Effect of crystal size on chemical hysteresis in praseodymium and terbium oxides

Journal Article · Mon Sep 01 00:00:00 EDT 1975 · J. Solid State Chem., v. 15, no. 1, pp. 9-17

DOI:https://doi.org/10.1016/0022-4596(75)90265-0· OSTI ID:4180720

Lowe, A T; Lau, K H; Eyring, L

The effect of the variation of crystal size on chemical hysteresis in phase reactions has been investigated by means of thermogravimetric analysis. Series of isobars were followed at several different pressures and crystal sizes for the PrO/sub x/--O$sub 2$ and TbO/sub x/--O$sub 2$ systems. At higher temperatures the extent of hysteresis decreased with increase in crystal size for both oxides. It was found that equilibrium was not attained in reactions occurring at lower temperatures. These experiments are contrasted with previous investigations using powdered samples. Some plausible explanations for the trends observed are discussed. (auth)

• Research Organization: Arizona State Univ., Tempe
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-003462
• OSTI ID: 4180720
• Journal Information: J. Solid State Chem., v. 15, no. 1, pp. 9-17, Journal Name: J. Solid State Chem., v. 15, no. 1, pp. 9-17; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

*PRASEODYMIUM OXIDES-- PHASE TRANSFORMATIONS
*TERBIUM OXIDES-- PHASE TRANSFORMATIONS
360202* --Materials--Ceramics
Cermets & Refractories-- Structure & Phase Studies
CHEMICAL COMPOSITION
GRAIN SIZE
HYSTERESIS
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
QUANTITY RATIO
TRANSITION TEMPERATURE