TY - JOUR
T1 - Neutron powder diffraction study of the superconducting quaternary intermetallic compound YNi2B2C
AU - Chakoumakos, B. C.
AU - Paranthaman, M.
PY - 1994/6/20
Y1 - 1994/6/20
N2 - The crystal structure of YNi2B2C has been refined at room temperature using powder neutron diffraction data obtained from samples prepared by arc-melting. The nominal composition YNi3B2.5C yields a phase assemblage of principally 85 volume % YNi2B2C relative to Ni2B, and the YNi2.5B2C composition yields 93 volume % relative to 7 volume % Ni3B. YNi2B2C is apparently incongruently melting. The crystal structure is simply viewed as a "stuffed" derivative of the common layered ThCr2Si2-type structure, by inserting C atoms in the lanthanide (actinide) layer. Structural data for the most phase-pure title compound include: I4/mmm symmetry, a=3.5257(1) A ̊, c=10.5336(4) A ̊ and x(B)=0.3589(4). The atomic sites appear to be fully occupied, and there is no indication of B↔Ni disorder. The arc-melted YNi3B2.5C (nominal) sample has a superconducting Tc of 15.6 K, as defined by the onset of diamagnetism.
AB - The crystal structure of YNi2B2C has been refined at room temperature using powder neutron diffraction data obtained from samples prepared by arc-melting. The nominal composition YNi3B2.5C yields a phase assemblage of principally 85 volume % YNi2B2C relative to Ni2B, and the YNi2.5B2C composition yields 93 volume % relative to 7 volume % Ni3B. YNi2B2C is apparently incongruently melting. The crystal structure is simply viewed as a "stuffed" derivative of the common layered ThCr2Si2-type structure, by inserting C atoms in the lanthanide (actinide) layer. Structural data for the most phase-pure title compound include: I4/mmm symmetry, a=3.5257(1) A ̊, c=10.5336(4) A ̊ and x(B)=0.3589(4). The atomic sites appear to be fully occupied, and there is no indication of B↔Ni disorder. The arc-melted YNi3B2.5C (nominal) sample has a superconducting Tc of 15.6 K, as defined by the onset of diamagnetism.
UR - http://www.scopus.com/inward/record.url?scp=0028444076&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(94)90367-0
DO - 10.1016/0921-4534(94)90367-0
M3 - Article
AN - SCOPUS:0028444076
SN - 0921-4534
VL - 227
SP - 143
EP - 150
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -