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Title: Pr{sub 1.33}Pt{sub 4}Ga{sub 10}: Superstructure and magnetism

Pr{sub 1.33}Pt{sub 4}Ga{sub 10} crystals were prepared by Ga-flux method. The superstructure of this compound was studied by single-crystal X-ray diffraction (XRD), transmission electron microscopy (TEM), and diffuse X-ray scattering. Pr{sub 1.33}Pt{sub 4}Ga{sub 10} adopts the P6{sub 3}/mmc space group with a=b=4.3227(5) Å, c=16.485(3) Å: the structure features Pr{sub 2}Ga{sub 3} layers alternating with Pt{sub 2}Ga{sub 4} layers along the c-axis. TEM studies and pair distribution function (PDF) analysis of X-ray total scattering data show that Pr{sub 2}Ga{sub 3} layers possess an ordered superstructure (of dimension a′=a√(3)) in which Pr vacancies and Ga atoms are ordered within the ab-plane but disordered along the c-direction. PDF analysis also shows temperature-dependent structural features local to the Pr{sup 3+} ion. Magnetic measurements reveal that Pr{sup 3+} ions order ferrimagnetically below 12.5(2) K. - Graphical abstract: Left: Crystal structure of Pr{sub 1.33}Pt{sub 4}Ga{sub 10} showing Pr and Ga vacancies in the Pr{sub 2}Ga{sub 3} plane. Right: Tunneling electron microscopy (TEM) image of Pr{sub 1.33}Pt{sub 4}Ga{sub 10}. These vacancies have been studied using TEM and pair distribution function analysis. Magnetic measurements reveal that Pr{sup 3+} ions order ferrimagnetically below 7.8(2) K. - Highlights: • TEM studies indicate a superstructure from Pr and Ga vacancies. •more » Pair distribution function analyses may point to structural relaxation of vacancies. • Pr{sub 1.33}Pt{sub 4}Ga{sub 10} behaves as a ferromagnet and exhibits a metamagnetic transition.« less
Authors:
;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [1]
  1. Department of Chemistry and Biochemistry, University of Northern Colorado, Greeley, CO 80639 (United States)
  2. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306 (United States)
  3. (United States)
  4. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310 (United States)
  5. X-Ray Science Division, The Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439 (United States)
  6. Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803 (United States)
Publication Date:
OSTI Identifier:
22451105
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 220; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DISTRIBUTION FUNCTIONS; HCP LATTICES; MAGNETISM; MONOCRYSTALS; PRASEODYMIUM IONS; SPACE GROUPS; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; TUNNEL EFFECT; X RADIATION; X-RAY DIFFRACTION