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Title: The Na{sub 2}O-SrO-B{sub 2}O{sub 3} diagram in the B-rich part and the crystal structure of NaSrB{sub 5}O{sub 9}

Abstract

The subsolidus phase relations in the B-rich part of the ternary system, Na{sub 2}O-SrO-B{sub 2}O{sub 3}, are investigated by the powder X-ray diffraction method. Four ternary compounds: NaSrBO{sub 3}, NaSr{sub 4}B{sub 3}O{sub 9}, Na{sub 3}SrB{sub 5}O{sub 10} and NaSrB{sub 5}O{sub 9} were found in it, the two lasts are new. NaSrB{sub 5}O{sub 9} crystallizes in the monoclinic space group P2{sub 1} /c, with the lattice parameters a=6.4963(1) A, b=13.9703(2) A, c=8.0515(1) A, {beta}=106.900(1){sup o}. Na{sub 3}SrB{sub 5}O{sub 9} is also monoclinic, space group C2, a=7.290(1) A, b=13.442(2) A, c=9.792(1) A, {beta}=109.60(1). NaSrB{sub 5}O{sub 9} is isostructural with another pentaborate NaCaB{sub 5}O{sub 9}, and its structure was refined by Rietveld method based on the structural model of NaCaB{sub 5}O{sub 9}. The fundamental building units are [B{sub 5}O{sub 9}]{sup 3-} anionic groups, forming complex thick anionic sheets, extending parallel to the ac plane. The Na and Sr atoms are all eight-coordinated with O atoms, forming trigonal dodecahedra. The [NaO{sub 8}] polyhedra are distributed between the B-O sheets, while the [SrO{sub 8}] polyhedra located in the sheets and connect with each other by edges to form infinite chains along the c-axis. - Graphical abstract: The subsolidus phase relations in the B-rich part ofmore » Na{sub 2}O-SrO-B{sub 2}O{sub 3} system has been investigated by powder diffraction. At the same time, two new pentaborates, NaSrB{sub 5}O{sub 9} and Na{sub 3}SrB{sub 5}O{sub 10}, have been successfully synthesized by standard solid-state reaction, and the crystal structure of NaSrB{sub 5}O{sub 9} has been refined by Rietveld method based on the structural model of NaCaB{sub 5}O{sub 9}. It crystallizes in the monoclinic space group P2{sub 1} /c with lattice parameters: a=6.4963(1) A, b=13.9703(2) A, c=8.0515(1) A, {beta}=106.900(1){sup o}. The fundamental building units are [B{sub 5}O{sub 9}]{sup 3-} anionic groups, and structure is composed of separated [BO] sheets, with Na atoms located in between the sheets and Sr atoms surrounded by the [BO] groups.« less

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [2]
  1. Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300457, Ministry of Education (China), E-mail: lwu@nankai.edu.cn
  2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)
  3. Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300457, Ministry of Education (China)
Publication Date:
OSTI Identifier:
21015798
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2007.02.014; PII: S0022-4596(07)00088-6; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BORON OXIDES; LATTICE PARAMETERS; MONOCLINIC LATTICES; SODIUM OXIDES; SPACE GROUPS; STRONTIUM OXIDES; STRUCTURAL MODELS; X-RAY DIFFRACTION

Citation Formats

Wu, L., Zhang, Y., Chen, X.L., Kong, Y.F., Sun, T.Q., Xu, J.J., and Xu, Y.P. The Na{sub 2}O-SrO-B{sub 2}O{sub 3} diagram in the B-rich part and the crystal structure of NaSrB{sub 5}O{sub 9}. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.02.014.
Wu, L., Zhang, Y., Chen, X.L., Kong, Y.F., Sun, T.Q., Xu, J.J., & Xu, Y.P. The Na{sub 2}O-SrO-B{sub 2}O{sub 3} diagram in the B-rich part and the crystal structure of NaSrB{sub 5}O{sub 9}. United States. doi:10.1016/j.jssc.2007.02.014.
Wu, L., Zhang, Y., Chen, X.L., Kong, Y.F., Sun, T.Q., Xu, J.J., and Xu, Y.P. Sun . "The Na{sub 2}O-SrO-B{sub 2}O{sub 3} diagram in the B-rich part and the crystal structure of NaSrB{sub 5}O{sub 9}". United States. doi:10.1016/j.jssc.2007.02.014.
@article{osti_21015798,
title = {The Na{sub 2}O-SrO-B{sub 2}O{sub 3} diagram in the B-rich part and the crystal structure of NaSrB{sub 5}O{sub 9}},
author = {Wu, L. and Zhang, Y. and Chen, X.L. and Kong, Y.F. and Sun, T.Q. and Xu, J.J. and Xu, Y.P.},
abstractNote = {The subsolidus phase relations in the B-rich part of the ternary system, Na{sub 2}O-SrO-B{sub 2}O{sub 3}, are investigated by the powder X-ray diffraction method. Four ternary compounds: NaSrBO{sub 3}, NaSr{sub 4}B{sub 3}O{sub 9}, Na{sub 3}SrB{sub 5}O{sub 10} and NaSrB{sub 5}O{sub 9} were found in it, the two lasts are new. NaSrB{sub 5}O{sub 9} crystallizes in the monoclinic space group P2{sub 1} /c, with the lattice parameters a=6.4963(1) A, b=13.9703(2) A, c=8.0515(1) A, {beta}=106.900(1){sup o}. Na{sub 3}SrB{sub 5}O{sub 9} is also monoclinic, space group C2, a=7.290(1) A, b=13.442(2) A, c=9.792(1) A, {beta}=109.60(1). NaSrB{sub 5}O{sub 9} is isostructural with another pentaborate NaCaB{sub 5}O{sub 9}, and its structure was refined by Rietveld method based on the structural model of NaCaB{sub 5}O{sub 9}. The fundamental building units are [B{sub 5}O{sub 9}]{sup 3-} anionic groups, forming complex thick anionic sheets, extending parallel to the ac plane. The Na and Sr atoms are all eight-coordinated with O atoms, forming trigonal dodecahedra. The [NaO{sub 8}] polyhedra are distributed between the B-O sheets, while the [SrO{sub 8}] polyhedra located in the sheets and connect with each other by edges to form infinite chains along the c-axis. - Graphical abstract: The subsolidus phase relations in the B-rich part of Na{sub 2}O-SrO-B{sub 2}O{sub 3} system has been investigated by powder diffraction. At the same time, two new pentaborates, NaSrB{sub 5}O{sub 9} and Na{sub 3}SrB{sub 5}O{sub 10}, have been successfully synthesized by standard solid-state reaction, and the crystal structure of NaSrB{sub 5}O{sub 9} has been refined by Rietveld method based on the structural model of NaCaB{sub 5}O{sub 9}. It crystallizes in the monoclinic space group P2{sub 1} /c with lattice parameters: a=6.4963(1) A, b=13.9703(2) A, c=8.0515(1) A, {beta}=106.900(1){sup o}. The fundamental building units are [B{sub 5}O{sub 9}]{sup 3-} anionic groups, and structure is composed of separated [BO] sheets, with Na atoms located in between the sheets and Sr atoms surrounded by the [BO] groups.},
doi = {10.1016/j.jssc.2007.02.014},
journal = {Journal of Solid State Chemistry},
number = 4,
volume = 180,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}