Deuterium absorption and material phase characteristics of Zr[sub 2]Fe
Scanning electron microscope (SEM) images of polished surfaces, electron probe microanalysis, and X-ray powder diffractometry indicated the presence of a continuous Zr[sub 2]Fe phase with secondary phases of ZrFe[sub 2], Zr[sub 5]FeSn, [alpha]-Zr, and Zr[sub 6]Fe[sub 3]O. A statistically-designed experiment to determine the effects of temperature, time, and vacuum quality On activation of St 198 revealed that when activated at low temperature (350[degrees]C) deuterium absorption rate was slower when the vacuum quality was pwr (2.5 Pa vs. 3[times]10[sup [minus]4] Pa). However, at higher activation temperature (500[degrees]C), deuterium absorption rate was fast and was independent of vacuum quality. Deuterium pressure-composition-temperature (P-C-T) data are reported for St 198 in the temperature range 200--500[degrees]C. The P-C-T data over the full range of deuterium loading and at temperatures of 350[degrees]C and below is described by: K[sub 0e]-([Delta]H[sub [alpha]]/RT)=PD[sub 2]q[sup 2]/(q*[minus]q)[sup 2] where [Delta]H[alpha] and K[sub 0] have values of 101.8 kJ[center dot]mole[sup [minus]1] and 3.24[times]10[sup [minus]8]Pa[sup [minus]1], and q* is 15.998 kPa[center dot]L[sup [minus]1][center dot]g[sup [minus]1]. At higher temperatures, one or more secondary reactions in the solid phase occur that slowly consume D[sub 2] from the gas phase. XRD suggests these reactions to be: 2 Zr[sub 2]FeD[sub x] [yields] x ZrD[sub 2] + x/3 ZrFe[sub 2] + (2 [minus] 2/3x) Zr[sub 2]Fe and Zr[sub 2]FeD[sub x] + (2 [minus]1/2x) D[sub 2] [yields] ZrD[sub 2] + Fe, where 0 < x < 3. Reaction between gas phase deuterium and Zr2FC formed in the first reaction accounts for the observed consumption of deuterium from the gas phase by this reaction.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 6564362
- Report Number(s):
- WSRC-TR-92-557; ON: DE93011777
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deuterium absorption and material phase characteristics of SAES St 198 Zr-Fe Alloy. Revision 1
Removal of deuterium from flowing nitrogen by SAES St 198
Related Subjects
36 MATERIALS SCIENCE
DEUTERIUM
ADSORPTION
IRON ALLOYS
SORPTIVE PROPERTIES
ZIRCONIUM BASE ALLOYS
DEUTERATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
ALLOYS
CHEMICAL REACTIONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
SORPTION
STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE RANGE
ZIRCONIUM ALLOYS
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
360104 - Metals & Alloys- Physical Properties