scholarly journals Motion of phase boundary during antiferroelectric–ferroelectric transition in a PbZrO3 -based ceramic

2020 ◽  
Vol 4 (10) ◽  
Author(s):  
Binzhi Liu ◽  
Xinchun Tian ◽  
Lin Zhou ◽  
Xiaoli Tan
Keyword(s):  
Phase Boundary ◽  
Ferroelectric Transition

Local atomic structure of relaxor ferroelectric solids studied by pulsed neutron scattering

1994 ◽  
Vol 52 ◽  
pp. 554-555
Author(s):  
T. Egami ◽  
H. D. Rosenfeld ◽  
S. Teslic
Keyword(s):  
Neutron Scattering ◽  
Atomic Structure ◽  
Argonne National Laboratory ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Crystallographic Structure ◽  
Chemical Inhomogeneity ◽  
Distribution Analysis ◽  
Ferroelectric Transition ◽  
Pulsed Neutron

Relaxor ferroelectrics, such as Pb(Mg1/3Nb2/3)O3 (PMN) or (Pb·88La ·12)(Zr·65Ti·35)O3 (PLZT), show diffuse ferroelectric transition which depends upon frequency of the a.c. field. In spite of their wide use in various applications details of their atomic structure and the mechanism of relaxor ferroelectric transition are not sufficiently understood. While their crystallographic structure is cubic perovskite, ABO3, their thermal factors (apparent amplitude of thermal vibration) is quite large, suggesting local displacive disorder due to heterovalent ion mixing. Electron microscopy suggests nano-scale structural as well as chemical inhomogeneity.We have studied the atomic structure of these solids by pulsed neutron scattering using the atomic pair-distribution analysis. The measurements were made at the Intense Pulsed Neutron Source (IPNS) of Argonne National Laboratory. Pulsed neutrons are produced by a pulsed proton beam accelerated to 750 MeV hitting a uranium target at a rate of 30 Hz. Even after moderation by a liquid methane moderator high flux of epithermal neutrons with energies ranging up to few eV’s remain.

Quantitative component interaction

2017 ◽  
Author(s):  
Kie Zuraw
Keyword(s):  
Phase Boundary ◽  
Syntactic Structure ◽  
Component Interaction ◽  
Phonological Rule

This chapter examines the phonological rule of nasal substitution in Tagalog, specifically its rate of application in different constructions. Nasal substitution can occur whenever a prefix that ends in /ŋ/ attaches to a stem beginning with an obstruent, as in /maŋ + bigáj/ → [mamigáj] ‘to distribute’. Different prefixes trigger nasal substitution at different rates. This is similar to cases in which word-internal syntactic structure determines how and whether a phonological rule applies (e.g. Newell and Piggott 2014), but different because none of these words’ syntactic structure absolutely prevents nasal substitution, such as by placing a phase boundary between the prefix and stem. The focus of the chapter is on laying out the data, but it does suggest three possible interpretations: variable syntactic structure, a phonology directly sensitive to prefix identity, or competition between productive syntactic structure and lexicalized pronunciation.

The antiferroelectric phase boundary as a kink

1990 ◽  
Vol 110 (1) ◽  
pp. 77-83 ◽  
Author(s):  
J. Dec ◽  
V. E. Yurkevich
Keyword(s):  
Phase Boundary ◽  
Antiferroelectric Phase
Sign in / Sign up

Export Citation Format

Share Document