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@ARTICLE{Murphy:837116,
author = {Murphy, Gabriel L. and Kennedy, Brendan J. and Zhang,
Zhaoming and Avdeev, Maxim and Brand, Helen E. A. and
Kegler, Philip and Alekseev, Evgeny},
title = {{S}tructure and phase transition in {B}a{T}h{O} 3 : {A}
combined neutron and synchrotron {X}-ray diffraction study},
journal = {Journal of alloys and compounds},
volume = {727},
issn = {0925-8388},
address = {Lausanne},
publisher = {Elsevier},
reportid = {FZJ-2017-06105},
pages = {1044-1049},
year = {2017},
abstract = {The structure of BaThO3, obtained by solid state synthesis,
was refined for the first time by the Rietveld method using
a combination of synchrotron X-ray and neutron powder
diffraction data. BaThO3 has an orthorhombic structure at
room temperature, in space group Pbnm with a = 6.3491(5), b
= 6.3796(4) and c = 8.9907(7) Å. Heating BaThO3 to above
700 °C results in a continuous transition to a second
orthorhombic structure, in space group Ibmm, demonstrated by
both in situ neutron and synchrotron X-ray powder
diffraction measurements. The coefficient of volumetric
thermal expansion for BaThO3 is determined to be 1.04 ×
10−5 °C-1 from 50 to 625 °C (Pbnm phase), and 9.43 ×
10−6 °C-1 from 800 to 1000 °C (Ibmm phase). BaThO3 was
found to decompose upon exposure to atmospheric moisture
resulting in the formation of ThO2. The thermal expansion of
ThO2, which invariably co-exists with BaThO3, is also
described.},
cin = {IEK-6},
ddc = {670},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {161 - Nuclear Waste Management (POF3-161) / Helmholtz Young
Investigators Group: Energy (HGF-YIG-Energy)},
pid = {G:(DE-HGF)POF3-161 / G:(DE-HGF)HGF-YIG-Energy},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000412712900124},
doi = {10.1016/j.jallcom.2017.08.200},
url = {https://juser.fz-juelich.de/record/837116},
}