A study of nonstoichiometry and the electrical conductivity of erbium sesquioxide

• Published in: The Journal of physics and chemistry of solids Vol. 48; no. 8; pp. 733 - 737
• Main Authors: Yo, Chul Hyun, Park, Sung Ho, Choi, Jae Shi, Moo Sil Pyon
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1987; Elsevier
• Subjects: activation energy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; defect; electrical conductivity; Electronic transport in condensed matter; Exact sciences and technology; excess oxygen; mechanism; Mixed conductivity and conductivity transitions; Nonstoichiometry; Physics; vacancy; weight change; excess oxygen; defect; weight change; activation energy; electrical conductivity; mechanism; vacancy; Nonstoichiometry; Oxygen; Temperature; Electrical conductivity; Vacancy; Erbium Oxides; Thermogravimetry; High temperature; Experimental study; Controlled atmosphere; Non stoichiometric composition; Heat of solution; Inorganic compound; Partial pressure; Lanthanide Compounds; P type conductivity; Activation energy
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/0022-3697(87)90068-0

The nonstoichiometric composition of Er 2 O 3 and the electrical conductivity of Er 2 O 3 were measured in the temperature range of 800–1050°C under oxygen partial pressure from 10 −5 to 2 × 10 −1 atm. The nonstoichiometric deviation, x in Er 2 O 3+ x was found to be <0.006. The heat of oxygen dissolution and the activation energy were obtained to be 29.8 and 31.4 kcal mole , respectively. The conductivity and nonstoichiometric deviation of Er 2 O 3 are proportional to P(O 2) 1 5.3 . It was concluded that Er 2 O 3 shows a metal deficient nonstoichiometry and that the random distribution approximation holds for the metal defects.