Ho2Hf2O7 — Properties & Data | MatWorld

Ho2Hf2O7

ceramic

· JVASP-34314· Ho2Hf2O7

Ho₂Hf₂O₇ is a rare-earth hafnium oxide ceramic belonging to the pyrochlore family, engineered for extreme high-temperature thermal management applications. This material is primarily investigated for thermal barrier coatings and refractory applications in aerospace and advanced energy systems, where its hafnium base provides superior oxidation resistance and structural stability at temperatures exceeding conventional alumina-based systems. As a research compound, Ho₂Hf₂O₇ represents the broader class of rare-earth pyrochlores being developed to replace yttria-stabilized zirconia (YSZ) in next-generation gas turbines and hypersonic vehicle applications where enhanced thermal insulation and resistance to sintering degradation are critical.

thermal barrier coatingsjet engine turbine componentsrefractory materialsaerospace thermal protectionadvanced gas turbineshigh-temperature insulation

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Density(ρ)	0.3361	lb/in³	DFT · OptB88vdW

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	3.203	eV	DFT · OptB88vdW
↳	4.835	eV	DFT · TBmBJ
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	4.526	-	DFT · OptB88vdW
↳	2.441	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.6600	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	1.380	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000843	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00200	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-152.5	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	381.3	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	0.000	%	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.

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Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.00660	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-3.826	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.

Ho2Hf2O7

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental