K{sub 3}Ln[OB(OH){sub 2}]{sub 2}[HOPO{sub 3}]{sub 2} (Ln=Yb, Lu): Layered rare-earth dihydrogen borate monohydrogen phosphates

• Published in: Journal of solid state chemistry 2011-06, Vol.184 (6)
• Main Authors: Zhou Yan, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, Hoffmann, Stefan, Huang Yaxi, Prots, Yurii, Schnelle, Walter, Menezes, Prashanth W., Carrillo-Cabrera, Wilder, Sichelschmidt, Joerg, Mi Jinxiao, Kniep, Ruediger
• Format: Article
• Language: English
• Subjects: ALKALI METALS; BORATES; BORON COMPOUNDS; CATIONS; CHARGED PARTICLES; COHERENT SCATTERING; CRYSTALS; DIFFRACTION; ELECTRON SPIN RESONANCE; ELEMENTS; HYDROTHERMAL SYNTHESIS; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; IONS; LAYERS; MAGNETIC PROPERTIES; MAGNETIC RESONANCE; MAGNETIC SUSCEPTIBILITY; MAGNETISM; MAGNETIZATION; METALS; MONOCRYSTALS; OXYGEN COMPOUNDS; PARAMAGNETISM; PHOSPHATES; PHOSPHORUS COMPOUNDS; PHYSICAL PROPERTIES; POTASSIUM; RARE EARTH COMPOUNDS; RARE EARTHS; RESONANCE; SCATTERING; SPECTROSCOPY; STRUCTURAL CHEMICAL ANALYSIS; SYNTHESIS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; YTTERBIUM COMPOUNDS; YTTERBIUM IONS
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2011.04.023

Two isotypic layered rare-earth borate phosphates, K{sub 3}Ln[OB(OH){sub 2}]{sub 2}[HOPO{sub 3}]{sub 2} (Ln=Yb, Lu), were synthesized hydrothermally and the crystal structures were determined by single-crystal X-ray diffraction (R3-bar , Z=3, Yb: a=5.6809(2) A, c=36.594(5) A, V=1022.8(2) A{sup 3}, Lu: a=5.6668(2) A, c=36.692(2) A, V=1020.4(1) A{sup 3}). The crystal structure can be described in terms of stacking of Glaserite-type slabs consisting of LnO{sub 6} octahedra interlinked by phosphate tetrahedra and additional layers of [OB(OH){sub 2}]{sup -} separated by K{sup +} ions. Field and temperature dependent measurements of the magnetic susceptibility of the Yb-compound revealed Curie-Weiss paramagnetic behavior above 120 K ({mu}{sub eff}=4.7 {mu}{sub B}). Magnetic ordering was not observed down to 1.8 K. - Graphical abstract: Two isotypic layered rare-earth borate phosphates, K{sub 3}Ln[OB(OH){sub 2}]{sub 2}[HOPO{sub 3}]{sub 2} (Ln = Yb, Lu), were synthesized hydrothermally and the crystal structures were determined by single-crystal X-ray diffraction. The structure can be described by stacking of Glaserite-type slabs and dihydrogen borate layers separated by potassium cations. Highlights: > First hydrothermal synthesis of rare-earth borate phosphates. > Instead of microcrystalline powders the synthesis of single crystals was achieved. > Successful single-crystal X-ray structure determination. > 2D arrangement of magnetic rare-earth ions. > EPR spectrum of Yb{sup 3+} at 5 K.