Published January 2004 | Version v1
Journal article Metadata-only

Order-disorder transformations in Ln2Ti2O7 (Ln - Lu, Yb, Tm, Gd)

Creators

  • 1. RAN, Inst. Khimicheskoj Fiziki im. N.N. Semenova, Moscow (Russian Federation)
  • 2. Inst. Biokhimicheskoj Fiziki im. Ehmmanuehlya, Moscow (Russian Federation)

Description

Aimed at possible detection of low temperature modifications of Ln2Ti2O7 with a fluorite structure the codeposited products at Ln : Ti = 1 : 1 (Ln - Lu, Yb, Tm) are studied in a temperature range of 350-950 Deg C. A search for a high temperature pyrochlore → fluorite phase transition in compounds mentioned is carried out at 1400-1700 Deg C. It is shown that for the first time in Ln2Ti2O7 compounds a low temperature fluorite ↔ pyrochlore transition at ∼ 800 Deg C is revealed. A range of low temperature fluorite stability is 600-800 Deg C. For Ln2Ti2O7 at 1700 Deg C a high temperature pyrochlore → fluorite transition is assumed to exist. The formation of phases with fluorite structure escaped detection

Abstract (Russian)

Исследованы продукты соосаждения при Ln : Ti = 1 : 1 (Ln - Lu, Yb, Tm) в области температур 350-950 град С с целью возможного обнаружения низкотемпературных модификаций Ln2Ti2O7 со структурой флюорита. Проведен поиск высокотемпературного фазового перехода пирохлор → флюорит в указанных соединениях при 1400-1700 град С. Показано, что для соединений Ln2Ti2O7 впервые обнаружен низкотемпературный переход флюорит ↔ пирохлор при ∼ 800 град С. Предполагается существование высокотемпературного перехода пирохлор → флюорит для Ln2Ti2O7 при 1700 град С. Не обнаружено образования фаз со структурой флюорита

Additional details

Additional titles

Original title (Russian)
Исследование превращений пораыдок-беспорядок в соединениях Лн

Publishing Information

Journal Title
Neorganicheskie Materialy
Journal Volume
40
Journal Issue
1
Journal Page Range
p. 67-74
ISSN
0002-337X
CODEN
NEOMB8

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
36106815
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CERAMICS; LUTETIUM OXIDES; ORDER-DISORDER TRANSFORMATIONS; PERMITTIVITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 1000-4000 K; THULIUM OXIDES; TITANIUM OXIDES; X-RAY DIFFRACTION; YTTERBIUM OXIDES
Descriptors DEC
CHALCOGENIDES; COHERENT SCATTERING; DIELECTRIC PROPERTIES; DIFFRACTION; ELECTRICAL PROPERTIES; LUTETIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; TEMPERATURE RANGE; THULIUM COMPOUNDS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; YTTERBIUM COMPOUNDS

Optional Information

Notes
17 refs., 12 figs., 3 tabs.