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Title: Five-dimensional visualization of phase transition in BiNiO{sub 3} under high pressure

Colossal negative thermal expansion was recently discovered in BiNiO{sub 3} associated with a low density to high density phase transition under high pressure. The varying proportion of co-existing phases plays a key role in the macroscopic behavior of this material. Here, we utilize a recently developed X-ray Absorption Near Edge Spectroscopy Tomography method and resolve the mixture of high/low pressure phases as a function of pressure at tens of nanometer resolution taking advantage of the charge transfer during the transition. This five-dimensional (X, Y, Z, energy, and pressure) visualization of the phase boundary provides a high resolution method to study the interface dynamics of high/low pressure phase.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [3]
  1. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  2. Center of High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203 (China)
  3. (United States)
  4. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503 (Japan)
  5. Geological and Environmental Sciences, 450 Serra Mall, Stanford University, Stanford, California 94305 (United States)
Publication Date:
OSTI Identifier:
22280549
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; BISMUTH COMPOUNDS; DENSITY; INTERFACES; NICKELATES; PHASE TRANSFORMATIONS; PRESSURE DEPENDENCE; THERMAL EXPANSION; TOMOGRAPHY; X-RAY SPECTROSCOPY