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Projects / Programmes source: ARIS

Structural characterization of ceramics using powder diffraction

Research activity

Code Science Field Subfield
1.04.03  Natural sciences and mathematics  Chemistry  Inorganic chemistry 

Code Science Field
P360  Natural sciences and mathematics  Inorganic chemistry 
Keywords
powder diffraction; decomposition of diffractogram; ceramics containing La, Ti, Nb, Mn, O; structure; ternary system
Evaluation (rules)
source: COBISS
Researchers (1)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  12624  PhD Amalija Golobič  Chemistry  Head  2002 - 2004  359 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0103  University of Ljubljana, Faculty of Chemistry and Chemical Technology  Ljubljana  1626990  23,092 
Abstract
We will investigate structures and solid solubility in ternary systems of metal oxides of La, Ti and Nb or Mn. Structures will be determined by using powder diffraction methods. Diffraction data will be collected on the high-resolution powder diffractometer Siemens at National Institute of Chemistry, Ljubljana at room, low and (if necessary) high temperature. Two dimensional powder diffractograms will be collected by diffractometers MAR with area detectors (image plate with diameter 345 mm and CCD plate with diameter 165 mm) at room and low temperature at Synchrotron Elettra in Trieste. Data collection at different temperatures will be done in order to apply differential (anisotropic) thermal contraction of the unit cell with the aim of improving of partitioning at decomposition of intensities by experimental means. The principle of this method is already known. Nevertheless, the method was used very rarely until now. Our goal is, not only to improve the quality of the reflection data in order to to have less problems with the structure solution. We also wish to revive this method and adapt it into more user-friendly form which would be suitable also for other types of compounds. The solving and refinement of the structures will be done by conventional powder methods and by using well-known programs. Besides the determination of the structural parameters (unit cell and atomic parameters) we will also examine the structure motif and look for similarities and differences among the structures of the same ternary system and related systems. We also wish to examine the relationship between the structure of the particular compound and its physical (i.e. dielectric and thermal) properties since these compounds belong to a class of technologically important microwave ceramics.
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