Oxygen nonstoichiometry, electrical conductivity and thermal expansion of La2 xSrxNiO4-δphases with high levels of strontium substitution (1 =< x =< 1.4) have been investigated in air and oxygen atmosphere in the temperature range 20-1050 degrees C. These phases retain the K2NiF4-type structure of La2NiO4 (tetragonal, space group I4/mmm). The oxygen vacancy fraction was determined independently from thermogravimetric and neutron diffraction experiments, and is found to increase considerably on heating. The electrical resistivity, thermal expansion and cell parameters with temperature show peculiar variations with temperature, and differ notably from La2NiO4$\pm$δin this respect. These variations are tentatively correlated with the evolution of nickel oxidation state, which crosses from a Ni3+/Ni4+ to a Ni2+/Ni3+ equilibrium on heating.
Designing heterostructures to control oxygen stoichiometry in helimagnetic perovskite strontium ferrite
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory（斯坦福材料能源科学研究所，SLAC国家加速器实验室）；Department of Applied Physics, Stanford University（斯坦福大学应用物理系）；Department of Materials Science and Engineering, Northwestern University（西北大学材料科学与工程系）；Catalan Institute of Nanoscience and Nanotechnology (ICN2)（加泰罗尼亚纳米科学与纳米技术研究所（ICN2））；School of Applied and Engineering Physics, Cornell University（康奈尔大学应用与工程物理学院）；Center for Nanophase Materials Sciences, Oak Ridge National Laboratory（橡树岭国家实验室纳米材料科学中心）；Department of Material Science Engineering, Pusan National University（釜山大学材料科学与工程系）；Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory（SLAC国家加速器实验室斯坦福同步辐射光源）
Stoichiometric Epitaxial Strontium Titanate Thin Films on Silicon by High-Temperature Sr Segregation
Imec；Department of Materials Engineering (MTM), KU Leuven（荷语鲁汶大学材料工程系）；Physics Department, Jean Monnet University（圣艾蒂安让·穆内大学物理系）；Department of Information Technology (INTEC), Photonics Research Group, Ghent University（根特大学信息与科技学院光子学研究组）
Oxygen Vacancies at Dislocation Core Modulate Plasticity in Strontium Titanate
Ames National Laboratory（艾姆斯国家实验室）；North Carolina State University（北卡罗来纳州立大学）；Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）；Iowa State University（爱荷华州立大学）；University of Virginia（弗吉尼亚大学）
From perovskite to infinite-layer nickelates: hole concentration from x-ray absorption
Max Planck Institute for Solid State Research（马克斯·普朗克固体研究所）；Universite de Strasbourg, CNRS, IPCMS UMR 7504（斯特拉斯堡大学）；Helmholtz-Zentrum Berlin für Materialien und Energie（柏林亥姆霍兹材料与能源中心）；European Synchrotron Radiation Facility（欧洲同步辐射装置）；Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院）
Interstitial oxygen order and its competition with superconductivity in La$_2$PrNi$_2$O$_{7+δ}$
Tsinghua University（清华大学）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；New Cornerstone Science Laboratory（新 cornerstones 科学实验室）；Hefei National Laboratory（合肥国家实验室）
