Magnetically induced lattice distortions in the neptunium monopnictides

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From 19th conference on magnetism and magnetic materials; Boston, Massachusetts, USA (13 Nov 1973). The lattice parameters of the neptunium monopnictides (NaCl crystal structure) were measured between 5 and 300 deg K by x- ray diffraction. NpN becomes ferromagnetic at 87 deg K. At T/sub c/ a rhombohedral distortion, which indicates that the (111) is the easy axis, is observed. At 5 deg K, the rhombohedral angle is 60.46 plus or minus 0.02 deg . NpP exhibits a tetragonal distortion at 74 deg K, at which temperature the antiferromagnetic 3+, 3- structure becomes commensurate with the lattice. At 5 deg ... continued below

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Pages: 7

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Mueller, M.H.; Lander, G.H.; Knott, H.W. & Reddy, J.F. January 1, 1973.

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Description

From 19th conference on magnetism and magnetic materials; Boston, Massachusetts, USA (13 Nov 1973). The lattice parameters of the neptunium monopnictides (NaCl crystal structure) were measured between 5 and 300 deg K by x- ray diffraction. NpN becomes ferromagnetic at 87 deg K. At T/sub c/ a rhombohedral distortion, which indicates that the (111) is the easy axis, is observed. At 5 deg K, the rhombohedral angle is 60.46 plus or minus 0.02 deg . NpP exhibits a tetragonal distortion at 74 deg K, at which temperature the antiferromagnetic 3+, 3- structure becomes commensurate with the lattice. At 5 deg K, c/a = 0.9958 plus or minus 2. NpAs becomes tetragonal at T/sub N/ = 175 deg K when the material has a 4+, 4- structure. However, NpAs returns to being a cubic at 142 deg K at which temperature the magnetic structure is the simple plus or minus (type I) configuration. The return'' to cubic is first order; the volume of the unit cell expands by 0.23%. Np,Sb, which orders antiferromagnetically at 207 deg K with the type I structure, remains cubic in the ordered regime. (auth)

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Pages: 7

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  • 19. conference on magnetism and magnetic materials, Boston, Massachusetts, USA, 13 Nov 1973

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  • Report No.: CONF-731104--7
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4421771
  • Archival Resource Key: ark:/67531/metadc1026365

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1973

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 27, 2017, 3:40 p.m.

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Mueller, M.H.; Lander, G.H.; Knott, H.W. & Reddy, J.F. Magnetically induced lattice distortions in the neptunium monopnictides, article, January 1, 1973; Illinois. (digital.library.unt.edu/ark:/67531/metadc1026365/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.