Electron spin resonance studies on zinc peroxide and on zinc oxide obtained from a decomposition of zinc peroxide

Iyengar, R. D.; Rao, V. V. Subba

doi:10.1021/j100689a009

Cited by 17 publications

(11 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These EPR signals result from oxygen vacancies and carbon impurities as described in a previous publication and are not discussed here in further detail. 7, 29 When Cr III is present in the material, an additional signal appears at g = 1.97 with a width of ª 60 G. This g-value and coupling is in good agreement with findings reported in the literature for a weak interaction between Cr III centres. 30 Isolated Cr III -ions, which are supposed to give an EPR signal at around g = 4.7, were not detected in any significant amounts.…”

Section: Materials With Low Chromium Contentsupporting

confidence: 90%

Chromium containing zinc oxide materials from organobimetallic precursors

et al. 2010

View full text Add to dashboard Cite

Zinc oxide has become one of the most important semiconductor materials and it possesses a multitude of properties and applications. An even wider spectrum of properties can be envisioned if an additional element is introduced. On the cation side there is large interest in the combination of ZnO with paramagnetic metal centres like Cr(III). Two new single source precursors containing "ZnO" and chromium in the ratios 1 : 1 and 1 : 2 are presented. Advantages and disadvantages of using these precursors are reported. One of the advantages is that the geometric organization of the magnetic centres in the ZnO matrix can be preorganized on the molecular scale.

show abstract

Section: Materials With Low Chromium Contentsupporting

confidence: 90%

Chromium containing zinc oxide materials from organobimetallic precursors

et al. 2010

View full text Add to dashboard Cite

show abstract

“…It is clearly seen that the ZnO sample mainly contains radical-like ( S = 1/2) paramagnetic species characterized by g = 1.962 ± 0.001 and spin density N s = 1.7 × 10 16 spin/g. Signals of this type, previously observed in various ZnO samples, were attributed to shallow donors, originated probably from the interstitial zinc. , In this sample, the intensity of a signal with g ∼ 2.004 slightly exceeds the noise level, which allows estimating its N s as below 10 15 spin/g. Analysis of the microwave power saturation of this signal intensity provides quite short electron spin–lattice ( T SLe ) and spin–spin ( T SSe ) relaxation times for this paramagnetic center in ZnO: T Sle = 5 × 10 –8 s and T SSe = 8 × 10 –9 s (experimental errors do not exceed 20%).…”

Section: Resultssupporting

confidence: 53%

Unusual Stabilization of Zinc Peroxide by Manganese Oxide: Mechanistic Understanding by Temperature-Dependent EPR Studies

et al. 2019

View full text Add to dashboard Cite

Nanocrystalline zinc peroxide is passivated against further oxidation by the addition of minute, substoichiometric amounts of potassium permanganate, which also endows it with increased thermal stability. The oxidation state of manganese and the passivation mechanism are deciphered by a comparative electron paramagnetic resonance (EPR) study of the manganese-doped zinc peroxide nanoparticles and manganese oxide formed by reduction of permanganate by hydrogen peroxide as well as unmodified ZnO2 nanoparticles. Temperature-dependent in situ EPR studies at elevated temperatures allowed us to trace simultaneously the temperature-dependent changes in abundance of superoxide radicals and the formation of Mn(IV) species and also to identify Mn(III) species at cryotemperatures. We conclude that the passivation is caused by Mn(III) complexes that act as antioxidants removing superoxide radicals, which are abundant in zinc peroxide and even more so in the manganese-doped zinc peroxide.

show abstract

“…18) forms a slightly distorted variant of this structure type Ductoforrmtionofparamgncticspccicslikc02 orHO^ drying of hydrous group-lib peroxides in an oxygen atmosphere yielded EPR -active materials, while desiccator dried products are diamagnetic [200,233].…”

Section: 22t Crystal Structures Of <3royp-nb Metat Peroxidesmentioning

confidence: 99%

“…Though several reaction mechanisms for the thermal decomposition of hydrous zinc-and cadmium peroxides have been suggested, it has not been possible to determine the true nature of the occuring paramagnetic species [200,229,233].…”

Section: 22t Crystal Structures Of <3royp-nb Metat Peroxidesmentioning

confidence: 99%