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Thermal Reactions of Hydrated Hexagonal RPO 4· n H 2 O (R=Tb or Dy, n =0.5 to 1)
Author(s) -
Hikichi Yasuo,
Sasaki Toshio,
Suzuki Suguru,
Murayama Kyouhei,
Miyamoto Masaaki
Publication year - 1988
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.1151-2916.1988.tb05940.x
Subject(s) - anhydrous , hexagonal crystal system , crystallography , materials science , atmospheric pressure , lanthanide , thermal , chemistry , thermodynamics , ion , organic chemistry , oceanography , physics , geology
The thermal reactions of hydrated hexagonal RPO 4·n H 2 O (R=Tb or Dy, n=0.5 to 1) were studied at 20° to 1800°C in air under atmospheric pressure. The hydrated hexagonal forms were dehydrated at 180° to 250°C. Thereafter, no significant changes in structure were seen up to 800°C (R=Tb) or 700°C (R=Dy). The water corresponding to nH 2 O was zeolitic water. Anhydrous hexagonal RPO 4 gradually transformed into the monazite structure at 900°C (R=Tb) or 800°C (R=Dy), then into the xenotime structure at temperatures above 1100°C (R=Tb) or 900°C (R=Dy).
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