BS IS0 21820:2021 BSl Standards Publication Fine ceramics (advanced ceramics, advanced technical ceramics) Ultraviolet photoluminescence image test method for analysing polytypes of boron- and nitrogen-doped SiC crystals bsi. BSISO21820:2021 BRITISH STANDARD Nationalforeword This British Standard is theUK implementation of IS021820:2021. The UK participation in its preparation was entrusted to Technical Committee RPI/13,Advancedtechnical ceramics. A list of organizations represented on this committee can be obtained on requesttoits committeemanager. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. TheBritishStandards Institution2021 Published byBSI StandardsLimited 2021 ISBN978058096048 2 ICS81.060.30 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Amendments/corrigendaissuedsincepublication Date Textaffected BS ISO 21820:2021 ISO INTERNATIONAL STANDARD 21820 First edition 2021-02 Fine ceramics (advanced ceramics, advanced technical ceramics) - Ultraviolet photoluminescence image test method for analysing polytypes of boron- and nitrogen-doped SiC crystals Ceramiques techniques-Methode d'imageriede photoluminescence ultraviolette pour I'analyse des polytypes dans les cristaux de Sic dopésal'azoteetaubore Referencenumber IS0 21820:2021(E) ISO @ ISO 2021