, Raman, XPS and UV–Vis absorption spectroscopy. It... (Read more)
- 16. Appl. Catalysis A 213, 173-177 (2001) , “In situ electron paramagnetic resonance (EPR) study of surface oxygen species on Au/ZnO catalyst for low-temperature carbon monoxide oxidation”, Zhengping Hao, Liangbo Fen, G. Q. Lu, Jianjun Liu, Lidun An and Hongli WangSome paramagnetic superoxide ions detectable by electron paramagnetic resonance (EPR) can be generated on Au/ZnO catalyst by oxygen adsorption at room temperature as well as at 553 K. In both the cases, the O2− ions are present on the catalyst surface. The disappearance of the O2−... (Read more)
- 17. Appl. Surf. Sci. 180, 308-314 (2001) , “The surface properties and photocatalytic activities of ZnO ultrafine particles”, Liqiang Jing, Zili Xu, Xiaojun Sun, Jing Shang and Weimin CaiWe prepared ZnO ultrafine particles (UFPs) by thermal decomposition of the precursor zinc carbonate hydroxide. The surface properties of the as-prepared particles were studied using TEM, XRD, BET, SPS, EPR, IR, and XPS. The surface contains active species such as oxygen deficiencies and hydroxyl... (Read more)
- 18. Mater. Lett. 33, 247-250 (1998) , “Electron spin resonance properties of ZnO microcrystallites”, Baolong Yu, Congshan Zhu, Fuxi Gan , Yabin HuangThe preparation of ZnO microcrystallites using a microemulsion method and their electron spin resonance (ESR) properties are reported for the first time. It was found that the ZnO microcrystallite exhibits an ESR signal at room temperature, in contrast to that of bulk ZnO. The results confirmed that... (Read more)
- 19. Appl. Phys. Lett. 68, 403 (1996) , “Correlation between photoluminescence and oxygen vacancies in ZnO phosphors”, K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, and J. A. VoigtBy combining electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy, a strong correlation is observed between the green 510 nm emission, the free-carrier concentration, and the density of singly ionized oxygen vacancies in commercial ZnO phosphor powders.... (Read more)
- 20. J. Appl. Phys. 79, 7983-7990 (1996) , “Mechanisms behind green photoluminescence in ZnO phosphor powders”, K. Vanheusden, W. L. Warren, C. H. Seager, D. R. Tallant, J. A. Voigt, B. E. GnadeWe explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen-vacancy density in commercial ZnO phosphors by combining photoluminescence, optical-absorption, and electron-paramagnetic-resonance spectroscopies. We find that the green... (Read more)
- 21. Appl. Phys. Lett. 67, 1280 (1995) , “Impact of Pb doping on the optical and electronic properties of ZnO powders”, K. Vanheusden, W. L. Warren, J. A. Voigt, C. H. Seager, and D. R. TallantElectron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy have been combined to characterize Pb-doped ZnO ceramic powders. We observe a decrease in the 2.26 eV emission peak and a concomitant smearing of the band edges, narrowing the effective gap of the... (Read more)
- 22. J. Vac. Sci. Technol. 15, 1298-1310 (1978) , “Reactions of oxygen with ZnO–100-surfaces”, W. GöpelInvestigations are reported on the reaction of oxygen with electrostatic neutral ZnO100-surfaces studied by means of AES, LEED, EPR, thermal desorption spectroscopy, and isotopic exchange as well as changes in the surface conductivity and work function. Geometric and electronic structures of... (Read more)
- 23. Z. Physik B 23, 171-181 (1976) , “Intrinsic Defects in Electron Irradiated Zinc Oxide”, B. Schallenberge, A. Hausmann
- 24. J. Chem. Phys. 60, 2148-2151 (1974) , “Formation of O– in ZnO from the dissociation of adsorbed N2O”, Ning-Bew Wong, Younes Ben Taarit, and Jack H. LunsfordPhotoinduced O ions or V-type centers have been detected in ZnO following ultraviolet irradiation at 196°C. The EPR spectrum of the ions is characterized by g=2.021 and g = 2.0026. The concentration of O was greatly... (Read more)
