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- Title
PbGe<sub>4</sub>O<sub>9</sub>–MGe<sub>4</sub>O<sub>9</sub> (M = Ba, Sr) and BaGe<sub>4</sub>O<sub>9</sub>–SrGe<sub>4</sub>O<sub>9</sub> Solid Solutions.
- Authors
Bush, A. A.
- Abstract
PbGe4O9–MGe4O9 (M = Ba, Sr) and BaGe4O9–SrGe4O9 samples prepared via melt solidification and by solid-state reactions were characterized by x-ray diffraction and x-ray microanalysis, and their dielectric, piezoelectric, and pyroelectric properties were studied. The results demonstrate that the presence of BaO or SrO in (1 – x)PbO · xMO · 4GeO2 starting mixtures stabilizes α-PbGe4O9 . In α-PbGe4O9 crystals, only 3% of the Pb atoms can be substituted with Ba or Sr. In BaGe4O9 and SrGe4O9 crystals, the fraction of Ba or Sr atoms substituted with Pb attains ≃ 40%. BaGe4O9 and SrGe4O9 form a continuous series of solid solutions. The ferroelectric phase transition near 140 K and the pyroelectric effect in the samples are due to the presence of α-PbGe4O9 . M1 – yPbyGe4O9 and Ba1 – xSrxGe4O9 solid solutions, isostructural with α-PbGe4O9 , possess neither ferroelectric nor pyroelectric properties.
- Subjects
SOLID solutions; LEAD; CRYSTALLIZATION; SOLIDIFICATION; X-ray microanalysis; INORGANIC chemistry; STEREOCHEMISTRY
- Publication
Inorganic Materials, 2003, Vol 39, Issue 6, p610
- ISSN
0020-1685
- Publication type
Article
- DOI
10.1023/A:1024005421074