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Polysomatic apatites.

Tom Baikie¹, Stevin S Pramana, Cristiano Ferraris

¹Division of Materials Science and Engineering, Nanyang Technological University, Singapore. tbaikie@ntu.edu.sg

Acta Crystallographica. Section B, Structural Science

|January 27, 2010

Summary

This summary is machine-generated.

This study introduces a new family of apatite polysomes, A(5N)B(3N)O(9N + 6)X(Ndelta), built from repeating apatite modules. These complex structures offer insights into material properties and potential applications.

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Area of Science:

Solid-state chemistry and crystallography
Materials science
Mineralogy

Background:

Complex inorganic structures are often intergrowths of discrete modules.
Polysomatic series, formed by systematic variations in module proportions, are crucial for understanding defects and material properties.
Apatite structures are a well-studied class of polysomes, with hydroxyapatite being a common example.

Purpose of the Study:

To describe the polysomatic family A(5N)B(3N)O(9N + 6)X(Ndelta) (2 ≤ N ≤ ∞) built from condensing N apatite modules.
To examine the synthesis, crystallochemical design, and structural characteristics of these apatite polysomes.
To investigate the potential of these polysomes as functional materials.

Main Methods:

Description of the polysomatic series construction based on condensing N apatite modules.
X-ray and neutron powder diffraction investigations of various polysome chemical series.
Electron microscopy to examine stacking disorder.

Main Results:

Identification and characterization of the polysomatic family A(5N)B(3N)O(9N + 6)X(Ndelta), including known members like ganomalite (N=3) and nasonite (N=4).
Demonstration of the feasibility of an infinite number of polysomes with a maintained A:B cation ratio of 5:3.
Analysis of structural variations, including isolated tetrahedra (N=2) and infinite tetrahedral chains (N=∞).

Conclusions:

Apatite polysomes exhibit diverse structures based on the number of condensed modules (N).
The crystallochemical design principles of these polysomes are elucidated, guiding their development.
Insights into apatite polysome structures will facilitate their application as functional materials.