NpSi — Properties & Data | MatWorld

NpSi

ceramic

· JVASP-13890· NpSi

NpSi is a neptunium silicide ceramic compound representing a dense intermetallic material within the actinide-silicon family. This material is primarily encountered in nuclear materials research and specialized refractory applications where extreme thermal stability and radiation resistance are required. Its significance lies in fundamental materials science studies of actinide compounds and potential applications in advanced nuclear fuel forms or high-temperature nuclear system components, though it remains largely experimental rather than widely commercialized.

nuclear fuel researchactinide materials studieshigh-temperature refractoriesradiation-resistant ceramicsadvanced nuclear systems

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Density(ρ)	12.78	kg/m³	DFT · OptB88vdW

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Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)	0.000	eV	DFT · OptB88vdW
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000705	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000694	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	8.590	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	8.557	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C

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.

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Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.2430	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-0.05005	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.

NpSi

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental