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Ba<jats:sub>2<\/jats:sub>YAlO<jats:sub>5<\/jats:sub> was found to have a monoclinic crystal structure, with lattice parameters <jats:italic>a<\/jats:italic>\u00a0= 7.2333\u2005(7), <jats:italic>b<\/jats:italic>\u00a0= 6.0254\u2005(5), <jats:italic>c<\/jats:italic>\u00a0= 7.4294\u2005(7)\u2005\u00c5 and \u03b2\u00a0= 117.249\u2005(3)\u00b0, and to belong to the space group <jats:italic>P<\/jats:italic>2<jats:sub>1<\/jats:sub>\/<jats:italic>m<\/jats:italic>, while \u03b1-Ba<jats:sub>6<\/jats:sub>Y<jats:sub>2<\/jats:sub>Al<jats:sub>4<\/jats:sub>O<jats:sub>15<\/jats:sub> was determined to be monoclinic, with <jats:italic>a<\/jats:italic>\u00a0= 5.9019\u2005(2), <jats:italic>b<\/jats:italic>\u00a0= 7.8744\u2005(3), <jats:italic>c<\/jats:italic>\u00a0= 9.6538\u2005(3)\u2005\u00c5 and \u03b2\u00a0= 107.7940\u2005(10)\u00b0, and the space group <jats:italic>Pm<\/jats:italic>, and \u03b2-Ba<jats:sub>6<\/jats:sub>Y<jats:sub>2<\/jats:sub>Al<jats:sub>4<\/jats:sub>O<jats:sub>15<\/jats:sub> was found to be monoclinic, with <jats:italic>a<\/jats:italic>\u00a0= 7.8310\u2005(2), <jats:italic>b<\/jats:italic>\u00a0= 5.8990\u2005(2), <jats:italic>c<\/jats:italic>\u00a0= 18.3344\u2005(6)\u2005\u00c5 and \u03b2\u00a0= 91.6065\u2005(11)\u00b0, and the space group <jats:italic>P<\/jats:italic>2\/<jats:italic>c<\/jats:italic>. In each of these compounds, <jats:italic>B<\/jats:italic>O<jats:sub>6<\/jats:sub> octahedra in <jats:italic>AB<\/jats:italic>O<jats:sub>3<\/jats:sub> perovskite-type structures were replaced by AlO<jats:sub>4<\/jats:sub> tetrahedra and YO<jats:sub>6<\/jats:sub> octahedra. Polycrystalline samples in which some Y atoms were replaced with Eu exhibited orange\u2013red luminescence in the range 580\u2013730\u2005nm in response to exposure to radiation having a wavelength of approximately 250\u2005nm.<\/jats:p>","DOI":"10.1107\/s2053229623008860","type":"journal-article","created":{"date-parts":[[2023,10,17]],"date-time":"2023-10-17T17:00:37Z","timestamp":1697562037000},"page":"464-471","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":3,"title":["Perovskite-related structures of Ba<sub>2<\/sub>YAlO<sub>5<\/sub> and the \u03b2 and \u03b1 phases of Ba<sub>6<\/sub>Y<sub>2<\/sub>Al<sub>4<\/sub>O<sub>15<\/sub> containing AlO<sub>4<\/sub> tetrahedra"],"prefix":"10.1107","volume":"79","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1760-4030","authenticated-orcid":true,"given":"Rayko","family":"Simura","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yamato","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7931-5210","authenticated-orcid":true,"given":"Hisanori","family":"Yamane","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2023,10,17]]},"reference":[{"key":"op3025_bb1","doi-asserted-by":"crossref","first-page":"828","DOI":"10.1107\/S0108767399002068","volume":"55","author":"Abakumov","year":"1999","journal-title":"Acta Cryst. 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