8Y-CSZ Zirconia Powder — 8 mol% Yttria Fully-Stabilized Cubic Zirconia (Tosoh TZ-8Y Equivalent)
SEMITECH 8Y-CSZ is a co-precipitated, spray-dried powder containing 8 mol% Y₂O₃ (13.6 wt%), fully stabilizing the cubic fluorite structure for ionic conductivity of 0.10–0.13 S/cm at 1000°C — the benchmark for SOFC electrolytes, lambda sensors, and electrochemical oxygen systems. Engineered to match Tosoh TZ-8Y and TZ-8YS specifications.
Technical Specifications
| Parameter | Unit | Typical Value | Test Method |
|---|---|---|---|
| ZrO₂ + HfO₂ content | wt% | ≥86.0 | XRF (GB/T 26009) |
| Y₂O₃ content | wt% | 13.6 ± 0.30 | XRF |
| HfO₂ content | wt% | ≤2.0 | XRF |
| Al₂O₃ content | wt% | ≤0.10 | XRF |
| SiO₂ | wt% | ≤0.02 | ICP-OES |
| Fe₂O₃ | wt% | ≤0.005 | ICP-OES |
| Na₂O | wt% | ≤0.02 | ICP-OES |
| Loss on ignition (1050°C) | wt% | ≤1.5 | Gravimetric |
| Median particle size d50 (spray-dried) | μm | 30–80 | Laser diffraction (ISO 13320) |
| Median particle size d50 (milled) | μm | 0.3–0.5 | Laser diffraction |
| BET specific surface area | m²/g | 6–12 | N₂ adsorption (ISO 9277) |
| Cubic phase content | % | ≥95 | XRD (Rietveld refinement) |
| Sintered density (1500°C / 4h) | g/cm³ | ≥5.90 | Archimedes method |
| Relative density (sintered) | % | ≥99.0 | — |
| Ionic conductivity (1000°C) | S/cm | 0.10–0.13 | EIS (4-point AC impedance) |
| Ionic conductivity (800°C) | S/cm | 0.03–0.05 | EIS (4-point AC impedance) |
| Thermal expansion coefficient (RT–1000°C) | 10⁻⁶/K | 10.5–11.0 | Dilatometry (ASTM E228) |
Application Suggestions
Solid Oxide Fuel Cell (SOFC) Electrolytes
Industry-standard electrolyte for 700–1000°C SOFCs. Attrition-milled grade (d50 0.3–0.5 μm) optimized for tape casting and screen printing. Achieves >99% density at 1400–1500°C with grain size <5 μm for thermal cycling integrity.
Thermal Barrier Coatings (TBC)
Standard topcoat material for gas turbine blades via EB-PVD or APS. Low thermal conductivity (0.8–1.2 W/m·K for porous APS) with thermal expansion (10.5–11.0 × 10⁻⁶/K) matching Ni-based superalloys. Spray-dried grade (d50 30–80 μm) formulated for APS torch feed.
Automotive Lambda Oxygen Sensors
Dense 8Y-CSZ membrane generates Nernst voltage across exhaust/reference chambers at 300–800°C. Fe₂O₃ ≤0.005 wt% and Na₂O ≤0.02 wt% prevent electronic conductivity errors.
Electrochemical Oxygen Pumps and Generators
Dense membranes with Pt or LSM electrodes separate oxygen at >99.5% purity for medical concentrators and laboratory sources.
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Technical Support & FAQ: 8Y-CSZ Zirconia Powder
+Q1: What sintering conditions achieve >99% density?
1450–1500°C, 2–4 h hold, 2–3°C/min ramp rates. For SOFC co-sintering with NiO-YSZ anodes, adjust to 1400–1450°C to match shrinkage. Dilatometry data available.
+Q2: How does SiO₂ impurity affect ionic conductivity?
Grain-boundary silicate glass reduces conductivity 10–30% above 0.05 wt%. Standard grade is ≤0.02 wt%; low-silica variant (≤0.005 wt%) available at MOQ 100 kg.
+Q3: Is 8Y-CSZ suitable for IT-SOFCs below 700°C?
At 600–700°C, conductivity drops to 0.01–0.03 S/cm. Consider GDC/SDC or ScSZ electrolytes for 3–5x higher conductivity. Contact info@semitechnm.com for alternatives.
+Q4: What are pricing and lead times?
7–14 days, MOQ 25 kg. 30–50% below Tosoh TZ-8Y. Low-silica variant: 4–6 weeks, MOQ 100 kg. Free 1 kg samples with CoA.
Packing & Storage Information
25 kg kraft bags with PE liner, palletized. 500 kg FIBC for bulk. Store at <60% RH — moisture above 0.5 wt% affects tape-casting rheology. Shelf life 24 months sealed.