Colossal Thermal Expansion in Ca-Substituted PbCrO<sub>3</sub>

Colossal thermal expansion, 11.9% volume expansion on heating, was observed in Pb0.7Ca0.3CrO3. The parent compound, PbCrO3, had been known to have a characteristic Pb2+0.5Pb4+0.5Cr3+O3 charge distribution with a glassy distribution of Pb2+ and Pb4+ in ambient conditions and undergoes a charge transfer transition to the Pb2+Cr4+O3 high-pressure phase at 2.5 GPa. It decomposes at 720 K without such a transition when heated at ambient pressure. Our in-situ synchrotron X-ray diffraction study revealed a temperature-induced phase transition from Pb2+Cr4+O3 to Pb2+0.5Pb4+0.5Cr3+O3 at moderate pressures between 2 and 3.5 GPa. Ca substitution for Pb shifted the phase boundary in the pressure–temperature space, and essentially the same charge transfer transition was caused by heating at ambient pressure. A remarkable volume change of 11.9% occurred, corresponding to a colossal linear thermal expansion coefficient of 550 ppm/K─an unprecedented value in oxide ceramics.

Authors

Institutions

Publication Details

Journal
Chemistry of Materials
Published
2025-03-12
DOI
https://doi.org/10.1021/acs.chemmater.5c00090
Citations
2
Primary Topic
Thermal Expansion and Ionic Conductivity
Type
article
Field-Weighted Citation Impact
1.04

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Colossal Thermal Expansion in Ca-Substituted PbCrO3

Runze Yu, Takafumi Yamamoto, Yuki Sakai, Takumi Nishikubo et al.
2 citations
Chemistry of Materials
Thermal Expansion and Ionic Conductivity
1.04
article

Colossal Thermal Expansion in Ca-Substituted PbCrO3

Runze Yu, Takafumi Yamamoto, Yuki Sakai, Takumi Nishikubo, Teppei Nagase, Koji Matsushima, Ken Hatayama, Qiumin Liu, Jun Miyake, Masaki Azuma, Kazuki Takahashi, Yusuke Shibata, S Higashi
article en
2 citations

Abstract

Colossal thermal expansion, 11.9% volume expansion on heating, was observed in Pb0.7Ca0.3CrO3. The parent compound, PbCrO3, had been known to have a characteristic Pb2+0.5Pb4+0.5Cr3+O3 charge distribution with a glassy distribution of Pb2+ and Pb4+ in ambient conditions and undergoes a charge transfer transition to the Pb2+Cr4+O3 high-pressure phase at 2.5 GPa. It decomposes at 720 K without such a transition when heated at ambient pressure. Our in-situ synchrotron X-ray diffraction study revealed a temperature-induced phase transition from Pb2+Cr4+O3 to Pb2+0.5Pb4+0.5Cr3+O3 at moderate pressures between 2 and 3.5 GPa. Ca substitution for Pb shifted the phase boundary in the pressure–temperature space, and essentially the same charge transfer transition was caused by heating at ambient pressure. A remarkable volume change of 11.9% occurred, corresponding to a colossal linear thermal expansion coefficient of 550 ppm/K─an unprecedented value in oxide ceramics.

Chemistry of MaterialsVol. 37(9)
Center for High Pressure Science and Technology Advanced Research (CN), Kanagawa Industrial Technology Center (JP)
Kanagawa Institute of Industrial Science and Technology, Japan Society for the Promotion of Science, Core Research for Evolutional Science and Technology
Affordable and clean energy
Openalex Percentile: Top 27%
Thermal Expansion and Ionic Conductivity
1.04
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.