Standard X-Ray Diffraction Powder Patterns of Fifteen Ceramic Phases

Abstract

The following fifteen reference patterns of boride, silicide and oxide ceramics represent the first group of ceramic phases measured at the National Bureau of Standards under the project “High Quality Reference Patterns and Total Digital Powder Patterns of Technologically Important Ceramic Phases”. The support and interest of the JCPDS-ICDD in this project is gratefully acknowledged.The general methods of producing these X-ray powder diffraction reference patterns are described in this journal, Vol. 1, No. 1, pg. 40(1986).

Crystal Structure Refinement of MgNb2O6Columbite from Neutron Powder Diffraction Data and Study of the Ternary System MgO–Nb2O5–NbO, with Evidence of Formation of New Reduced Pseudobrookite Mg5−xNb4+xO15−δ(1.14≤x≤1.60) Phases

“…The phase diagram of the binary system MgO-Nb O was first reported by Tilloca and Pe´rez y Jorba (6) and later confirmed by Abbattista et al (7) and Bru¨ck et al (8) Mg Nb O shows a crystal structure derived from the ordering of Mg> and Nb> ions in the corundum-type ( -Al O ) structure (9,10). For Mg Nb O , only phase equilibria and X-ray powder diffraction data are available in the literature (7,8,11).…”

Electronic structure of Ge3N4 possible structures

“…This material was later on identified to have the phenacite hexagonal structure (β-Ge 3 N 4 ) [20,21] with the following lattice parameters [21]: a = 8.032 Å and c = 8.078 Å. Much experimental work has been devoted to synthesize Ge 3 N 4 by different techniques [22 -33].…”

“…There is also a rhombic structure attributed to Ge 3 N 4 with the following lattice parameters: a = 13.84 Å, b = 9.06 Å, and c = 8.18 Å [34]. β-Ge 3 N 4 has a density of 5.287 g/cm 3 [21] and refractive index of 2.1 [23,24]. It has been experimentally shown that Ge 3 N 4 is a good candidate for applications in photodiodes, optic fibers, protective coatings, etc.…”

Experimental study of the phase relations in the Co–Si–Zn ternary system at 723 and 873 K

“…There is only a eutectic reaction at the temperature close to the melting point of Zn (419.2°C) [15]. The crystallographic data of the binary compounds in the Co-Si-Zn ternary system at 723 and 873 K are summarized in Table 1 [16][17][18][19][20][21][22][23][24]. The crystal Structure of b 1 -CoZn were investigated by Lihl and Weisberg [16] and Buschow et al [17].…”