- 25. Advances in Molecular Relaxation Processes 5, 211-218 (1973) , “Chemisorption of oxygen on transition metal oxides studied by EPR”, Krystyna DyrekThe method was applied to the investigation of adsorption of oxygen on the transition metal oxides MnO, FeO, CoO, Cu2O, and their solid solutions in the diamagnetic matrices ZnO and MgO. It has been found that in the case of pure oxides and their solid solutions at high magnetic metal ion... (Read more)
- 26. J. Vac. Sci. Technol. 9, 87-90 (1972) , “Properties of ZnO Films Prepared by dc and rf Diode Sputtering”, J. VuillodA brief description of the dc and rf diode sputtering unit is first presented. The study of properties of the films is reviewed taking into consideration two main parameters, oxygen partial pressure and substrate temperature. Reflection electron diffraction and x-ray diffraction studies show that... (Read more)
- 27. Solid State Commun. 11, 1547-1550 (1972) , “Oxygen displacement energy in ZnO”, J. M. MeeseD. R. LockerA displacement threshold at 310 keV has been observed by electrical measurements in single crystal ZnO and has been identified as the minimum electron energy required for oxygen displacements by observing the production of F- centers above this threshold with EPR. (Read more)
- 28. Surf. Sci. 13, 251-262 (1969) , “ESR studies of the interaction of O2, NO2, N2O, NO and Cl2 with zinc oxide”, R. D. Iyengar, V. V. Subba Rao , A. C. ZettlemoyerAn electron spin resonance study of the surface interaction of zinc oxide with oxygen, oxides of nitrogen (NO2, NO and N2O) and chlorine was made. Characteristic spectra obtained following adsorption of NO2 and NO were analyzed and attributed to rigidly adsorbed neutral molecules. Confirmation of... (Read more)
- 29. J. Catalysis 12, 278-280 (1968) , “An ESR investigation of nitrobenzene adsorbed on zinc oxide”, V. V. Subba Rao, R. D. Iyengar and A. C. ZettlemoyerAn ESR study of the interaction of nitrobenzene with nonstoichiometric ZnO surfaces was made. A 3-line spectrum with g values 1.9840, 2.0055 and 2.0225 was observed and was identified as due to nitrobenzene anion radicals strongly held to the surface. An unidentified signal at g = 2.0050 was left... (Read more)
- 30. J. Catalysis 9, 331-335 (1967) , “ESR evidence of CO oxidation by more than one oxygen species sorbed on ZnO”, Kenneth M. SancierAn approach is described for investigating the nature of sorbed oxygen species on a semiconductor catalyst surface and for determining their relative reactivities in a heterogeneous oxidation reaction. Experimental information as to the types of oxygen species on ZnO with presorbed oxygen, ZnO... (Read more)
- 31. J. Catalysis 5, 314-324 (1966) , “ESR investigation of gas-solid interactions* The oxygen-zinc oxide system”, K.M. SancierESR measurements were combined with determinations of the amount of oxygen adsorbed or desorbed on ZnO in order to investigate the relationship between the solid state electronic properties of a semiconductor catalyst and the amounts and the nature of the adsorbed oxygen species. (Read more)
« Previous
1
Next »
(31 hits, 1/1)
Showing
10, 25, 50, 100, 500, 1000, all papers per page.
Sort by:
last publication date,
older publication date,
last update date.
All papers (3399)
Updated at 2010-07-20 16:50:39
Updated at 2010-07-20 16:50:39
(view as: tree
,
cloud
)
1329 | untagged |
Materials
(111 tags)
Others(101 tags)
Technique
(46 tags)
Details
(591 tags)
Bond(35 tags)
Defect(interstitial)(18 tags)
Defect(vacancy)(15 tags)
Defect-type(19 tags)
Element(65 tags)
Energy(8 tags)
Isotope(56 tags)
Label(303 tags)
Sample(17 tags)
Spin(8 tags)
Symmetry(15 tags)