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Structure and Properties of Rapidly Quenched Li 2 O‐Al 2 O 3 ‐Nb 2 O5 Glasses
Author(s) -
TATSUMISAGO MASAHIRO,
HAMADA AKIRA,
MINAMI TSUTOMU,
TANAKA MASAMI
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb11007.x
Subject(s) - octahedron , analytical chemistry (journal) , chemical composition , ion , quenching (fluorescence) , crystallography , aluminium , materials science , chemistry , niobium , nuclear chemistry , fluorescence , mineralogy , crystal structure , metallurgy , organic chemistry , chromatography , quantum mechanics , physics
In the system Li 2 O‐A1 2 O 3 ‐Nb 2 O 5 , glasses were prepared in a wide range of compositions using a twin‐roller quenching technique. The glass‐transition temperature, ranging from 495° to 780°C, was primarily determined by the Li 2 O content and was independent of the Al 2 O 3 and Nb 2 O 5 contents in the composition region with the Li 2 O/Nb 2 O 5 ratio smaller than unity, whereas it increased with the replacement of Nb 2 O 5 by A1 2 O 3 in the region of the ratio larger than unity. Although the conductivity, ranging from 10 ‐9 to 10 ‐5 Ω ‐1 cm ‐1 at 500 K, was also primarily determined by the Li 2 O content, it tended to decrease slightly as Nb 2 O 5 was replaced by A1 2 O 3 in glasses containing a given Li 2 O 5 content; such a tendency was pronounced in the composition region with the Li 2 O/Nb 2 O 5 ratio larger than unity. Ir spectra and the chemical shifts of AIKα X‐ray fluorescence lines of the glasses revealed that aluminum ions in the glasses with the Li 2 O/Nb 2 O 5 ratio smaller than unity were mainly in the octahedral coordination state, Aloe, and that, when the ratio exceeded unity, the amount of the tet‐rahedrally coordinated aluminum ions AlO 4 increased with increasing Li 2 O/Nb 2 O 5 ratio.