Published 1985
| Version v1
Journal article
Neutron diffraction study of ferroelectric transition in Li2Ge7O15
- 1. Kyoto Univ., Kumatori, Osaka (Japan). Research Reactor Inst.
Description
The crystal structure of Li2Ge7O15 in its ferroelectric state has been determined and refined as well with an R-value of 0.063 for 1202 neutron diffraction data. The crystal belongs to the orthorhmbic system with space group C2v5-Pbc21 and unit cell dimensions a = 7.36, b = 16.66 and c = 9.69 A (at 77 K). Atomic displacements at the phase transition (283.5 K) are evaluated in comparison with the paraelectric structure determined by Voellenkle et al., in 1970. Consequently, tiltings of GeO4 tetrahedra closely related to the soft phonon mode observed by Raman scattering and far-infrared measurements have clearly been observed. (author)
Additional details
Publishing Information
- Journal Title
- Jpn. J. Appl. Phys., Suppl.
- Journal Volume
- 24
- Journal Issue
- 2
- Series
- Jpn. J. Appl. Phys., Suppl.
- Journal Page Range
- 597-599
- ISSN
- 0021-4922
- CODEN
- JJPYA
Conference
- Title
- 6. international meeting on ferroelectricity.
- Dates
- 12-16 Aug 1985.
- Place
- Kobe (Japan).
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 18015776
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CRYSTAL STRUCTURE; FERROELECTRIC MATERIALS; GERMANIUM OXIDES; LITHIUM OXIDES; LOW TEMPERATURE; MONOCRYSTALS; NEUTRON DIFFRACTION; PHASE TRANSFORMATIONS
- Descriptors DEC
- ALKALI METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTALS; DIELECTRIC MATERIALS; DIFFRACTION; GERMANIUM COMPOUNDS; LITHIUM COMPOUNDS; MATERIALS; OXIDES; OXYGEN COMPOUNDS; SCATTERING