Preparation and properties of a basic lead calcium carbonate-swelling mica complex

Motoki Uehara, Atsushi Yamazaki, Sadao Tsutsumi

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Abstract

A basic lead calcium carbonate-swelling mica complex (surite-like material, SLM), Pb2.11Ca0.83Na0.12(CO3) 2.08 (OH)1.11 (Si3.95Al0.04)Mg2.66O10 (F,OH)2·0.06H2O, was prepared by treating a swelling mica hydrothermally at 250°C with lead powder, dry ice and calcium nitrate solution. The product showed the morphology of thin hexagonal plates of 4 μm in diameter that have no swelling characteristics. Its symmetry is monoclinic; a=0.5204(3) nm, b=0.9080(9) nm, c=1.6231(8) nm, β=90.20(10)°. The X-ray powder diffraction pattern is characterized by a basal reflection of 1.62 nm and its subsequent integer reflections up to the 14th order. The chemical analysis and one dimensional Fourier synthesis results proved that SLM has an interlayer structure similar to that of natural surite, while the octahedral cation in the 2 : 1 layer consists of only Mg unlike the 2:1 layer of natural surite. The thermal behavior of SLM is similar to that of natural surite in the point that the hydroxyl in the interlayer dehydrates prior to the decomposition of the carbonate structure in the interlayer and also that the carbonate structure decomposes accompanying the collapse of the 2 : 1 layer structure.

Original languageEnglish
Pages (from-to)897-901
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume105
Issue number10
Publication statusPublished - 1997 Oct

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Keywords

  • Basic lead calcium carbonate
  • Surite
  • Swelling mica
  • Thermal behavior

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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