Gabriel Clarke, Chris Ablitt, John Daniels, Stefano Checchia and Mark S. Senn. J. Appl. Cryst. (2021) 54. Improper ferroelectric materials are increasingly under investigation for their potential to expand the catalogue of functional ferroelectrics and couple with properties such as ferromagnetism. This work presents the results of an in situ synchrotron X-ray diffraction experiment performedRead more
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Fernando Pomiro, Chris Ablitt, Nicholas C. Bristowe, Arash A. Mostofi, Choongjae Won, Sang-Wook Cheong, and Mark S. Senn.Phys. Rev. B 102, 014101. Hybrid improper ferroelectrics (HIFs) have been studied intensively over the past few years to gain an understanding of their temperature-induced phase transitions and ferroelectric switching pathways. Here we report a switching from aRead more
Chris Ablitt, Harriet McCay, Sarah Craddock, Lauren Cooper, Emily Reynolds, Arash A. Mostofi, Nicholas C. Bristowe, Claire A. Murray, and Mark S. Senn. Chem. Mater. 2020, 32, 1, 605-610. By tuning the tolerance factor, t, of the Ruddlesden–Popper oxide Ca2MnO4 through isovalent substitutions, we show that the uniaxial coefficient of linear thermal expansion (CLTE) ofRead more
Wei-Tin Chen, Chris Ablitt, Nicholas C. Bristowe, Arash A. Mostofi, Takashi Saito, Yuichi Shimakawaf and Mark S. Senn . Chem. Commun., 2019, Advance Article 10.1039/C8CC09614G We report the high pressure synthesis of a layered perovskite Ca2GeO4 which is found to have the Ruddlesden–Popper structure with I41/acd symmetry. Consonant with our recent predictions [Ablitt et al.,Read more
Ablitt C, Mostofi AA, Bristowe NC and Senn MS (2018) Control of Uniaxial Negative Thermal Expansion in Layered Perovskites by Tuning Layer Thickness. Front. Chem. 6:455. doi: 10.3389/fchem.2018.00455 Uniaxial negative thermal expansion (NTE) is known to occur in low $n$ members of the An+1$BnO3n+1 Ruddlesden–Popper layered perovskite series with a frozen rotation of BO_6 octahedra about the layering axis. PreviousRead more
Chris Ablitt, Sarah Craddock, Mark S. Senn, Arash A. Mostofi & Nicholas C. Bristowe, npj Computational Materials 3, Article number: 44 (2017) doi:10.1038/s41524-017-0040-0 Why is it that ABO3 perovskites generally do not exhibit negative thermal expansion (NTE) over a wide temperature range, whereas layered perovskites of the same chemical family often do? It isRead more
Mark S. Senn, Claire A. Murray, Xuan Luo, Lihai Wang, Fei-Ting Huang, Sang-Wook Cheong, Alessandro Bombardi, Chris Ablitt, Arash A. Mostofi, and Nicholas C. Bristowe, J. Am. Chem. Soc., 10.1021/jacs.5b13192 The layered perovskite Ca3–xSrxMn2O7 is shown to exhibit a switching from a material exhibiting uniaxial negative to positive thermal expansion as a function of x.Read more