Phase transitions and ionic motions in ammonium potassium hexafluoroaluminates(III) with compositions of (NH4)3−xKx[AlF6] (x = 1,2) as studied by 1H, 19F, and 27Al nuclear magnetic resonance

离子键合 核磁共振 化学 离子 相(物质) 物理 有机化学
作者
Kiyofumi Hirokawa,Yoshihiro Furukawa
出处
期刊:Journal of Physics and Chemistry of Solids [Elsevier]
卷期号:49 (9): 1047-1056 被引量:14
标识
DOI:10.1016/0022-3697(88)90152-7
摘要

Abstract Phase transitions and ionic motions in ammonium potassium hexafluoroaluminates (III) with compositions of (NH4)3−xKx[AlF6] (x = 1,2) were characterized by means of differential thermal analysis (DTA) and NMR of 1H, 19F, and 27Al nuclei. It was found by powder X-ray diffraction that the x = 2 composition ( a = 8.64 2 A ) as well as the x = 1 composition crystallize in a face-centered cubic structure at room temperature. From DTA experiments, phase transitions were located at 250 and 186 K for the x = 1 composition and at 170 K for the x = 2 composition. The temperature dependences of the spin-lattice relaxation times T1 of 1H, 19F, and 27Al NMR were well interpreted in terms of overall reorientations of NH+4 and [AlF6]3− ions. The phase transition mechanisms are briefly discussed in relation to the crystal structures and the molecular motions of the NH4+ and [AlF6]3− ions. Preliminary results of DTA and powder X-ray diffraction are reported for several nonstoichiometric compositions of (NH4)3−xKx[AlF6](0
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
花纸鸳完成签到,获得积分10
刚刚
脑洞疼应助zyy采纳,获得10
1秒前
1秒前
毛爱民发布了新的文献求助10
2秒前
可爱的函函应助小毛采纳,获得10
2秒前
充电宝应助夏夏采纳,获得10
2秒前
砍柴少年发布了新的文献求助10
3秒前
可爱的函函应助wa采纳,获得10
3秒前
能干冰露完成签到,获得积分10
3秒前
niu完成签到 ,获得积分10
4秒前
111发布了新的文献求助10
4秒前
5秒前
青萝发布了新的文献求助10
6秒前
ani完成签到,获得积分10
6秒前
超级尔白发布了新的文献求助10
7秒前
7秒前
丘比特应助pufanlg采纳,获得10
7秒前
7秒前
7秒前
勤劳寒烟完成签到,获得积分10
7秒前
8秒前
zzzzz发布了新的文献求助10
8秒前
漂亮的素完成签到,获得积分20
9秒前
9秒前
陈晓真发布了新的文献求助10
10秒前
10秒前
10秒前
烟花应助pearlwh1227采纳,获得20
10秒前
pp完成签到,获得积分10
10秒前
11发布了新的文献求助10
11秒前
华仔应助lambo采纳,获得10
11秒前
11秒前
小黄发布了新的文献求助10
12秒前
12秒前
pp发布了新的文献求助10
13秒前
丘比特应助砍柴少年采纳,获得10
14秒前
漂亮的素发布了新的文献求助10
14秒前
14秒前
zhuzihao完成签到,获得积分20
14秒前
14秒前
高分求助中
Production Logging: Theoretical and Interpretive Elements 2700
Mechanistic Modeling of Gas-Liquid Two-Phase Flow in Pipes 2500
Kelsen’s Legacy: Legal Normativity, International Law and Democracy 1000
Handbook on Inequality and Social Capital 800
Conference Record, IAS Annual Meeting 1977 610
Interest Rate Modeling. Volume 3: Products and Risk Management 600
Interest Rate Modeling. Volume 2: Term Structure Models 600
热门求助领域 (近24小时)
化学 材料科学 生物 医学 工程类 有机化学 生物化学 物理 纳米技术 计算机科学 内科学 化学工程 复合材料 基因 遗传学 物理化学 催化作用 量子力学 光电子学 冶金
热门帖子
关注 科研通微信公众号,转发送积分 3546764
求助须知:如何正确求助?哪些是违规求助? 3123808
关于积分的说明 9356884
捐赠科研通 2822427
什么是DOI,文献DOI怎么找? 1551441
邀请新用户注册赠送积分活动 723417
科研通“疑难数据库(出版商)”最低求助积分说明 713756