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AbstractAbstract
[en] The γ irradiation of KH2AsO4 crystals at room temperature (KDA) creates AsO32- radicals. These radicals (K, L, M) are characterized by a strong hyperfine interaction between the electron and nuclear spin of the 75As nucleus (I = 3/2), which appears in ESR spectra, under the form of four lines. An ENDOR investigation at 1.5 K was made for the L→L1 transformation involved in the ferroelectric phase, and the double K→K1 and K→Q1 transformation that appears at the Curie point (K1 is a AsO32- center but Q1 is of AsO44- type
[fr]
L'irradiation a temperature ambiante et aux rayons γ du crystal de KH2AsO4 (KDA) produit plusieurs radicaux de types AsO32-. Ces radicaux (K, L et M) sont caracterises par une forte interaction hyperfine entre le spin electronique et le spin nucleaire du noyau 75As (I = 3/2), ce qui se concretise sur les spectres R.P.E. par quatre raies. On a etudie par ENDOR a 1,5 K la tranformation L→L1 qui se produit en phase ferroelectrique, et la double tranformation K→K1 et K→Q1 qui se produit au point de Curie (K1 est de type AsO32- mais Q1 est de type AsO44-)Original Title
Etudes par R.P.E. et ENDOR de transformations radicalaires provoquees par la transition de phase para-ferroelectrique dans KH2AsO4 irradie
Source
CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France). Dept. de Recherche Fondamentale; p. 24-34; 1977; p. 24-34
Record Type
Report
Literature Type
Progress Report
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Country of publication
ALKALI METAL COMPOUNDS, ARSENIC ISOTOPES, BEAMS, DIELECTRIC MATERIALS, ELECTROMAGNETIC RADIATION, INTERMEDIATE MASS NUCLEI, IONIZING RADIATIONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MAGNETIC RESONANCE, NUCLEI, ODD-EVEN NUCLEI, PHASE TRANSFORMATIONS, RADIATIONS, RADIOISOTOPES, RESONANCE, SECONDS LIVING RADIOISOTOPES, STABLE ISOTOPES
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