English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Gamma-irradiated chlorapatite, synthesized from a CaCl2 fl ux, has been investigated by powder and single-crystal electron paramagnetic resonance (EPR) spectroscopy at X- and W-band frequencies, including in situ high-T X-band EPR. The powder EPR spectra, particularly high-T X-band spectra and high-resolution W-band spectra, reveal a new hole-like center, H(III), in addition to two previously reported hole-like centers, H(I) and H(II). Center H(III) is characterized by an electron spin ½ and hyperfi ne interaction with one 35Cl nucleus, suggesting a structural model consisting of a hole trapped by a substitutional oxygen ion adjacent to a Cl- ion vacancy in the anion column. This discovery of center H(III) also lends support to the structural model already proposed by other authors for center H(II). Single-crystal X-band EPR spectra also disclose a new electronic center, E(I). The structure model for center E(I) includes an electron trapped at an isolated Cl- ion vacancy in the anion column, corresponding to center FE(II) in fl uorapatite and similar to the well-known F center in alkali halides.

MULTIFREQUENCY EPR STUDY OF RADIATION-INDUCED DEFECTS IN CHLORAPATITE