A Raman scattering study of the isotope effect in (NH4)(2)PbCl6

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	A Raman scattering study of the isotope effect in (NH4)(2)PbCl6
	J. R. Shi; Y. Kume; B. Arnscheidt; Y. C. Xu; X. Wu; J. Pelzl
	1996
发表期刊	Journal of Physics-Condensed Matter
ISSN	0953-8984
卷号	8 期号:28 页码:5247-5252
摘要	Raman spectra of (NH4)(2)PbCl6 and (ND4)(2)PbCl6 crystals have been recorded in the temperature range 5 K-300 K. (NH4)(2)PbCl6 undergoes only one structural phase transition at T-c1 = 78 K from a cubic (O-h(5)) to a trigonal structure (C-3i(2)), whereas (ND4)(2)PbCl6 undergoes structural phase transitions from a cubic (O-h(5)) to a trigonal structure (C-3i(2)) at T-c1 = 79 K, and to a monoclinic or orthorhombic structure at T-c2 = 34 K. Continuous changes of the Raman-active modes at T-c1 in both compounds show that the structural transition from cubic to trigonal is one of second order and results from distortions with symmetry related to the T-1g irreducible representation at the Gamma point. Discontinuous behaviours of the Raman modes at T-c2 in (ND4)(2)PbCl6 show that the second structural transition is one of first order.
部门归属	azabu univ,fac gen educ,sagamihara,kanagawa 229,japan. ruhr univ bochum,ag festkorperspektroskopie,inst exptl phys 3,d-44780 bochum,germany. ccast,world lab,ctr theoret phys,beijing 100080,peoples r china. acad sinica,int ctr mat phys,shenyang 110015,peoples r china.;shi, jr (reprint author), tongji univ,pohl inst solid state phys,shanghai 200092,peoples r china
关键词	Ammonium Hexachlorotellurate Phase-transitions Thermodynamic Properties Deuterated (Nh4)2tecl6 Heat-capacity (Nh4)2pbcl6 Temperatures Ion Nmr
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38392
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. R. Shi,Y. Kume,B. Arnscheidt,et al. A Raman scattering study of the isotope effect in (NH4)(2)PbCl6[J]. Journal of Physics-Condensed Matter,1996,8(28):5247-5252.
APA	J. R. Shi,Y. Kume,B. Arnscheidt,Y. C. Xu,X. Wu,&J. Pelzl.(1996).A Raman scattering study of the isotope effect in (NH4)(2)PbCl6.Journal of Physics-Condensed Matter,8(28),5247-5252.
MLA	J. R. Shi,et al."A Raman scattering study of the isotope effect in (NH4)(2)PbCl6".Journal of Physics-Condensed Matter 8.28(1996):5247-5252.