Pseudophase behavior in the epsilon and iota regions of the praseodymium oxide--oxygen system
Technical Report
·
OSTI ID:4402042
Besides line and nonstoichiometric phases, complex oxide systems exhibit reproducible bivariant behavior, termed pseudophases, in the two-phase regions which lead to hysteresis. Two of these pseudophases in the praseodymium oxide -- oxygen system are examined in detail by tensimetric and high temperature x-ray studies. The tensimetric measurements show marked and progressive shifting of the curves away from stoichiometry with increasing pressure. In addition, unusual reversals are seen to occur both in oxidation and reduction. X-ray- diffraction patterns at temperature are seen to show systematic changes in line positions and line widths. These are analyzed and their implications discussed in terms of suggested structural changes. Similarities and relevance to other systems are discussed. (auth)
- Research Organization:
- Arizona State Univ., Tempe (USA)
- NSA Number:
- NSA-29-010593
- OSTI ID:
- 4402042
- Report Number(s):
- COO--1109-71
- Country of Publication:
- United States
- Language:
- English
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Sat Dec 31 23:00:00 EST 1960
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Pseudophase behavior in the epsilon and iota regions of the praseodymium oxide--oxygen system
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Related Subjects
*OXYGEN-- PHASE DIAGRAMS
*PRASEODYMIUM OXIDES-- PHASE DIAGRAMS
HIGH TEMPERATURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
STOICHIOMETRY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION STOICHIOMETRY
*PRASEODYMIUM OXIDES-- PHASE DIAGRAMS
HIGH TEMPERATURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
STOICHIOMETRY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION STOICHIOMETRY