Novel insight into the structure and properties of lead-free dielectric Sr3TiNb4O15

Sr 3 TiNb 4 O 15 has been synthesised and its structure and dielectric properties characterised. In contrast to previously reported results the compound has been found to form with Pna 2 1 symmetry and unit cell dimensions a = 12.3631(19), b = 12.4027(19) and c = 7.7601(12) Å. Variable temperature s...

Full description

Saved in:
Bibliographic Details
Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 6; no. 33; pp. 889 - 8896
Main Authors Whittle, Thomas A, Brant, William R, Withers, Ray L, Liu, Yun, Howard, Christopher J, Schmid, Siegbert
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Dielectric properties
Lead free
Phase transitions
Symmetry
Temperature dependence
Transition temperature
Unit cell
Online AccessGet full text

Cover

More Information
Summary:Sr 3 TiNb 4 O 15 has been synthesised and its structure and dielectric properties characterised. In contrast to previously reported results the compound has been found to form with Pna 2 1 symmetry and unit cell dimensions a = 12.3631(19), b = 12.4027(19) and c = 7.7601(12) Å. Variable temperature studies show a phase transition from orthorhombic to tetragonal symmetry at approximately 625 K, much higher than previously reported. Temperature-dependent dielectric measurements have also been performed and these correlate very well with the observed phase transition temperature. The octahedral tilting approach used in this study will be useful for many more tungsten-bronze-type structures with similar pseudo-symmetry problems.
ISSN:2050-7526
2050-7534
2050-7534
DOI:10.1039/c8tc00732b