Sodium sulfide (NaS) is an inorganic ceramic compound consisting of sodium and sulfur elements, typically encountered as a solid at room temperature with ionic bonding characteristics. While NaS itself has limited structural applications, it is primarily significant as an intermediate material in the sodium–sulfur (Na–S) battery system, where molten sodium and sulfur react at elevated temperatures to generate electrical energy. NaS is valued in grid-scale energy storage and backup power systems due to the high energy density of Na–S batteries, making it a key material in the transition toward renewable energy infrastructure, though practical implementations typically use the battery cell assembly rather than bulk NaS ceramic alone.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K) | 4,132.1 | ksi | — | ||
Poisson's Ratio(ν) | 0.2500 | - | — | ||
Shear Modulus(G) | 2,435.2 | ksi | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.07514 | lb/in³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 1.278 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)2 entries | 8.230 | - | — | ||
| ↳ | 10.12 | - | — | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | — | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij)2 entries | 0.05717 | C/m² | — | ||
| ↳ | 0.000 | C/m² | — | ||
Piezoelectric Stress Tensor(eij) | Matrix (redacted) | C/m² | — | ||
Seebeck Coefficient(S) | -122.9 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.029 | eV/atom | — | ||
| ↳ | -0.9691 | eV/atom | — |