NaS — Properties & Data | MatWorld

NaS

Name: NaS
Brand: MatWorld

ceramic

· NaS

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.

sodium–sulfur batteriesgrid energy storagehigh-temperature electrochemistryrenewable energy systemsbackup power supplies

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	28.49	GPa	DFT · OptB88vdW
Poisson's Ratio(ν)	0.2500	-	DFT · OptB88vdW
Shear Modulus(G)	16.79	GPa	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Density(ρ)	2.080	kg/m³	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

Filter by

Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	1.278	eV	DFT · OptB88vdW
↳	2.757	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)2 entries	10.12	-	DFT · OptB88vdW
↳	8.230	-	DFT · PBE
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	4.640	-	DFT · OptB88vdW
↳	3.195	-	DFT · TBmBJ
Electronic Dielectric Tensor(ε∞)	Matrix (redacted)	-	DFT · PBE
Total Dielectric Tensor(ε)	Matrix (redacted)	-	DFT · PBE
Electron Effective Mass(m*e)	0.5100	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	2.850	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)2 entries	0.000	C/m²	DFT · OptB88vdW
↳	0.05717	C/m²	DFT · PBE
Piezoelectric Stress Tensor(eij)	Matrix (redacted)	C/m²	DFT · PBE
Thermoelectric Power Factor(PF)2 entries	0.000879	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00222	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-122.9	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	354.1	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	7.830	%	DFT · TBmBJ

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Filter by

Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.000	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-0.9691	eV/atom	DFT · OptB88vdW
↳	-1.029	eV/atom	Measured

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

Regulatory Screening

Environmental

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.

NaS

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental