Mg9Si5 — Properties & Data | MatWorld

Mg9Si5

ceramic

· Mg9Si5

Mg9Si5 is an intermetallic ceramic compound combining magnesium and silicon, belonging to the family of metal silicates and magnesium silicides. This material is primarily of research and development interest rather than a mature commercial product, being investigated for lightweight structural applications where the combination of low density with ceramic stiffness offers potential advantages over conventional metals and polymers. Researchers explore Mg9Si5 and related magnesium silicides in contexts requiring thermal stability, wear resistance, or weight reduction—particularly in aerospace and automotive applications where material efficiency is critical.

lightweight structural compositesaerospace components (research phase)automotive weight reductionhigh-temperature ceramic researchthermal barrier coatings (potential)metal-matrix composite reinforcement

Compliance & Regulations

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

Units:

si imperial

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Method

Property	Value	Unit	Conditions
Bulk Modulus(K)2 entries	58.64	GPa	DFT
↳	58.64	GPa	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	0.5635	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	Pa	DFT · PBE
Poisson's Ratio(ν)	0.2326	-	DFT · PBE
Shear Modulus(G)2 entries	38.17	GPa	DFT
↳	38.17	GPa	DFT · PBE

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
Density(ρ)	2.195	kg/m³	DFT · OptB88vdW

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Method

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	0.000	eV	DFT · OptB88vdW
↳	0.1270	eV	DFT · TBmBJ
High-Frequency Dielectric Constant (ε∞)(ε∞)	24.81	-	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	5.840	%	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)	0.03940	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-0.1667	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.

Mg9Si5

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental