Structural and magnetic studies of KOsO4, a 5d1 quantum magnet oxide

2019 ◽  
Vol 21 (14) ◽  
pp. 7261-7264 ◽  
Author(s):  
Sean Injac ◽  
Alexander K. L. Yuen ◽  
Maxim Avdeev ◽  
Fabio Orlandi ◽  
Brendan J. Kennedy
Keyword(s):  
Neutron Diffraction ◽  
Oxide System ◽  
Magnetic Studies ◽  
Magnetic Characterization ◽  
X Ray ◽  
Quantum Magnet ◽  
System P

The quantum magnet KOsO4 has been characterized by a combination of X-ray and neutron diffraction techniques. This represents the first structural and magnetic characterization of a simple Os7+, S = 1/2 oxide system.

Structural and magnetic characterization of Ho3SbO7 and Dy3SbO7

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1415-1419 ◽  
Author(s):  
T Fennell ◽  
S T Bramwell ◽  
M A Green
Keyword(s):  
Crystal Structure ◽  
Experimental Investigation ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
Magnetic Characterization ◽  
X Ray ◽  
Structural And Magnetic Properties ◽  
Ice Model ◽  
Magnetic Rare Earth

We present an experimental investigation of the structural and magnetic properties of Ho3SbO7 and Dy3SbO7. These compounds adopt the Y3TaO7 structure, space group C2221. The magnetic rare-earth ions occupy an intricate lattice related to the pyrochlore lattice that occurs in Ho2Ti2O7 and Dy2Ti2O7. The crystal structure of Ho3SbO7 is determined by Rietveld refinement of the powder X-ray diffraction pattern at ambient temperature, and that of the Dy analogue is inferred to be similar. Magnetic susceptibility measurements show that Ho3SbO7 and Dy3SbO7 have negative Curie–Weiss temperatures: –8.4 K (Ho) and –9.2 K (Dy). Magnetic transitions have been detected at 2.0 K (Ho) and 3.0 K (Dy). We discuss the results in terms of the ``dipolar spin ice model'' that has been used to describe Ho2Ti2O7 and Dy2Ti2O7. PACS Nos.: 75.25+z, 75.50Ee, 61.10Nz

Synthesis and Characterization of the First 1:2 Ordered Perovskite Ruthenate

2002 ◽  
Vol 718 ◽  
Author(s):  
Job Rijssenbeek ◽  
Sylvie Malo ◽  
Takashi Saito ◽  
Vincent Caignaert ◽  
Masaki Azuma ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Neutron Diffraction ◽  
Structure Type ◽  
Synthesis And Characterization ◽  
Neutron Diffraction Data ◽  
X Ray ◽  
Relationship Of ◽  
The Relationship ◽  
Perovskite Lattice

AbstractPerovskite-like mixed metal ruthenates are of interest owing to their varied electronic and magnetic properties, which are heavily dependent on the ordering of the transition metals. We report the synthesis and structural characterization of the first 1:2 ordered perovskite ruthenate, Sr3CaRu2O9. The structure was determined from a combination of powder X-ray, electron and neutron diffraction data and is characterized by a 1:2 ordering of Ca2+ and Ru5+ over the sixcoordinate B-sites of the perovskite lattice. Sr3CaRu2O9 is the first example of this structure-type to include a majority metal with d electrons (Ru(V), d3). The relationship of this material to the K2NiF4-type Sr1.5Ca0.5RuO4 (i.e., Sr3CaRu2O8) highlights the dramatic effects of the ruthenium valence on the resultant structure. Remarkably, these two structures can be quantitatively interconverted by the appropriate choice of reaction temperature and atmosphere.

