Lattice-stiffening transition in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)

被引：34

作者：

Borca, CN

Adenwalla, S

Choi, JW

Sprunger, PT

Ducharme, S

Robertson, L

Palto, SP

Liu, JL

Poulsen, M

Fridkin, VM

You, H

Dowben, PA ^{[1
]}

机构：

[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[2] Univ Nebraska, Ctr Mat Res & Anal, Lincoln, NE 68588 USA

[3] Louisiana State Univ, Ctr Adv Microstruct & Devices, Baton Rouge, LA 70806 USA

[4] Oak Ridge Natl Lab, High Flux Isotope Reactor, Oak Ridge, TN 37831 USA

[5] Russian Acad Sci, Inst Cristallog, Moscow 117333, Russia

[6] Argonne Natl Lab, Mat Sci Div 223, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.83.4562

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the discovery of a compressibility phase transition at 160 K in crystalline copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%). This phase transition is distinct from the known bulk ferroelectric-paraelectric phase transition at 353 It and surface ferroelectric phase transition at 295 K. The new phase transition is characterized by an increase in the effective Debye temperature from 48 to 245 K along the [010] direction as the temperature falls below 160 K. This phase transition is evident in neutron scattering, x-ray diffraction, angle-resolved photoemission, and in the dipole active phonon modes in electron energy-loss spectroscopy.

引用

页码：4562 / 4565

页数：4

共 29 条

[1] SURFACE PHOTOVOLTAGE EFFECTS IN PHOTOEMISSION FROM METAL-GAP(110) INTERFACES - IMPORTANCE FOR BAND-BENDING EVALUATION [J].