Standard X-Ray Diffraction Powder Patterns from the JCPDS Research Associateship

Abstract

The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods of producing these reference patterns are described in this journal, Vol. 1, No. 1, p. 40 (1986).The data for each phase apply to the specific sample described. A sample was mixed with 1 or 2 internal standards: silicon (SRM640a), silver, tungsten, or fluorophlogopite (SRM675). Expected 2-theta values for these standards are specified in the methods described (ibid.). Data from which the reported 2-theta values were determined, were measured with a computer controlled diffractometer. Computer programs were used to locate peak positions and calibrate the patterns as well as to perform variable indexing and least squares cell refinement. A check on the overall internal consistency of the data was also provided by a computer program.

Electrical and optical properties of Zn–In–Sn–O transparent conducting thin films

“…Table 2: Resistivity, mobility and carrier concentration of the as-deposited samples. [23] and ZnO wurtzite (001) peak at 34.4º [24]. …”

“…These peaks can be interpreted as the (111) peak of In 2 O 3 byxbyite structure referenced at 30.6º [23] changing gradually to ZnO (001) wurtzite peak referenced at 34.4º [24]. It suggested that some short range order could be present in the film structure.…”

Structural characterization of impurified zinc oxide thin films

“…The precursors were grinded, mixed and then calcined as described earlier in deposition section. From the x-ray diffractogram shown in Fig.1 two phases are identified in the calcined mixed powder: the wurtzite zinc oxide phase indexed according to ICDD pattern 00-036-1451 [34] and the base-centered monoclinic europium oxide indexed according to ICDD pattern 00-034-0072; the two phases also remain in the sintered target. The raw europium oxide powder with a body-centered cubic crystalline structure (indexed using the ICDD pattern 00-034-0392) undergo an irreversible phase transition to the monoclinic aforementioned crystal system when it is calcined above 1075 • C [35].…”

Improved Synthesis of Alkali Metal Vanadates Using a Hydrothermal Method

“…Most trivanadates have been prepared at high temperature by ceramic synthesis routes [3][4][7][8][9][12][13][14] with difficulty in controlling the composition of the mixed-valence vanadium compounds as in the synthesis of K2(V 4+ O)V 5+ 2O7. Galy and Carpy [4] obtained the single crystal product from solid state reaction of the K2O-V2O5-VO2 system.…”

“…Finally, single crystals were prepared by cooling of VO2 in molten KVO3 flux in a platinum crucible sealed inside a silica container [9]. The mixed-cation pyrovanadate, K2ZnV2O7, was made by heating a 1:1:1 molar mixture of K2CO3, ZnO, and V2O5 at 550 C overnight, regrinding and heating again at 550 C for 2 days [12].…”