Abstract
A new niobate Sr 6CrNb 9O 30 was found in the ternary system SrOCr 2O 3Nb 2O 5. The transparent crystal which has a green color and a need-like shape can be grown by the flux method. The crystal structure was determined by x-ray diffraction analysis and dielectric measurement, and it belongs to the orthorhombic tungsten bronze structure at room temperature with space group Cmm2, and unit cell parameters a=1.7505(4) nm, b=1.7510(1) nm, c=7.768(4)nm, Z=4. Dielectric constant measurement show that Sr 6CrNb 9O 30 has two phase transitions, paraelectric to ferroelectric at 110°C and ferroelectric to ferroelastic at 205°C.
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