Valence behavior of europium in EuPd<SUB>3</SUB>B<SUB>x</SUB> (0&#8804;x&#8804;1) alloys: possible charge ordering in EuPd<SUB>3</SUB>B

Extensive 151Eu Mossbauer-effect studies in a wide range of temperatures (700-1.4 K) are reported for the samples EuPd3B0.5 and EuPd3B. The valence of europium, which is trivalent in EuPd3, is observed to change with boron content. The temperature dependence of the Mossbauer spectrum in EuPd3B suggests that europium ions undergo charge ordering at low temperature