Published November 2001 | Version v1
Journal article Metadata-only

Synthesis, crystal structure refinement and properties of perovskite-like structures based on indium

Creators

  • 1. Inst. Fiziki Vysokikh Davlenij RAN, Troitsk (Russian Federation)
  • 2. Inst. Fizicheskikh Problem RAN, Moscow (Russian Federation)
  • 3. Moskovskaya Gosudarstvennaya Akademiya Tonkoj Khimicheskoj Tekhnologii im. M.V. Lomonosova, Moscow (Russian Federation)

Description

Phases (In, Cu)Sr2YCu2O6+δ (1212) and (In, Cu)(Sr, Ho)2 (Ho, Ce)2Cu2O8+δ (1222) were synthesized in the air and oxygen media, their composition and crystal structure being refined by the Rietveld method. It was ascertained that the absence of superconductivity in indium base strontium phases stems from the low value of formal charge of copper VCu (∼2.04 for 1212 and 2.08 for 1222). Annealing in oxygen did not result in emergence of superconductivity and just promoted change in the phases cation composition. Superconductivity at Tc=80 K was recorded for 1212 type barium-containing phase of the composition (In, Cu)Ba2(Y, Ca)Cu2O6+δ with VCu∼2.15. Annealing of the phase in the air involved VCu reduction to 1.05-2.08 and disappearance of superconductivity

Abstract (Russian)

В воздушной и кислородной средах синтезированы фазы (In, Cu)Sr2YCu2O6+δ (1212) и (In, Cu)(Sr, Ho)2 (Ho, Ce)2Cu2O8+δ (1222), их состав и кристаллическая структура уточнены методом Ритвельда. Установлено, что отсутствие сверхпроводимости в стронциевых фазах на основе индия связано с малым значением формального заряда меди VCu (∼2,04 для 1212 и 2,08 для 1222). Отжиг в кислороде не привел к появлению сверхпроводимости, а способствовал только изменению катионного состава фаз. Сверхпроводимость при Тc=80 К зафиксирована у барийсодержащей фазы типа 1212 состава (In, Cu)Ba2(Y, Ca)Cu2O6+δ со значением VCu∼2,15. Отжиг этой фазы на воздухе привел к снижению VCu до 2,05-2,08 и исчезновению сверхпроводимости

Additional details

Additional titles

Original title (Russian)
Синтез, уточнение кристаллических структур и свойства перовскитоподобных фаз на основе индия

Publishing Information

Journal Title
Zhurnal Strukturnoj Khimii
Journal Volume
42
Journal Issue
6
Journal Page Range
p. 1157-1173
ISSN
0136-7463
CODEN
ZSTKAI

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
34008995
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
AIR; BARIUM COMPOUNDS; CERIUM COMPOUNDS; CHEMICAL COMPOSITION; CHEMICAL PREPARATION; CRYSTAL LATTICES; CUPRATES; ELECTRIC CONDUCTIVITY; HEAT TREATMENTS; HIGH-TC SUPERCONDUCTORS; HOLMIUM COMPOUNDS; INDIUM COMPOUNDS; LATTICE PARAMETERS; OXYGEN; PHASE STUDIES; STRONTIUM COMPOUNDS; YTTRIUM COMPOUNDS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; COPPER COMPOUNDS; CRYSTAL STRUCTURE; ELECTRICAL PROPERTIES; ELEMENTS; FLUIDS; GASES; NONMETALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SUPERCONDUCTORS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS

Optional Information

Notes
18 refs.; 8 tabs.; 7 figs.