Beta-ALUMINA
β′′-alumina Series Products
β″-alumina
Beta-alumina / β″-Al2O3
β″-alumina (rhombus: R3m) and β-alumina (hexagonal system: P63/mmc) are the two different crystal structures. The chemical composition of β-Al2O3 and β″-Al2O3 and the stacking sequence of oxygen ions between ionic conductive layers are different, β-alumina is Na2O·(8 ~ 11)Al2O3, β″-alumina is Na2O·(5 ~ 7)Al2O3, β-alumina is 2 spinel accumulation, β″-alumina is 3 spinel accumulation. The ionic conductivity of the beta phase is higher than that of the beta phase because it contains more Na+.
As a traditional sodium ion conductor material, NA-β′/β″-Al2O3 is widely used in the membranes and electrolytes of Na/S batteries and solid sodium ion batteries.
At present, our company can provide with three grades of β″-alumina products, B-D2, BM-D2 and B5L-D2.
| Typical Properties | Units | B-D2 | BM-D2 | B5L-D2 |
|---|---|---|---|---|
|
Crystal Phase (β”) ≥ |
% |
95 |
95 |
95 |
|
Average Particle Size (by Bettersize Laser 9300SE) |
D50, um |
1-3 |
1-3 |
1-3 |
|
Loose Bulk Density |
g/cm3 |
0.4-0.6 |
0.4-0.6 |
0.3-0.6 |
|
BET Surface Area |
m2/g |
5-15 |
5-15 |
10-30 |
|
Purity (Na2O·5Al2O3) ≥ |
% |
99.99 |
– |
– |
|
Purity (Na1.67Mg0.67Al10.33O17) ≥ |
% |
– |
99.99 |
– |
|
Purity (Na1.49Li0.25Al10.75O17) ≥ |
% |
– |
– |
99.99 |
|
Impurity ≤ (by ICP-OES) |
|
|
|
|
|
Ca |
ppm |
20 |
20 |
10 |
|
Mg |
ppm |
3 |
– |
5 |
|
Cu |
ppm |
3 |
3 |
5 |
|
Fe |
ppm |
10 |
10 |
5 |
|
Si |
ppm |
30 |
30 |
10 |
|
Packing (As per customer’s requests) |
drum |
25kg |
25kg |
25kg |