Standard X-ray Diffraction Powder Patterns

Antimony Selenide, Sb2Se3 (orthorhombic)—ContinuedThe density of antimony selenide calculatedfrom NBS lattice constants is 5.843 g/cm3 at 25 C.Reference[1] E. Donges, tlber Selenohalogenide des dreiwertigenAntimons und Wismuts und tiber Antimon (III)-selenid, Z. anorg. Chem. 263, 280-291 (1950).Antimony Telluride, Sb2Te3 (trigonal)Powder data cards. None.Additional published patterns. None.NBS sample. The sample of antimony telluridewas obtained from Semitronics, Inc., Winchester, Mass. It was heated at 450 C overnight in an evacuated tube to sharpen the pattern.Spectrographic analysis showed the followingmajor impurities: 0.001 to 0.01 percent each ofaluminum and silicon.The sample was dark gray opaque powder.The d-values of the three strongest lines are:3.157, 2.349, and 2.130 A.Structural data. Donges [1] in 1951 showedthat antimony telluride is isomorphous withbismuth telluride, having the space group D 35d-R3m (No. 166), and 3(Sb2Te3 ) per unit hexagonalcell, or l(Sb2Te3 ) per unit rhombohedral cell.The unit cell measurements reported by Semiletov[2] have been converted from kX to angstromunits for comparison with NBS values.195119561963Lattice constantsDonges [!]_____._._-__ ___Semiletov [2]______ __National Bureau of Standards at 25 C.aA4. 254. 254. 262cA30.3529. 9230. 450The density of antimony telluride claculatedfrom NBS lattice constants is 6.513 g/cm3 at 25 C.References[1] E. Donges, Uber Chalkogenohalogenide des dreiwertigen Antimons und Wismuts. III. t)ber Tellurohalogenidedes dreiwertigen Antimons und Wismutsund liber Antimon und Wismut (III) Tellurid undWismut (III) Selenid, Z. anorg. u. Allgem, Chem.265, 56-61 (1951).[2] S. A. Semiletov, Electronographic determination ofantimony telluride structure, Kristallografiya 1,403-406 (1956).8hkl(hex.)0030060091040151070181-0-100*1*111100-0-151-0-131160-1*141192050-0-182080-1-170-2-102-0-111-0-19, 1-1-150-0-210-1-201251-1-180-0-24,2-1-100-1-233000-2-191-1-212-0-20, 1-2-141*0-252-1-162-0-232202-1-191-0-281-2*200-2-250-1-293-0-181-3-102-2-15Internal Standard, 0Tungsten, a = 3. 1648 ACu, 1.5405 A at 25 CdA10. 165.083.3833.3213. 1572. 8152. 6512. 3492. 2152. 1302.0301. 9771.9641. 8751. 8041.7661. 6921. 6611. 6111. 5781. 5371.4701.4501.4081. 35971. 32491. 26831. 24621. 23031. 21021. 19881. 17421. 15631. 12521. 07591. 06551. 05221. 04311. 02861. 01671, 00960. 9952.9704.9434'1351100