NaYS2 — Properties & Data | MatWorld

NaYS2

ceramic

· NaYS2

NaYS₂ is an inorganic ceramic compound belonging to the rare-earth sulfide family, combining sodium, yttrium, and sulfur into a crystalline structure. This material is primarily of research and developmental interest for optical and electronic applications where rare-earth ceramics offer unique luminescent or semiconductive properties. While not yet widely commercialized, sodium yttrium sulfides represent the broader family of rare-earth sulfide ceramics being investigated for next-generation photonic devices, scintillators, and solid-state lighting systems.

Rare-earth ceramics researchOptical phosphors and luminescenceScintillator detector developmentSolid-state lighting (experimental)High-temperature electronics researchPhotonic device substrates

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	50.54	GPa	DFT · OptB88vdW
Poisson's Ratio(ν)	0.2300	-	DFT · OptB88vdW
Shear Modulus(G)	34.17	GPa	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	3.241	kg/m³	DFT · OptB88vdW

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

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	2.326	eV	DFT · OptB88vdW
↳	3.102	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)3 entries	15.20	-	DFT · OptB88vdW
↳	14.12	-	DFT · PBE
↳	9.411 range 5.436–13.38median of 2 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	5.783	-	DFT · OptB88vdW
↳	4.968	-	DFT · TBmBJ
Electronic Dielectric Tensor(ε∞)	Matrix (redacted)	-	DFT · PBE
Total Dielectric Tensor(ε)	Matrix (redacted)	-	DFT · PBE
Electron Effective Mass(m*e)	0.6567	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	1.487	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.000	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00289	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00209	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-259.4	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	333.9	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	3.460	%	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

Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.000800	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-2.038	eV/atom	DFT · OptB88vdW

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.

NaYS2

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental