English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Transition metal oxides of composition A2BO4 (A is usually a rare-earth, alkaline-earth, or alkali ion and B can be a 3d or 4d transition-metal ion) with the layered K2NiF4 structure type have long been studied because they display a variety of unusual structural and magnetic properties. They have received considerable interest in recent years, particularly since the discovery of superconductivity in La2−xBaxCuO4 and Sr2RuO4.1−3 The two dimensional A2BO4 consists of perovskite-like corner linked BO6 sheets interleaved by the rock-salt AO layers, in which the large A cations are arranged in the plane formed by O atoms at the top (or bottom) of the octahedral with nine nearest O neighbors. One important factor that determines the structure of the A2BO4 compounds is the matching between the perovskite-like BO6 layers and the A-type cations. A measure of the bond length matching can be calculated from a version of the Goldschmidt tolerance factor t = (rA + rO)/ √2(rB + rO) for perovskite and perovskite-derived structure; ideal matching between the A cation and one layer of linked BO6 octahedra occurs for t ≈1 and the structure formed is tetragonal described in the space group I4/mmm (no. 139). In our earlier work, we have reported the synthesis, electric transport and magnetic properties of K2NiF4-type phases Ln0.5Sr1.5Mn0.5Fe0.5O4 (Ln = La, Nd, Gd, and Dy). In this reported work, much has been left about the structural characterization of the phases. In the present work, we report structural characterization of the Ln0.5Sr1.5Mn0.5Fe0.5O4 phases (Ln = La, Nd, Gd, and Dy) by Rietveld analysis using GSAS program. The bond angles and bond distances have been determined on the basis of structural parameters derived from structural refinements. EXPERIMENTAL

journal of the korean chemical society

Rietveld Refinements of K2NiF4-Type Phases Ln0.5Sr1.5Mn0.5Fe0.5O4(Ln = La, Nd, Gd, and Dy)