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000837116 1001_ $$0P:(DE-HGF)0$$aMurphy, Gabriel L.$$b0
000837116 245__ $$aStructure and phase transition in BaThO 3 : A combined neutron and synchrotron X-ray diffraction study
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000837116 520__ $$aThe structure of BaThO3, obtained by solid state synthesis, was refined for the first time by the Rietveld method using a combination of synchrotron X-ray and neutron powder diffraction data. BaThO3 has an orthorhombic structure at room temperature, in space group Pbnm with a = 6.3491(5), b = 6.3796(4) and c = 8.9907(7) Å. Heating BaThO3 to above 700 °C results in a continuous transition to a second orthorhombic structure, in space group Ibmm, demonstrated by both in situ neutron and synchrotron X-ray powder diffraction measurements. The coefficient of volumetric thermal expansion for BaThO3 is determined to be 1.04 × 10−5 °C-1 from 50 to 625 °C (Pbnm phase), and 9.43 × 10−6 °C-1 from 800 to 1000 °C (Ibmm phase). BaThO3 was found to decompose upon exposure to atmospheric moisture resulting in the formation of ThO2. The thermal expansion of ThO2, which invariably co-exists with BaThO3, is also described.
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000837116 7001_ $$00000-0003-4352-136X$$aKennedy, Brendan J.$$b1$$eCorresponding author
000837116 7001_ $$0P:(DE-HGF)0$$aZhang, Zhaoming$$b2
000837116 7001_ $$0P:(DE-HGF)0$$aAvdeev, Maxim$$b3
000837116 7001_ $$0P:(DE-HGF)0$$aBrand, Helen E. A.$$b4
000837116 7001_ $$0P:(DE-Juel1)159378$$aKegler, Philip$$b5
000837116 7001_ $$0P:(DE-Juel1)144426$$aAlekseev, Evgeny$$b6
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