Standard X-ray Diffraction Powder Patterns

Cerium Niobium Titanium Oxide (eschynite), CeNbTiO6 (orthorhombic)Powder data cards. None.Additional published patterns. Komkov [1]1959.NBS sample. The sample of cerium niobiumtitanium oxide was prepared at NBS by R. S.Roth from stoichiometric mixtures of ceriumoxide, niobium oxide, and titanium oxide. Thesample was heated first at 1300 °C for 3 hrs. andthen reheated at 1325 °C for three more hours.Spectrographic analysis showed the followingmajor impurities: 0.001 to 0.01 percent each ofaluminum, calcium, iron, magnesium, and silicon.The sample was a dark brown opaque powder.The d-values of the three strongest lines are:2.975, 3.024, and 3.106 A,Structural data. Komkov [1] in 1959 determined that cerium niobium titanium oxide has thespace group DJ£-Pmnb (No. 62) with 4(CeNbTiO 6 )per unit cell. The lattice constants reported byKomkov have been converted from kX to angstrom units for comparison with NBS values.19591963Lattice constantsKomkov [1] ____ „National Bureau ofStandards at 26°C.aA7. 567. 538bA10. 9910. 958cA5. 435. 396The density of cerium niobium titanium oxidecalculated from NBS lattice constants is 5.617g/cm3 at 26 °C.Reference[1] A. I. Komkov, Minerals of the series euxenite-polycraseand priorite-blomstrandite, Dokl. Akad. Nauk SSSR126, 641-644 (1959).hkl020Oil120101111021200121220031211131002140112041122320301240032132222051151331042400142340060312420160, 013341, 103322242123260033213431351223440252402412342043, 071162360143, 171Internal Standard,Tungsten, a = 3. 1648 ACu, 1.5405 A at 26 CdA5. 484. 8414. 4314. 3904.0753. 8473. 7733. 4273. 1063.0242. 9752. 8082. 6982. 5742. 4742. 4432. 3062. 2832. 2782. 2152. 1702. 0852.0372.0311. 9611.9331. 9221. 8851. 8621. 8521. 8271. 8131. 7831. 7751. 7501. 7441. 7121. 6671. 6431. 6141. 6061. 6001. 5791, 5561. 5531. 5511. 5451. 5281. 5261. 5031. 4831,4771. 4747245241013454368010022281077989978251926115229922474619658132217710101034744424