DIELECTRIC PHASE TRANSITION IN SOFT-HARD HYDROGEN BONDS MIXTURE SYSTEM

软硬氢键混合体系中的介电相变

• 批准号: 12640303
• 负责人: KASAHARA Masaru
• 金额: $ 2.43万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640303/
• 关键词: HYDROGEN BOND; ZERO-DIMENSIONAL HYDROGEN-BONDED SYSTEM; ISOTOPE EFFECT; QUANTUM FLUCTUATION; STRONTIUM TITANATE; 量子揺ぎ; SrTiO_3; 酸素同位体置換; 重水素置換; 強誘電相転移; ラマン散乱; ラマン線幅尖鋭化

At the time of the application to this project, we had already found that the hydrogen bonds containing hydrogen and that contain deuterium show the different behavior against the mixing rate of hydrogen salt and its deuterated analogue. In order to reveal if this anomaly is general phenomenon, we have studied1. if the similar phenomena is found in other material,2. quantum fluctuations in strontium titanate because this phenomenon is inferred to associate with quantum fluctuations and strontium titanate is considered to be influenced by them.About 1, we try to find a similar phenomenon in ethanol but unfortunately we could not find it. Thus, we are now studying in the zero-dimensional hydrogen-bond system and found a similar phenomenon. This concludes that H-hydrogeh bond behaves differently from D-hydrogen bond against the mixing rate of H/D, at least, in zero-dimensional hydrogen bond system.About 2, strontium titanate in which oxygen are replaced with mass 18 oxygen is found by Itoh et al. to show the ferroelectric phase transition. Our study revealed that this phase transition is due to the freezing of the soft mode and quantum fluctuation have influence on this phase transition.In the hydrogen bond system, however, it is unclear how quantum fluctuations affect the dynamics of hydrogens or deuterons. Further study is needed.

在该项目应用时，我们已经发现含有氢的氢键和含氘的氢键显示出针对氢盐混合速率及其氘化的类似物的不同行为。为了揭示这种异常是否是普遍现象，我们已经研究了1。如果在其他材料中发现了类似现象，则2。由于推断出这种现象与量子波动相关，并且认为钛酸腹膜是受其影响的。因此，我们现在正在零维氢键系统中进行研究，并发现了类似的现象。这得出的结论是，H-HydroGEH键的行为与D-氢键相对于H/D的混合速率至少在零维氢键系统中的混合速率不同。在2，钛酸中，钛含氧氧气被Itoh等人发现，其中氧气被质量18的氧气代替。显示铁电相变。我们的研究表明，这种相变是由于软模式的冻结和量子波动对这种相变的影响。但是，在氢键系统中，尚不清楚量子波动如何影响氢元或杜特龙的动力学。需要进一步研究。

项目成果

M. KASAHARA: "RAMAN SCATTERING STUDY OF SrTi^<18>O_3"J. PHYS. SOC. JPN.. 70-3. 648-651 (2001)

M. KASAHARA：“SrTi^<18>O_3 的拉曼散射研究”J。

M. Kasahara: "Soft Mode of SrTi^<18>O_<3x>^<16>O_<3(x-1)> Studied by Raman Scattering"J. Phys. Soc. Jpn.. 71-5(in print). (2002)

M. Kasahara：“通过拉曼散射研究 SrTi^<18>O_<3x>^<16>O_<3(x-1)> 的软模式”J。

M. Kasahara: "Phase Transition of SrTiO_3 Studied with Raman Scattering"Proc. of 10^<th> International Meeting on Ferroelectricity, Ferroelectrics. (in print).

M. Kasahara：“用拉曼散射研究 SrTiO_3 的相变”Proc。

M. KASAHARA: "SOFT MODE OF SrTi^<18>0_<3x>^<16>O_<3(1-x)> STUDIED BY RAMAN SCATTERING"J. PHYS. SOC. JPN.. 71-5(lN PRINT). (2002)

M. KASAHARA：“通过拉曼散射研究 SrTi^<18>0_<3x>^<16>O_<3(1-x)> 的软模式”J。

M.Kasahara: "Soft Mode of SrTi^<18>O_<3x>^<16>O_<3(1-x)> Studied by Raman Scattering"J. Phys. Soc. Jpn.. (in print). (2002)

M.Kasahara：“通过拉曼散射研究SrTi^<18>O_<3x>^<16>O_<3(1-x)>的软模式”J。