Effect of strontium atoms substitution on the features of two-slab structure of Sr1-xCaxLa2Sc2O7 scandates

Yuri Titov; Nadezhda Belyavina; Mykola Slobodyanik; Olesya Nakonechna; Nataliia Strutynska

doi:10.17721/fujcV9I1P44-50

Authors

Yuri Titov Taras Shevchenko National university of Kyiv http://orcid.org/0000-0001-9900-3751
Nadezhda Belyavina Taras Shevchenko National university of Kyiv http://orcid.org/0000-0001-7371-3608
Mykola Slobodyanik Taras Shevchenko National university of Kyiv http://orcid.org/0000-0003-2684-9806
Olesya Nakonechna Taras Shevchenko National university of Kyiv http://orcid.org/0000-0003-4205-5133
Nataliia Strutynska Taras Shevchenko National university of Kyiv http://orcid.org/0000-0001-9738-9689

DOI:

https://doi.org/10.17721/fujcV9I1P44-50

Keywords:

Ruddlesden-Popper compound, solid solution, X-ray powder diffraction method, slab perovskite-like structure

Abstract

Effects of substitution of the Strontium atoms with smaller Calcium atoms on the structural features of the Ruddlesden-Popper SrLa₂Sc₂O₇ two-slab compound is established. The crystal structure of orthorhombic Sr_0.85Ca_0.15La₂Sc₂O₇ phase with maximum degree of substitution was determined by the Rietveld method (Fmmm space group, a = 0.5766(2) nm, b = 0.5743(2) nm, c = 2.0522(7) nm). Comparison of the structural features of SrLa₂Sc₂O₇ and Sr_0.85Ca_0.15La₂Sc₂O₇ shows that such type of substitution leads to a decrease in the (La,Sr)2 - О2 interblock bond length (from 0.222 (2) nm at x = 0 to 0.215 (1) nm at x = 0.15). The decrease in interblock bond length brings the constitution of the two-dimensional structure Sr_1-хCa_xLa₂Sc₂O₇ closer to the structure of the three-dimensional perovskite, leads to its instability at х > 0.15 and gives a reason to conclude that this factor causes a limitation of region of the Sr_1-хCa_xLa₂Sc₂O₇ solid solutions with a slab perovskite-like structure. Presence of such structure changes is the precondition for regulation of structural-dependent features of the materials on the base of scandates alkaline-earth and rare earth metals.

References

Alexandrov KS, Beznosikov BV. Perovskity. Nastoyashcheye i budushcheye. Novosibirsk: SO RAN Publishers; 2004.

Schaak R, Mallouk T. Perovskites by Design: A Toolbox of Solid-State Reactions. Chemistry of Materials 2002;14(4):1455-1471. https://doi.org/10.1021/cm010689m

KIM I, NAKAMURA T, ITOH M. Humidity Sensing Effects of the Layered Oxides SrO (LaScO₃)_n (n=1, 2, ∞). Journal of the Ceramic Society of Japan 1993;101(1175):800-803. https://doi.org/10.2109/jcersj.101.800

Kato S. Synthesis and oxide ion conductivity of new layered perovskite La1−xSr1+xInO4−d. Solid State Ionics 2002;149(1-2):53-57. https://doi.org/10.1016/s0167-2738(02)00138-8

Lobanov M, Greenblatt M, Caspi E, Jorgensen J, Sheptyakov D, Toby B, Botez C, Stephens P. Crystal and magnetic structure of the Ca3Mn2O7Ruddlesden–Popper phase: neutron and synchrotron x-ray diffraction study. Journal of Physics: Condensed Matter 2004;16(29):5339-5348. https://doi.org/10.1088/0953-8984/16/29/023

Shimizu K, Itoh S, Hatamachi T, Kodama T, Sato M, Toda K. Photocatalytic Water Splitting on Ni-Intercalated Ruddlesden−Popper Tantalate H2La2/3Ta2O7. Chemistry of Materials 2005;17(20):5161-5166. https://doi.org/10.1021/cm050982c

Titov Y, Nedilko S, Chornii V, Scherbatskii V, Belyavina N, Markiv V, Polubinskii V. Crystal Structure and Luminescence of Layered Perovskites Sr₃LnInSnO₈. Solid State Phenomena 2015;230:67-72. https://doi.org/10.4028/www.scientific.net/ssp.230.67

Yang H, Shi J, Gong M. A new luminescent material, Sr2SnO4:Eu3+. Journal of Alloys and Compounds 2006;415(1-2):213-215. https://doi.org/10.1016/j.jallcom.2005.04.221

Titov YO, Belyavina NM, Slobodyanik MS, Chumak VV, Nakonechna OI. Synthesis and crystal structure of isovalently substituted slab SrLa2-xDyxSc2O7 scandates. Voprosy Khimii i Khimicheskoi Tekhnologii 2019;(6):228-235. https://doi.org/10.32434/0321-4095-2019-127-6-228-235

Titov Y, Belyavina N, Slobodyanik M, Chumak V. Crystal structure of isovalent substituted layered indates Ba1−xSrxLa2In2O7. Reports of the National Academy of Sciences of Ukraine 2016;(6):95-102. https://doi.org/10.15407/dopovidi2016.06.095

Titov YO, Belyavina NM, Slobodyanik MS, Chumak VV, Nakonechna OI. Features of the SrLa2Sс2–xInxO7 two-slab structure. Voprosy Khimii i Khimicheskoi Tekhnologii 2020;(2):118-124. https://doi.org/10.32434/0321-4095-2020-129-2-118-124

Titov Y, Belyavina N, Slobodyanik M, Nakonechna O, Strutynska N, Tymoshenko M. Effect of isovalent substitution on the crystal structure and properties of two-slab indates BaLa2−xSmxIn2O7. Open Chemistry 2020;18(1):1294-1303. https://doi.org/10.1515/chem-2020-0090

Dashevskyi M, Boshko O, Nakonechna O, Belyavina N. Phase transformations at mechanical milling of the equiatomic Y-Cu powder mixture. Metallofizika i Noveishie Tekhnologii. 2017;39(4):541-552. https://doi.org/10.15407/mfint.39.04.0541

Titov YO, Belyavina NM, Markiv VYa, Slobodyanik MS, Krayevska YaA, Chumak VV. Syntez ta krystalichna struktura sharuvatykh skandativ SrLn2Sc2O7. Dopovidi Natsionalnoi Akademii Nauk Ukrainy. http://dspace.nbuv.gov.ua/handle/123456789/8010

Shannon R. Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallographica Section A 1976;32(5):751-767. https://doi.org/10.1107/s0567739476001551