文献类型： 会议论文

第一作者： Wen-Ming Chien

作者： Wen-Ming Chien ¹ ; Dhanesh Chandra ¹ ; Jennifer Franklin ¹ ; Claudia J. Rawn ² ; Abdel K. Helmy ³ ;

作者机构： 1.Metallurgical and Materials Engineering, University of Nevada, Reno, Reno, Nevada 89557

2.Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831-6064

3.Special Devices Inc., 14370 White Sage Road, Moorpark, CA 93021

会议名称： Conference on applications of X-ray analysis

主办单位：

页码： 39-44

摘要： The solid-state phase transitions of the KNO_3-NH_4NO_3 solid solutions have been determined by high temperature X-ray diffractometry, and lattice parameter calculation has also been performed. Ammonium nitrate (AN) is of great use for gas generators of automobile air bag systems. The X-ray diffraction results showed the single (AN) phase III from 5% to 20% KNO_3 in NH_4NO_3 and up to 373 K, which is the important temperature range for the air bag gas generator applications. The X-ray diffraction patterns of the low temperature KNO_3 phase (KN II) are from 92%-100% KNO_3 composition range and up to 393 K temperature. The high temperature KNO_3 phase (KN I) showed very broad composition range from 20% up to 100% KNO_3 at various temperature ranges. The lattice parameters of the NH_4NO_3-rich (AN III) and KNO_3-rich (KN II and KN I) solid solutions have been calculated at different temperature range. The volumes of AN III phase decrease from 0.3201(4) to 0.3166(1) nm~3 at the room temperature and from 0.3250(6) to 0.3215(3) nm~3 at 373 K as the compositions increase from 5% to 20%KNO_3. The lattice constants of the hexagonal KN I phase show that there is no significant change in a-direction when the temperature increases. Details of X-ray results, lattice expansions and equations during heating are presented.

分类号： O657