Add to Cart Ta2NiS5 Crystal Tantalum Nickel Sulfide MSRP: Now: $640.00 Was: Ta2NiS5 is a narrow gap semiconductor (Eg~0.39 eV) with suspected exciton insulator behavior like observed in its sister compound Ta2NiSe5. Excitonic insulators are novel material systems... BLK-Ta2NiS5 MSRP: Now: $640.00 Was: Add to Cart Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $640.00 Was: Subtotal: Add to Cart