THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM
Attempts to characterize the metal-semiconductor transition in the mixed system Li//1// plus //x Ti//2// minus //x O//4 are plagued by chemical instabilities associated with a deviation from Vegard's law that is a maximum near x approximately equals 0. 1. This paper reviews the structural chemi...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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1985
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| _version_ | 1826286249815572480 |
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| author | Harrison, M Edwards, P Goodenough, J |
| author_facet | Harrison, M Edwards, P Goodenough, J |
| author_sort | Harrison, M |
| collection | OXFORD |
| description | Attempts to characterize the metal-semiconductor transition in the mixed system Li//1// plus //x Ti//2// minus //x O//4 are plagued by chemical instabilities associated with a deviation from Vegard's law that is a maximum near x approximately equals 0. 1. This paper reviews the structural chemistry to derive an energy-band model and the preparative chemistry to demonstrate surface disproportionation and chemical inhomogeneity between surface and bulk materials with the maximum instability occurring near x approximately equals 0. 09. The origin of this instability was identified; it is due to the coexistence of Ti**3** plus ions and Li** plus ions or cation vacancies on octahedral sites. The apparent critical composition x//c approximately equals 0. 1 previously reported for a metal-semiconductor transition is shown to arise from oxidation at grain boundaries. The bulk transition appears to be smooth and dependent on sample history. A proposed resolution of this problem is the existence of a spinodal decomposition into phases approaching Li left bracket Ti//2 right bracket O//4 and Li left bracket Li//1/////3Ti//5/////3 right bracket O//4 with a texture on the scale of 25 to about 500 A. |
| first_indexed | 2024-03-07T01:40:58Z |
| format | Journal article |
| id | oxford-uuid:96d37eda-dae9-42c6-95ad-ab6aa24addcc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:40:58Z |
| publishDate | 1985 |
| record_format | dspace |
| spelling | oxford-uuid:96d37eda-dae9-42c6-95ad-ab6aa24addcc2022-03-26T23:55:34ZTHE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEMJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:96d37eda-dae9-42c6-95ad-ab6aa24addccEnglishSymplectic Elements at Oxford1985Harrison, MEdwards, PGoodenough, JAttempts to characterize the metal-semiconductor transition in the mixed system Li//1// plus //x Ti//2// minus //x O//4 are plagued by chemical instabilities associated with a deviation from Vegard's law that is a maximum near x approximately equals 0. 1. This paper reviews the structural chemistry to derive an energy-band model and the preparative chemistry to demonstrate surface disproportionation and chemical inhomogeneity between surface and bulk materials with the maximum instability occurring near x approximately equals 0. 09. The origin of this instability was identified; it is due to the coexistence of Ti**3** plus ions and Li** plus ions or cation vacancies on octahedral sites. The apparent critical composition x//c approximately equals 0. 1 previously reported for a metal-semiconductor transition is shown to arise from oxidation at grain boundaries. The bulk transition appears to be smooth and dependent on sample history. A proposed resolution of this problem is the existence of a spinodal decomposition into phases approaching Li left bracket Ti//2 right bracket O//4 and Li left bracket Li//1/////3Ti//5/////3 right bracket O//4 with a texture on the scale of 25 to about 500 A. |
| spellingShingle | Harrison, M Edwards, P Goodenough, J THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title | THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title_full | THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title_fullStr | THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title_full_unstemmed | THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title_short | THE SUPERCONDUCTOR-SEMICONDUCTOR TRANSITION IN THE LI1+XTI2-XO4 SPINEL SYSTEM |
| title_sort | superconductor semiconductor transition in the li1 xti2 xo4 spinel system |
| work_keys_str_mv | AT harrisonm thesuperconductorsemiconductortransitionintheli1xti2xo4spinelsystem AT edwardsp thesuperconductorsemiconductortransitionintheli1xti2xo4spinelsystem AT goodenoughj thesuperconductorsemiconductortransitionintheli1xti2xo4spinelsystem AT harrisonm superconductorsemiconductortransitionintheli1xti2xo4spinelsystem AT edwardsp superconductorsemiconductortransitionintheli1xti2xo4spinelsystem AT goodenoughj superconductorsemiconductortransitionintheli1xti2xo4spinelsystem |