| 000 | 02252 am a22002173u 4500 | ||
|---|---|---|---|
| 042 | _adc | ||
| 100 | 1 | 0 |
_aRoth, R. S. _eauthor _9292 |
| 700 | 1 | 0 |
_aWaring, J. L. _eauthor _9293 |
| 245 | 0 | 0 | _aPhase Equilibrium Relations in the Binary System Bismuth Sesquioxide-Niobium Pentoxide |
| 260 |
_b[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology, _c1962. |
||
| 500 | _a/pmc/articles/PMC5324962/ | ||
| 520 | _aThe phase equilibrium diagram for the binary system bismuth sesquioxide-niobium pentoxide has been constructed from observations of fusion characteristics and X-ray diffraction data. In the system five binary compounds were observed with Bi(2)O(3):Nb(2)O(5) ratios of 5:3, 1:1, 4:9, 1:5, and 1:6. The 1:1 compound was found to transform irreversibly (in laboratory time) from the orthorhombic bismutotantalite type structure to a triclinic form at about 1,020 °C and melt congruently at 1,245 °C. The 5:3 compound melts incongruently at 1,193 °C the 4:9 at 1,183 °C and the 1:6 at 1,242 °C. The 1:5 compound has a maximum temperature of stability at 1,095 °C and the 4:9 and 1:6 compounds have minimum temperatures of stability at 1,070 °C and 1,002 °C respectively. Nb(2)O(5) was found to enter into solid solution in Bi(2)O(3), up to about 23.5 mole percent Nb(2)O(5). The melting point is increased and the monoclinic-cubic phase transformation temperature is decreased. A morphotropic phase change occurrs at about 19.5 mole percent Nb(2)O(5) from the cubic to a pseudocubic structure. | ||
| 540 | _a | ||
| 540 | _ahttps://creativecommons.org/publicdomain/zero/1.0/ | ||
| 540 | _aThe Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright. | ||
| 546 | _aen | ||
| 690 | _aArticle | ||
| 655 | 7 |
_aText _2local |
|
| 786 | 0 | _nJ Res Natl Bur Stand A Phys Chem | |
| 856 | 4 | 1 |
_uhttp://dx.doi.org/10.6028/jres.066A.046 _zConnect to this object online. |
| 999 |
_c1227 _d1227 |
||