K4 Rb4 S4

semiconductor

· K4 Rb4 S4

K₄Rb₄S₄ is an experimental alkali metal sulfide compound combining potassium and rubidium cations with a sulfide anion framework. This material belongs to the family of mixed-cation ionic semiconductors and represents a research-phase compound without established commercial production or widespread industrial adoption. Interest in such materials stems from their potential in solid-state ionics, photovoltaic applications, and as precursors for studying structure-property relationships in multimetallic sulfide systems, though practical engineering applications remain limited to laboratory investigations.

experimental semiconductorssolid-state ionic researchphotovoltaic materials developmentalkali metal chemistry studiesmaterials characterization

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)	3,128	ksi	—
Shear Modulus(G)	1,549	ksi	—

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

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	2.504	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-1.221	eV/atom	—

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

Regulatory Screening

Environmental

Export Control

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.

K4 Rb4 S4

Mechanical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control