Standard X-ray Diffraction Powder Patterns

Strontium 1:1 Berate, SrO-B2O3 (orthorhombic)Powdet data cards* None.Additional published patterns. None.NBS sample. The sample of strontium 1:1borate was prepared at NBS by C. E. Weir.A suspension of hydrogen 3:1 borate (boric acid)and strontium carbonate was evaporated to drynessand heated at 1000 °C. Spectrographucanalysis showed the following major impurities:0.01 to 0.1 percent each of barium and silicon;0.001 to 0.01 percent each of calcium and sodium.The sample is colorless and optically negativewith Na= 1.632, N^ 1.650, and N 7= 1.660.The d-values of the three strongest lines are:3.467, 6.013, and 2.688 A.Structural data. Block, Perloff, and Weir [1]in 1963 determined that strontium 1:1 boratehas the space group D^-Pnca (No. 60) and4(SrO-B2O3) per unit cell.19631963Block, Perloffand Weir [1].National Bureauof Standardsat 25 °C.Lattice constantsaA6.5776. 5890±.0004bA12. 0212. 018±.001c0A4. 3294. 3373± . 0005The density of strontium 1:1 borate calculatedfrom the NBS lattice constants is 3.350 g/cm3 at25 °C.Reference[1] S. Block, A. Perloff, and C. E. Weir. The crystallography of some M+2 borates, Acta Cryst. 17, 314(1964).hkl020111200210121040220131141240002022060, 151241122311202212331222260400420171, 242430351080062440113280262133371422460511153531282, 3332-10-05514803916001736201-11-16405712-10-2482, 373Internal Standard,Silver, a =4.0861 ACu, 1.5405 A at 25 Cd0A6. 0133. 4673. 2923. 1763. 1013. 0042. 8882. 6882.3132. 2212. 1692.0412. 0031. 9771. 9481. 9341. 8121. 792L 7601. 7341. 7121. 6471. 5891. 55181. 52321. 51921. 50231. 47121. 44471. 40201. 36671. 34341. 33201. 29111. 28201. 27241. 25431. 21741. 2027L 15641. 12911. 11651. 11001. 10361. 09801. 09061. 08041. 04611. 03131. 01611. 00130. 98791/J69100374715374067530272158974484231410