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Title: FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS

Abstract

The formation and properties of solid solutions in the systems ZrO/sub 2/ - CeO/sub 2/, ZrO/sub 2/- Y/sub 2/O/sub 3/, and ZrO/sub 2/ - L a/sub 2/O/sub 3/ were studied. Specimens were compacted from mixtures of chemically pure oxides (70 to 95 or 20 mol% ZrO/sub 2/ and 30to 5 or 80 mol% of the second oxide) under a pressure of 500 kg/cm/sup 2/, and fired at 1400-1700 deg C. The specimens were subjected to chemical, x-ray and dilatometric analyses, and their ceramic, elastic, electrical, and physical properties were studied. At 1400 deg C the systems form solid solutions with a cubic structure. The porosity of specimens heated at 1400 deg C for 6 hrs is 30 to 40%; sintering occurs on heating to 1700- 1750 deg C for 3 hrs. In specimens containing 20 mol% CeO/sub 2/, 15 mol% Y/sub 2/O/sub 3/, or 25 mol% La/sub 2/2O/sub 3/, ZrO /sub 2/ is fully stabilized by heating to 1700-1750 deg C. Addition of CeO/sub 2/ or Y/sub 2/O/sub 3/ lowers the temperature of the polymorphic transformation of ZrO/sub 2/. New highly refractive materials can be obtained by firing to 1750 deg C the solid solutions ZrO/sub 2/-20% CeO/sub 2/, ZrO/submore » 2/-80% CeO/sub 2/, ZrO/sub 2/- 15% Y/sub 2/O/ sub 3/, ZrO/sub 2/-80% Y/sub 2/O/sub 3/ and ZrO/sub 2/- La/sub 2/O/sub 3/. Some of the materials have a lower thermal expansion coefficient and higher thermal stability (at 1200 deg C) than ZrO/sub 2/ stabilized with CaO or Mg). The highest thermal and chemical stability is exhibited by ZrO/sub 2/-Y/sub 2/O/sub 3/ solid solutions. (OTS)« less

Authors:
;
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4648795
NSA Number:
NSA-17-034453
Resource Type:
Journal Article
Journal Name:
Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.)
Additional Journal Information:
Journal Volume: Vol: No. 5; Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
METALS, CERAMICS, AND OTHER MATERIALS

Citation Formats

Leler, E L, and Andreeva, A B. FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS. Country unknown/Code not available: N. p., 1963. Web.
Leler, E L, & Andreeva, A B. FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS. Country unknown/Code not available.
Leler, E L, and Andreeva, A B. Tue . "FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS". Country unknown/Code not available.
@article{osti_4648795,
title = {FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS},
author = {Leler, E L and Andreeva, A B},
abstractNote = {The formation and properties of solid solutions in the systems ZrO/sub 2/ - CeO/sub 2/, ZrO/sub 2/- Y/sub 2/O/sub 3/, and ZrO/sub 2/ - L a/sub 2/O/sub 3/ were studied. Specimens were compacted from mixtures of chemically pure oxides (70 to 95 or 20 mol% ZrO/sub 2/ and 30to 5 or 80 mol% of the second oxide) under a pressure of 500 kg/cm/sup 2/, and fired at 1400-1700 deg C. The specimens were subjected to chemical, x-ray and dilatometric analyses, and their ceramic, elastic, electrical, and physical properties were studied. At 1400 deg C the systems form solid solutions with a cubic structure. The porosity of specimens heated at 1400 deg C for 6 hrs is 30 to 40%; sintering occurs on heating to 1700- 1750 deg C for 3 hrs. In specimens containing 20 mol% CeO/sub 2/, 15 mol% Y/sub 2/O/sub 3/, or 25 mol% La/sub 2/2O/sub 3/, ZrO /sub 2/ is fully stabilized by heating to 1700-1750 deg C. Addition of CeO/sub 2/ or Y/sub 2/O/sub 3/ lowers the temperature of the polymorphic transformation of ZrO/sub 2/. New highly refractive materials can be obtained by firing to 1750 deg C the solid solutions ZrO/sub 2/-20% CeO/sub 2/, ZrO/sub 2/-80% CeO/sub 2/, ZrO/sub 2/- 15% Y/sub 2/O/ sub 3/, ZrO/sub 2/-80% Y/sub 2/O/sub 3/ and ZrO/sub 2/- La/sub 2/O/sub 3/. Some of the materials have a lower thermal expansion coefficient and higher thermal stability (at 1200 deg C) than ZrO/sub 2/ stabilized with CaO or Mg). The highest thermal and chemical stability is exhibited by ZrO/sub 2/-Y/sub 2/O/sub 3/ solid solutions. (OTS)},
doi = {},
journal = {Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.)},
number = ,
volume = Vol: No. 5,
place = {Country unknown/Code not available},
year = {1963},
month = {1}
}