학술논문

Structural phase transitions and dielectric anomaly in YFe2O4-δ
Document Type
Article
Source
Journal of the Korean Physical Society, 46(1), pp.192-194 Jan, 2005
Subject
물리학
Language
ISSN
1976-8524
0374-4884
Abstract
We examined structural changes related to charge ordering (CO) in the temperature window between 100 K and room temperature (RT) in YFe2O4 by transmission electron microscopy. Characteristic diuse scattering elongated along the [001] direction through the (1/3 1/3 0)-type reciprocal positions was found at RT, which is related to the microdomains due to the CO with a size of 10 { 20 nm. In addition, it was also found that the superlattice structures characterized by the (1/3 { 1/3 + 0)-type modulation vector, which should be due to the vacancy ordering,coexist with the microdomains due to the CO. On the other hand, in stoichimetric YFe2O4, we found temperature variations of the superlattice structures on warming from 100 K, which should be strongly related to the dielectric anomalies in YFe2O4.