Crystal growth and properties of Ln{sub 2}Ag{sub 1-x}Ga{sub 10-y} (Ln=La, Ce), a disordered variant of the Ce{sub 2}NiGa{sub 10}-structure type

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.06.011· OSTI ID:21432462

Menard, Melissa C ^[1]; Xiong, Yimin; Karki, Amar B ^[2]; Drake, Brenton L ^[1]; Adams, Philip W ^[2]; Fronczek, Frank R ^[1]; Young, David P ^[2]

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1. Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803-1804 (United States)
2. Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, LA 70803-1804 (United States)

We report the flux growth and characterization of Ln{sub 2}Ag{sub 1-x}Ga{sub 10-y} (Ln=La, Ce), a disordered variant of the Ce{sub 2}NiGa{sub 10} structure type. Single crystals of La{sub 2}Ag{sub 1-x}Ga{sub 10-y} (x{approx}0.3; y{approx}0.6) and Ce{sub 2}Ag{sub 1-x}Ga{sub 10-y} (x{approx}0.3; y{approx}0.9) were grown by the self-flux method and characterized using single-crystal X-ray diffraction. Transport measurements of Ce{sub 2}Ag{sub 1-x}Ga{sub 10-y} (x{approx}0.3; y{approx}0.9) reveal metallic behavior with a transition at 3 K. Magnetic measurements indicate antiferromagnetic ordering at 3 K of localized Ce{sup 3+} moments for Ce{sub 2}Ag{sub 1-x}Ga{sub 10-y}. Magnetoresistance is positive with a maximum value of 16% at 9 T. La{sub 2}Ag{sub 1-x}Ga{sub 10-y} exhibits metallic behavior with magnetic susceptibility showing temperature independent paramagnetism. We will compare Ce{sub 2}Ag{sub 1-x}Ga{sub 10-y} (x{approx}0.3; y{approx}0.9) to Ce{sub 2}NiGa{sub 10} to examine the effects of transition metal substitution and to the related Ce(Ag,Ga){sub 4} phase to examine the effects of crystal structure on the physical properties. - Graphical abstract: The figure illustrates the structure of Ce{sub 2}Ag{sub 0.7(1)}Ga{sub 9.1(1)}, which can be described as a distorted variant of the Ce{sub 2}NiGa{sub 10} structure. The distorted gallium segments are best described as variants of CeGa{sub 6} (PuGa{sub 6}-structure type), and the distorted Ce(Ag,Ga){sub 4}-type segments are built of layers of face-sharing tetragonal antiprisms. Here M=Ag+Ga and the shaded atoms are partially occupied.

• OSTI ID: 21432462
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 9; Other Information: DOI: 10.1016/j.jssc.2010.06.011; PII: S0022-4596(10)00262-8; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
CERIUM ALLOYS
CERIUM IONS
CRYSTAL GROWTH
CRYSTAL STRUCTURE
GALLIUM ALLOYS
LANTHANUM ALLOYS
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
MONOCRYSTALS
SILVER ALLOYS
TEMPERATURE RANGE 0000-0013 K
X-RAY DIFFRACTION
ALLOYS
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IONS
MAGNETIC PROPERTIES
MAGNETISM
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENT ALLOYS