Synthesis, Spectroscopic and Magnetic Properties of the Co2(OH)(PO4)1-x-(AsO4)x [0 ≤ x ≤ 1] Solid Solution

被引:8
作者
de Pedro, Imanol [1 ,2 ]
Maria Rojo, Jose [1 ]
Rodriguez Fernandez, Jesus [2 ]
Lezama, Luis [1 ]
Rojo, Teofilo [1 ]
机构
[1] Univ Pais Vasco UPV EHU, Dept Quim Inorgan, Fac Ciencia & Tecnol, Bilbao 48080, Spain
[2] Univ Cantabria, CITIMAC, Fac Ciencias, E-39005 Santander, Spain
关键词
Hydrothermal synthesis; Solid solution; Spectroscopic properties; Magnetic properties; Solid-state structures; Cobalt; Arsenic; POWDER DIFFRACTION; CRYSTAL-STRUCTURE; ARSENATES; ADAMITE; SUBSTITUTION; ZN-2(OH)PO4; CO-2(OH)PO4; PHOSPHATES; CHEMISTRY; BEHAVIOR;
D O I
10.1002/ejic.201000138
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The Co-2(OH)(PO4)(1-x)(AsO4)(x) [0 <= x <= 1] solid solution was prepared by hydrothermal synthesis and, polycrystalline samples characterized by X-ray powder diffraction and spectroscopic measurements. The cell parameters of the isostructural phosphate-arsenate phases follow Vegard's law in the whole range of composition. The IR spectra are characteristic of three distinct features corresponding principally to the vibrations of both the hydroxide and tetrahedral (XO4)(3-) (X = P, As) groups together with the evolution of the intensity of stretching [vas (X-O)] vibration modes corresponding to the PO4 and AsO4 tetrahedra in the solid solution. Diffuse reflectance data show bands belonging to the octahedral and trigonal bipyramidal geometries of the Co2+ ions with a high degree of covalence in the Co-O bonds of the arsenate phases. Magnetization measurements of Co-2(OH)(PO4)(1-x)(AsO4)(x) [0 <= x <= 1] show the existence of antiferromagnetic interactions with the presence of a ferromagnetic component below the ordering temperature. TN decreases from 71 to 19 K as the arsenate amount is increased. ZFC-FC curves show irreversibility just below T-N for Co-2(OH)(PO4)(1-x)(AsO4)(x) [x = 0.1-0.75]. The magnetic behavior of Co-2(OH)(PO4)(0.1)(AsO4)(0.9) is completely different from the rest of the hydroxyphosphate-arsenate members and similar to that observed in the undoped arsenate compound where an incommensurate magnetic phase is observed.
引用
收藏
页码:2514 / 2522
页数:9
相关论文
共 40 条
[1]   Syntheses, structural analyses, and unusual magnetic properties of Ba2CoSi2O7 and BaCo2Si2O7 [J].
Adams, RD ;
Layland, R ;
Payen, C ;
Datta, T .
INORGANIC CHEMISTRY, 1996, 35 (12) :3492-3497
[2]   Nature of the magnetic order in Ca3Co2O6 [J].
Agrestini, S. ;
Chapon, L. C. ;
Daoud-Aladine, A. ;
Schefer, J. ;
Gukasov, A. ;
Mazzoli, C. ;
Lees, M. R. ;
Petrenko, O. A. .
PHYSICAL REVIEW LETTERS, 2008, 101 (09)
[3]  
[Anonymous], N JB MINERAL MH
[4]   A new mineral, zincolibethenite, CuZnPO4OH, a stoichiometric species of specific site occupancy [J].
Braithwaite, RSW ;
Pritchard, RG ;
Paar, WH ;
Pattrick, RAD .
MINERALOGICAL MAGAZINE, 2005, 69 (02) :145-153
[6]  
Carlin R. L., 1986, MAGNETOCHEMISTRY
[7]   ROLE OF ION-EXCHANGE IN SOLID-STATE CHEMISTRY [J].
CLEARFIELD, A .
CHEMICAL REVIEWS, 1988, 88 (01) :125-148
[8]  
Corbridge D.E.C., 1974, STRUCTURAL CHEM PHOS
[9]  
CORDSEN A, 1978, CANADIAN MINERALOGIS, V0016
[10]   Spectroscopic and magnetic properties Co1.7MnO0.3(PO4) [J].
de Pedro, I. ;
Rojo, J. M. ;
Lezama, L. ;
Rojo, T. .
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 2007, 633 (11-12) :1847-1852