Standard X-ray Diffraction Powder Patterns

Potassium Zinc Decavanadate 16 Hydrate, K2Zn2Vi 0O28 -16H2O (triclinic)Powder data cards. None.Additional published patterns. None.NBS sample. The sample of potassium zincdecavanadate 16 hydrate, was obtained from H. T.Evans, Jr., U.S. Geological Survey, Washington,D.C. It was prepared from a solution of potassium metavanadate and zinc acetate in water withthe pR adjusted between 3 and 4 with acetic acid.Spectrographic analysis showed the followingmajor impurities: 0.1 to 1.0 percent sodium; 0.01to 0.1 percent silicon, and 0.001 to 0.01 percenteach of aluminum, barium, calcium, chromium,iron, magnesium, molybdenum, lead, and rubidium.The color of the sample was bright orange. Theindices of refraction could not be determinedbecause of imperfections in the crystals.The d-values of the three strongest lines are:8.18, 7.40, and 9.45 A.Structural data, Evans, Mrose, and Marvin [1],in 1955 determined that potassium zinc decavanadate 16 hydrate, has the space group Ci-Pi (No.2) and l(K2Zn2Vio(Vl6H2O) per unit cell.The density of potassium zinc decavanadatecalculated from the NBS lattice constants is2.708 g/cm3 at 25 °C.Reference[1] H. T. Evans, Jr., M. E. Mrose, and R. Marvin, Constitution of the natural and artificial decavanadates,Am. Mineralogist 40, 314 (1955).hkl010100110001TTlT01OilOil101211020200201111221220102002121211201,222151202251521102022230030112501252, 300212022031552, 330052, 123003203242,5115T3222, T13420153,452103, 331503032131513552204254213,232,132554142, 153530043, 0334T1133Internal Standard,Tungsten a ==3. 1648 ACu, 1.5405 A at 25 °CdA10.019. 458.618. 187. 407. 176.815. 955.525. 175.004. 724. 634.604.534.334. 1664. 0943. 9603. 7593.6973.6303. 5803. 5483.4873.4483.4023.3733.3333.2793.2293. 1493.0112. 9772.9512.8832.7782. 7302.6802.5952. 5692.5572. 5252.4852.4582.3892.2782. 1642. 1392. 1022.0852.0712.0652.0462. 0061.9871.9851.9641.930/232820100353756914944