ScSZ (scandia-stabilized zirconia), used as the electrolyte in solid oxide fuel cells (SOFCs), has become substantially harder to source since scandium came under export control. This article summarizes the specification of 10Sc1CeSZ — the standard SOFC electrolyte material — and the supplier landscape across China, Japan, the US, and Korea, using public information, then offers selection criteria that weigh quality, price, regulatory risk, and lead time together. The bottom line up front: rather than depending on a single region, it is more realistic to dual-source along the axes of regulatory risk and price.
What Is ScSZ?
One of the standard SOFC electrolyte materials is 10Sc1CeSZ — zirconia stabilized with 10 mol% scandium oxide (Sc₂O₃) and 1 mol% cerium oxide (CeO₂). Adding scandia stabilizes zirconia's tetragonal/cubic phase and raises oxygen-ion conductivity, while a small amount of ceria reinforces phase stability.
A representative, publicly cited specification looks like this:
| Item | Representative spec |
|---|---|
| Composition | ZrO₂ stabilized with 10 mol% Sc₂O₃ + 1 mol% CeO₂ |
| Particle size (D50) | 0.4–0.6 µm |
| Specific surface area | 8–12 m²/g |
Because this fine powder must sinter into a thin, dense electrolyte membrane, lot-to-lot variation in particle size and surface area directly affects performance. Why scandium is so scarce and expensive is covered in Scandium: A Rare Metal Produced at Only ~40 Tonnes a Year.
Supplier Landscape by Region (Public Information)
The following is a landscape summary based on each company's published general profile; it does not indicate any specific trading relationship or terms.
China
- Chaozhou Sanhuan (CCTC): A large, vertically integrated ceramics company with a broad ceramic-materials portfolio. Price competitiveness is a strength.
- Hebei Suoyi: A supplier specializing in zirconia-family powders including ScSZ.
Chinese suppliers offer clear price competitiveness, but because ScSZ contains scandium at roughly 11%, it falls under the export controls of the April 2025 Announcement No. 18 — meaning each export requires a case-by-case MOFCOM license. For the structure of the controls and how to respond, see Scandium Export Controls and the SOFC Supply Chain.
Japan
- Daiichi Kigenso (DKKK): A supplier holding foundational zirconia technology, known for top-tier quality and lot uniformity. Pricing tends to be high, above $1,000/kg.
United States
- Nexceris / FuelCellMaterials: A fuel-cell materials specialist; ScSZ pricing is reported in roughly the $1,200–3,000/kg range.
Korea
- Domestic suppliers such as Kceracell: Using a domestically producing supplier minimizes customs and foreign-exchange risk, with additional advantages in lead time and communication.
Supplier Selection Matrix
ScSZ suppliers cannot be ranked along a single axis. At minimum, four axes should be considered together.
| Criterion | What to check |
|---|---|
| Quality | Lot-to-lot variation in particle size and surface area, COA reliability, reproducibility of sintering behavior |
| Price | Unit price per kg, minimum order quantity (MOQ), price by volume band |
| Regulatory risk | Whether subject to scandium export control, track record of obtaining licenses |
| Lead time | Standard lead time, license lead time for controlled items, domestic stock availability |
On price alone, China leads; on quality alone, Japan leads — but adding regulatory risk changes the calculation. Dual-sourcing a price-competitive Chinese line (license track) alongside a regulatory-stable Japanese, US, or Korean line is often the realistic answer. The concrete strategy is covered in Procurement Strategy Under Export Controls.
HS Classification Issue
ScSZ can be discussed under two HS classifications depending on the lens:
- 2846.90: From the scandium-compound perspective
- 2825.60: From the zirconium-oxide (zirconia) perspective
Because the rate and applicable regulations can differ by classification, it is safer to fix the classification before import. For import procedure, the classification and customs framework in the SiC Powder Import Guide for Korea is a useful reference.
Frequently Asked Questions
Why is ScSZ affected by scandium export controls?
10Sc1CeSZ contains scandium at roughly 11%. China's April 2025 Announcement No. 18 controls scandium in metal, alloy, oxide, compound, and mixture forms, so a finished ScSZ product containing scandium is also subject to case-by-case licensing when exported from China.
Is there a reason to use Japanese material despite the higher price?
Japanese suppliers such as DKKK are known for high quality and lot uniformity built on foundational technology. Given that a SOFC's performance is tied directly to the sintering behavior of the electrolyte membrane, a supplier with low lot variation can be advantageous in terms of overall yield. Price, quality, and regulatory risk have to be weighed together.
What are the advantages of a domestic supply source?
Using a Korea-based producer reduces customs procedures and foreign-exchange risk, with further advantages in lead time and communication. That said, price, quality, and volume capacity still need individual verification.
Can't we just settle on a single supplier?
You can, but it is not recommended. Because of the scandium export-control variable, single-region supply risks stopping the line on a single license delay. Splitting across a price axis and a regulatory axis, running at least two lines in parallel, is more stable.
References (Public Sources)
- Each supplier's public product catalogs and company profiles
- China Ministry of Commerce (MOFCOM) Announcement No. 18 (Apr 2025)
- Korea Customs Law Information Portal (CLIP), HS 2846.90 / 2825.60 classification
Nami Tech Solution (NTS) is a trading company specializing in global sourcing of semiconductor and energy materials. NTS supports multi-region supplier discovery for SOFC materials including ScSZ, lot-level quality verification, export-license track design, and domestic inventory buffering.
For a ScSZ supplier comparison or a dual-sourcing design, contact [email protected] or use our contact page.