Standard X-ray Diffraction Powder Patterns

Ammonium Fluoberyllate, (NH4) 2BeF4 (orthorhombic)Powder data cardsCardnumber3-0885Indexlines2.482.274.31SourceThe Dow Chemical Co.Additional published patterns. None.NBS sample. The sample of ammonium fluoberyllate was obtained from K and K Laboratories,Jamaica, Long Island, N.Y. Spectrographic analysis showed the following major impurities: 0.001to 0.01 percent each of aluminum, calcium, andsilicon.The sample was colorless, and optically negativewith Na =1.397, N0=1.401, and N7 = 1.403.The ^-values of the three strongest lines are:4.275, 2.478, and 4.312 A.Structural data. Hultgren [1] in 1934 determined that ammonium fluoberyllate belongs tothe space group D^-Pnam (No. 62) with4[(NH4 )2-BeF4] per unit cell. The lattice constants ofMukherjee [2] have been converted from kX toangstrom units for comparison with the NBSvalues.193419451963Hultgren [!]___ _Mukherjee [2]_ _ ...National Bureauof Standards at25 C.Lattice constantsaA7. 57. 517. 645.001bA10. 210. 4110. 450.001cA5.85.905.929.001The density of ammonium fluoberyllate calculated from NBS lattice constants in 1.698 g/cm3at 25 C.Referenceshkl020Oil120111200201220031002131112040230310122231202320311132321, 222330241051013, 331400410250401322411,420251341033160133350402233252, 351510323004Internal Standard,Tungsten, a =3. 1648 ACu, 1.5405 A at 25 CdA5. 2295. 1574. 3124. 2753. 8213. 2123. 0853. 0032. 9622. 7942. 6712. 6122.5752. 4782. 4432.3622. 3422. 2892. 2842. 1642. 1362. 0562.0271. 9701. 9421. 9111. 8791. 83391. 81921. 81241. 79341. 75261. 75521. 71931. 69771. 67651. 61681. 60701. 56681. 55981. 51241. 49631. 4821/5159010036