Synthesis, Structure and Magnetic Characterization of a New Phosphate K1.84Fe1.42Nb0.58(PO4)3 with the Langbeinite- type Structure

2008 ◽  
Vol 63 (3) ◽  
pp. 345-348 ◽  
Author(s):  
Artem A. Babaryk ◽  
Igor V. Zatovsky ◽  
Nikolay S. Slobodyanik ◽  
Ivan V. Ogorodnyk
Keyword(s):  
Crystal Structure ◽  
Low Temperatures ◽  
Structure Type ◽  
The Self ◽  
Magnetic Characterization ◽  
X Ray ◽  
Complex Phosphate ◽  
Cubic System ◽  
The Relationship

A new complex phosphate K1.84Fe1.42Nb0.58(PO4)3 has been synthesized by the self-flux technique. The X-ray single crystal structure and magnetic properties were studied. The compound crystallizes in the cubic system with space group P213 (a = 9.9404(10) Å ) and belongs to the langbeinite structure type. The structure contains [M2P3O18] building units. “Closed” fragments [M8P9O60] provide space for location of two potassium atoms. Antiferromagnetic interactions were detected at low temperatures which originate from superexchange through a M(1)-O-P-O-M(2) pathway with corresponding J = −5.5(1) cm−1. The relationship between the UV/vis absorption and the structure is discussed.

Structural characterization of R2BaCuO5 (R = Y, Lu, Yb, Tm, Er, Ho, Dy, Gd, Eu and Sm) oxides by X-ray and neutron diffraction

1992 ◽  
Vol 100 (2) ◽  
pp. 201-211 ◽  
Author(s):  
A. Salinas-Sanchez ◽  
J.L. Garcia-Muñoz ◽  
J. Rodriguez-Carvajal ◽  
R. Saez-Puche ◽  
J.L. Martinez
Keyword(s):  
Neutron Diffraction ◽  
Structural Characterization ◽  
X Ray

Defect structure and chemistry of (Ca x Sr 1-x ) n+1 Ti n 0 3n+1 layer perovskites

1991 ◽  
Vol 336 (1644) ◽  
pp. 541-569 ◽  
Keyword(s):  
Neutron Diffraction ◽  
Alkaline Earth ◽  
Structural Information ◽  
High Resolution Electron Microscopy ◽  
Oxide Superconductors ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Resolution Electron ◽  
The Stability

The Ruddlesden-Popper structural family is constructed from ordered intergrowths of rocksalt type (AX) layers with perovskite (ABX 3 ) blocks of varying widths, yielding phases with the general formula n ABX 3 AX where 1 < n < ∞ In this article, the characterization of (Ca x Sr 1-x ) n+1 Ti n O 3n+1 layer perovskites by powder X-ray and neutron diffraction and high resolution electron microscopy is described. These phases undergo a phase transition from tetragonal to orthorhombic symmetry at x = 0.65. Structure solutions of neutron diffraction data are presented for the end-member phases Sr 3 Ti 2 O 7 (I4/mmm), Ca 3 Ti 2 O 7 (Ccm2 1 ) and Ca 4 Ti 3 O 10 (Pcab). Refinement of the mixed alkaline earth preparation (Ca 0.85 Sr 0.15 ) 4 Ti 3 O 10 showed that Sr partitioned preferentially to the perovskite blocks rather than the rocksalt layers. Ordered and disordered intergrowths of rocksalt layers were found on the{101} orth = {100} tet perovskite planes with extensive disorder most prevalent in samples annealed for short periods (less than 24 hours). Evidence is presented for the existence of V"A and V"," point defects in the intermediate structures that precede the formation of ordered layer sequences. These data are discussed in terms of existing thermodynamic and structural information. For generalized Ruddlesden Popper phases the relation between chemistry and symmetry is reviewed and factors contributing to the stability of different n -members enunciated. For completeness, the (Ca x Sr 1-x ) n+1 Ti n O 3n+1 perovskites are considered as the structural prototypes of the oxide superconductors being a subset of an extended n ABX 3 mAX Ruddlesden-Popper family.

Synthesis, X-Ray Crystal Structure and Magnetic Characterization of the First “Ni3S4N3” Nickel Thiolate Cluster

1995 ◽  
Vol 128 (2) ◽  
pp. 125-129 ◽  
Author(s):  
Albrecht Berkessel ◽  
Jan W. Bats ◽  
Martina Hüber ◽  
Wolfgang Haase ◽  
Thomas Neumann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Characterization ◽  
X Ray
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