Theory of the Transition in KH2PO4

凝聚态物理 相变 过渡点 铁学 Crystal(编程语言) 居里温度 过渡态理论 极化(电化学) 偶极子 化学 物理 结晶学 材料科学 热力学 量子相变 量子临界点 量子力学 铁磁性 物理化学 计算机科学 反应速率常数 动力学 程序设计语言
作者
J. C. Slater
出处
期刊:Journal of Chemical Physics [American Institute of Physics]
卷期号:9 (1): 16-33 被引量:628
标识
DOI:10.1063/1.1750821
摘要

Potassium dihydrogen phosphate contains phosphate groups connected by hydrogen bonds. Different possible arrangements of the hydrogens result effectively in different orientations of the (H2PO4)— dipoles. Since these have the lowest energy when pointing along the axis of the crystal, there is a tendency toward spontaneous polarization along this axis, resulting in the well-known transition, similar to Rochelle salt, with polarization below the Curie point. The theory of this transition is worked out, using statistical methods to count the number of arrangements of hydrogens consistent with each total polarization of the crystal, and deriving the free energy. It is found that the theory predicts a phase change of the first order, with sudden transition from the polarized state at low temperature to the unpolarized state at high temperature, rather than the lambda-point transition or phase change of the second order which is observed. However, the observed transition is confined to a very narrow temperature range compared to that predicted, for instance, by the Weiss theory, so that it seems as if it might be merely a broadened transition of the first order. It is suggested that the broadening may result from the irregular shifts of transition temperatures of individual domains in the crystal on account of stresses resulting from the large piezoelectric effect and the resulting deformation of the crystal below the transition point. The susceptibility above the Curie point comes out by the theory to be 4.33 times as great as it should according to the Weiss theory, a result which seems to be in general agreement with experiment. The entropy change in the transition is given by the theory as 0.69 unit, somewhat smaller than the observed value of about 0.8 unit. No explanation is suggested for this discrepancy.
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
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

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
master-f完成签到 ,获得积分10
1秒前
1秒前
652183758完成签到 ,获得积分10
3秒前
sailingluwl完成签到,获得积分10
3秒前
端庄半凡完成签到 ,获得积分10
8秒前
权小夏完成签到 ,获得积分10
16秒前
study00122完成签到,获得积分10
17秒前
CC完成签到,获得积分10
18秒前
苗苗043完成签到 ,获得积分10
21秒前
您好刘皇叔完成签到,获得积分0
25秒前
Wu完成签到 ,获得积分10
26秒前
34秒前
serenity711完成签到 ,获得积分10
34秒前
优雅莞完成签到,获得积分10
34秒前
37秒前
CrsCrsCrs完成签到,获得积分10
38秒前
高速旋转老沁完成签到 ,获得积分10
40秒前
舒心威发布了新的文献求助10
41秒前
juice完成签到 ,获得积分10
47秒前
哎呀完成签到 ,获得积分10
48秒前
哭泣的缘郡完成签到 ,获得积分10
51秒前
51秒前
舒心威完成签到,获得积分10
55秒前
Bryan应助科研通管家采纳,获得10
57秒前
Bryan应助科研通管家采纳,获得10
57秒前
天天快乐应助阿宛采纳,获得10
58秒前
Nick爱学习发布了新的文献求助10
58秒前
冷傲菠萝完成签到 ,获得积分10
58秒前
四月完成签到 ,获得积分10
59秒前
广阔天地完成签到 ,获得积分10
1分钟前
笨笨青筠完成签到 ,获得积分10
1分钟前
KLED完成签到 ,获得积分10
1分钟前
zoe完成签到 ,获得积分10
1分钟前
Nick爱学习完成签到,获得积分10
1分钟前
cistronic完成签到,获得积分10
1分钟前
青子完成签到,获得积分10
1分钟前
ljy2015完成签到 ,获得积分10
1分钟前
蔡翌文完成签到 ,获得积分10
1分钟前
阿柴_Htao完成签到 ,获得积分10
1分钟前
gyx完成签到 ,获得积分10
1分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Social Research Methods (4th Edition) by Maggie Walter (2019) 2390
A new approach to the extrapolation of accelerated life test data 1000
Problems of point-blast theory 400
北师大毕业论文 基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 390
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4001381
求助须知:如何正确求助?哪些是违规求助? 3540765
关于积分的说明 11278689
捐赠科研通 3278680
什么是DOI,文献DOI怎么找? 1808154
邀请新用户注册赠送积分活动 884376
科研通“疑难数据库(出版商)”最低求助积分说明 810291