Cation-enhanced chemical stability of ion-conducting zirconium-based ceramics
At least partial substitution of zirconium by hafnium in ion-conducting zirconium-based ceramics provides enhanced chemical stability in alkaline and acid environments.
1. An ion conducting ceramic comprising Na 1+x HF 2 P 3-x Si x O 12 .
2. The ion-conducting ceramic of claim 1 , wherein x=0.
3. A protective layer comprising an ion-conducting zirconium-based ceramic, wherein the zirconium is at least partially substituted by hafnium, that is coated onto another ion-conducting material comprising Na 3 Zr 2 PSi 2 O 12 that is susceptible to a different mechanism of degradation than the protective layer.
4. A protective layer comprising an ion-conducting zirconium-based ceramic, wherein the zirconium is at least partially substituted by hafnium, that is coated onto another ion-conducting material comprising Na 3 Zr 2 P 3 O 12 that is susceptible to a different mechanism of degradation than the protective layer.
5. A protective layer comprising an ion-conducting zirconium-based ceramic, wherein the zirconium is at least partially substituted by hafnium, that is coated onto another ion-conducting material comprising Na 1+x Zr 2 P 3-x Si x O 12 , wherein Zr is at least partially substituted by Hf, that is susceptible to a different mechanism of degradation than the protective layer.
6. The protective layer of claim 5 , wherein x=0.
7. A protective layer comprising Na 1+x Hf 2 P 3-x Si x O 12 that is coated onto another ion-conducting material that is susceptible to a different mechanism of degradation than the protective layer.
8. The protective layer of claim 7 , wherein x=0.
9. The protective layer of claim 7 , wherein the other ion-conducting material comprises Na 3 Zr 2 PSi 2 O 12 .
10. The protective layer of claim 7 , wherein the other ion-conducting material comprises Na 3 Zr 2 P 3 O 12 .