scholarly journals Interaction of low-expansion NZP ceramics with Na{sub 2}SO{sub 4} at 1000{degrees}C

1996 ◽  
Author(s):  
W Y Lee ◽  
D P Stinton ◽  
D L Joslin
Keyword(s):  
Nzp Ceramics

Thermophysical Properties of NZP Ceramics (A Review)

2004 ◽  
Vol 61 (7/8) ◽  
pp. 233-239 ◽  
Author(s):  
V. I. Pet'kov ◽  
E. A. Asabina
Keyword(s):  
Thermophysical Properties ◽  
Nzp Ceramics

Epr of Fe3+ and Cr3+ Ions in NZP Ceramics

1999 ◽  
Vol 556 ◽  
Author(s):  
A. Y. Troole ◽  
S. V. Stefanovsky ◽  
L. D. Bogomolova
Keyword(s):  
Thermodynamic Stability ◽  
Zirconium Phosphate ◽  
Coordination Polyhedra ◽  
Sodium Zirconium ◽  
Distortion Analysis ◽  
The Stability ◽  
Nzp Ceramics ◽  
Nzp Structure ◽  
Sodium Zirconium Phosphate

AbstractA new method to estimate the thermodynamic stability of crystalline host phases for radwaste is based on the determination of the degree of coordination polyhedra distortion. Analysis of the stability of sodium zirconium phosphate (NZP) structure containing Fe and Cr has been completed. The NZP structure can incorporate a limited amount of iron (∼2 mol. % Fe2o3). From the EPR study, Fe3+ and Cr3+ ions occupy two different structural positions substituting for Zr4+and Na+. Moreover, these ions can enter extra phases.

GEL Adsorption Processing for Waste Solidification in 'NZP' Ceramics

1983 ◽  
Vol 26 ◽  
Author(s):  
L.J. Yang ◽  
S. Komarneni ◽  
R. Roy
Keyword(s):  
Zirconium Phosphate ◽  
Adsorption Process ◽  
Hydrothermal Conditions ◽  
Waste Solution ◽  
Waste Forms ◽  
Sodium Zirconium ◽  
Reducing Conditions ◽  
Adsorption Processing ◽  
Nzp Ceramics ◽  
Sodium Zirconium Phosphate

ABSTRACTSimulated PW-4b waste solution along with Na additive was mixed with Zr-P-O gel, dried and then fired to form the desired sodium zirconium phosphate, NaZr2 (PO4) 3 [NZP] ceramic. NZP and monazite were the only phases produced upon firing at 900°C with 10 to 40% of PW-4b mixed with the gel. CsZr2(PO4) 3 which is isostructural with NZP was also identified when fired under reducing conditions. The -200 mesh powders of these waste forms prepared under reducing conditions showed excellent leach resistance under hydrothermal conditions.Alternatively, PW-4b and Three Mile Island (TMI) wastes were adsorbed on Zr-P-O gel in a column. The gel was dried, pelletized and fired to form the desired [NZP] ceramic. Cesium was found to be selective on the Zr-P-O gel because no breakthrough of Cs was detected up to 38 column volumes of TMI waste. Thus, it is possible to use a tailored gel to sorb Cs and/or Sr from accident waste water and then fired the bed to form the [NZP] ceramic below 1000°C. The main advantages of the gel adsorption process are its simplicity and its enormous compositional flexibility.

Interaction of Low-Expansion NZP Ceramics with Na2SO4 at 1000oC

1996 ◽  
Vol 79 (2) ◽  
pp. 484-486 ◽  
Author(s):  
Woo Y. Lee ◽  
David P. Stinton ◽  
Debra L. Joslin
Keyword(s):  
Nzp Ceramics

scholarly journals Joining NZP ceramics. Final report

1995 ◽  
Author(s):  
K.D. Nicklas ◽  
M.W. Richey ◽  
C.E. Jr. Holcombe ◽  
M.L. Santella
Keyword(s):  
Final Report ◽  
Nzp Ceramics
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