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| Titel: |
Ferroelectric crystals in system PbO-GeO2-SiO2 |
| Auteur: |
Salnikov, V. D. Stephanovitch, S. Yu Chetchkin, V. V. Pentegova, M. V. Tomashpolskii, Yu Ya Venevtsev, Yu. N. |
| Verschenen in: |
Ferroelectrics |
| Paginering: | Jaargang 8 (1974) nr. 1 pagina's 491-493 |
| Jaar: |
1974 |
| Inhoud: |
Crystals of some compounds in system PbO-GeO2 and of solid solutions Pb3(Gex.Sil_x)207 were giown by the spontaneous crystallization method. A well-known ferroelectric crystal which was thought to be of a composition Pb5Ge3O11 is shown to have a more precise formula Pb3Ge2O7. For the first time the temperature dependence of pyro- and nonlinear optical characteristics is measured. The crystal does not have a centre of symmetry above Tc = 175°C right up to the melting point (730°C). Below 175°C it possesses a pyroeffect more pronounced than that of LiNbO3. A new transition from one noncentrosymmetrical modification to another one is revealed at 320°C. Dependence of Tc and lattice parameters on x has been studied for solid solutions Pb3(GexSi1_x)2O7. Conclusion is drawn that Pb3Si2O7 is a ferroelectric with Tc = -100°C. It is found that crystal Pb3GeO5 is noncentrosymmetrical and seems being in spontaneously polarized state. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 32 van 82 gevonden artikelen
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