TY - JOUR
T1 - EPR of the thermally produced CrO3- 4 in CrO2- 4-doped (NH4)3H(SeO4)2 crystals
AU - Wu, Ching Jiun
AU - Yu, Jiang Tsu
PY - 1991/8
Y1 - 1991/8
N2 - Two spin 1 2 paramagnetic species (species I and species II) are detected by electron paramagnetic resonance (EPR) in CrO2- 4-doped (NH4)3H(SeO4)2 single crystals, after the host crystals had been heated to temperatures well below their decomposition temperature. When heat treated at lower temperatures ({reversed tilde equals}90°C), only one species (species I) was detected by EPR. The EPR spectrum of this species was identical to that of the CrO3- 4 species produced by γ-irradiation of the sample crystals. By comparing the thermal treatment behaviors of the CrO2- 4-doped Rb3H(SeO4)2 and Cs3H(SeO4)2 crystals, it was established that the electronic defect acquired by the CrO2- 4 to form the thermally produced CrO3- 4 (I) originates from the NH+ 4 group. It is difficult to determine with certainty from the g-values alone the identity of species II. This species could be a CrO- 3 or a Cr5+ ion.
AB - Two spin 1 2 paramagnetic species (species I and species II) are detected by electron paramagnetic resonance (EPR) in CrO2- 4-doped (NH4)3H(SeO4)2 single crystals, after the host crystals had been heated to temperatures well below their decomposition temperature. When heat treated at lower temperatures ({reversed tilde equals}90°C), only one species (species I) was detected by EPR. The EPR spectrum of this species was identical to that of the CrO3- 4 species produced by γ-irradiation of the sample crystals. By comparing the thermal treatment behaviors of the CrO2- 4-doped Rb3H(SeO4)2 and Cs3H(SeO4)2 crystals, it was established that the electronic defect acquired by the CrO2- 4 to form the thermally produced CrO3- 4 (I) originates from the NH+ 4 group. It is difficult to determine with certainty from the g-values alone the identity of species II. This species could be a CrO- 3 or a Cr5+ ion.
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U2 - 10.1016/0022-4596(91)90329-G
DO - 10.1016/0022-4596(91)90329-G
M3 - Article
AN - SCOPUS:44949270443
SN - 0022-4596
VL - 93
SP - 549
EP - 555
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 2
ER -