Miracrys

NaBi(WO₄)₂ - Sodium-bismuth tungstate

Sodium-bismuth tungstate (NaBi(WO₄)₂ or NBWO) is a scintillator material possessing very high optical quality, high density and radiation hardness. Due to these properties NBWO crystals are widely used in quantum electronics, acousto-optics and high-energy physics, in particular, in Cherenkov detecting and solid state Raman laser shifting.
 NaBi(WO₄)₂ is grown from the melt by Czochralski method. If specific qualities are required NBWO can be doped with In or other elements.

Basic properties

Structure	Tetragonal scheelite-like (a=5.30, c=11.58 angstrom)
Melting point	935 °C
Density:	7.5 g/ cm³
Wavelength of max. emission	520 nm (X-ray excitation)  495 nm (optical excitation at 77 K)
Refractive index at emission maximum	2.15
Radiation hardness	10⁷ rad
Max. crystal diameter	50 mm

Transmission

Products

NaBi(WO₄)₂ ingots and wafers

Diameter/Width	50 mm
Thickness/length	0.1-20 mm
Surface quality	As-grown, 80/50, 60/40, 40/20 per MIL-0-13830

*The optimal and most cost-effective items are those with the diameter of 30-38 mm and the thickness of 1-2 mm