Fabrication and characterization of NASICON ceramic electrolytes. Final technical progress report, November 1, 1978-March 31, 1980

Technical Report · Sun Jun 01 04:00:00 EDT 1980

OSTI ID:5398026

Scaled-up fabrication procedures have been developed for NASICON (Na/sub 1 + x/Zr/sub 2/Si/sub x/P/sub 3 - x/O/sub 12/) electrolytes (x = 2.0) involving (1) the mechanical mixing of raw materials (Na/sub 3/PO/sub 4/ 12H/sub 2/O, SiO/sub 2/, and ZrO/sub 2/), (2) calcination at 1160/sup 0/C, (3) dry ball milling, (4) isostatic pressing, and (5) sintering at 1230 to 1260/sup 0/C (4 to 24 h). Electrolyte tubes (16mm OD by 200mm long) possess acceptable dimensional tolerances, mass densities over 3.20 g/cm/sup 3/, sodium ion resistivities under 5 ohm-cm at 300/sup 0/C and diametral strengths of approximately 70 to 80 MPa. These electrolytes, which contain a small residual amount (up to about 5%) of free zirconia (ZrO/sub 2/), have demonstrated very poor static corrosion resistance in liquid sodium at 300 to 400/sup 0/C and very low endurance (0.2 to 1.4 Ah/cm/sup 2/ of charge passed at current densities up to 56 mA/cm/sup 2/) in sodium-sodium test cells operated at 300 to 340/sup 0/C.

• Research Organization: Ceramatec, Inc., Salt Lake City, UT (USA)
• DOE Contract Number: EC-78-C-01-5162
• OSTI ID: 5398026
• Report Number(s): DOE/TIC-2004973; COO-5162-18; ON: DE82004973
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALI METAL COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
ELECTROLYTES
FABRICATION
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SOLID ELECTROLYTES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES