{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T05:12:42Z","timestamp":1777698762677,"version":"3.51.4"},"reference-count":0,"publisher":"International Union of Crystallography (IUCr)","issue":"4","license":[{"start":{"date-parts":[[2000,8,1]],"date-time":"2000-08-01T00:00:00Z","timestamp":965088000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2000,8,1]],"date-time":"2000-08-01T00:00:00Z","timestamp":965088000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr B Struct Sci","Acta Cryst B","Acta Cryst Sect B","Acta Crystallogr B","Acta Crystallogr Sect B","Acta Crystallogr Sect B Struct Sci"],"accepted":{"date-parts":[[2000,2,4]]},"published-print":{"date-parts":[[2000,8,1]]},"abstract":"<jats:p>The Rietveld refinement on synchrotron data of three natural hydrated NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup>-exchanged phillipsites with different Si\/Al ratios allowed acceptable assignment of the NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> sites. These phillipsites display the typical monoclinic <jats:italic>P<\/jats:italic>2<jats:sub>1<\/jats:sub>\/<jats:italic>m<\/jats:italic> cell, whose volume increases with increasing numbers of NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> ions, which are refined in the two sites labelled I and II. Some residual Na<jats:sup>+<\/jats:sup> is retained in the site labelled II\u2032. Distortion of the Si\/Al tetrahedra, which affects some absorption bands in the IR spectra, seems to be mainly due to the distribution of Al in the framework, while the interaction of NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> with the O atoms of the framework seems to play a minor role. NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> in both sites acts as a donor in hydrogen bonding with O atoms of the framework and water molecules. NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> in site I has three H atoms interacting with O atoms of the framework and a number of interactions with water O atoms. In all three samples, monocentric and dicentric connections are formed. NH<jats:sub>4<\/jats:sub>\n                  <jats:sup>+<\/jats:sup> in site II has one H atom interacting with O atoms of the framework and a number of interactions with water O atoms. Two monocentric connections and a quadricentric one were found in sample (1), three dicentric connections and a monocentric one in sample (2), and three monocentric connections and a dicentric one in sample (3).<\/jats:p>","DOI":"10.1107\/s0108768100002032","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T05:09:34Z","timestamp":1027746574000},"page":"584-593","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":16,"title":["Study of NH<sub>4<\/sub>\n                  <sup>+<\/sup> in the zeolite phillipsite by combined synchrotron powder diffraction and IR spectroscopy"],"prefix":"10.1107","volume":"56","author":[{"given":"A. F.","family":"Gualtieri","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2000,8,1]]},"container-title":["Acta Crystallographica Section B Structural Science"],"original-title":[],"link":[{"URL":"http:\/\/journals.iucr.org\/b\/issues\/2000\/04\/00\/na0099\/na0099.pdf","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/journals.iucr.org\/b\/issues\/2000\/04\/00\/na0099\/na0099.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,1,10]],"date-time":"2025-01-10T13:18:53Z","timestamp":1736515133000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.iucr.org\/paper?S0108768100002032"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2000,8,1]]},"references-count":0,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2000,8]]}},"alternative-id":["S0108768100002032"],"URL":"https:\/\/doi.org\/10.1107\/s0108768100002032","relation":{"is-supplemented-by":[{"id-type":"doi","id":"10.1107\/S0108768100002032\/na0099sup1.cif","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S0108768100002032\/na00991sup2.rtv","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S0108768100002032\/na00992sup3.rtv","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S0108768100002032\/na00993sup4.rtv","asserted-by":"subject"}]},"ISSN":["0108-7681"],"issn-type":[{"value":"0108-7681","type":"print"}],"subject":[],"published":{"date-parts":[[2000,8,1]]},"assertion":[{"value":"Acta Crystallographica Section B: Structural Science","order":0,"name":"journal","label":"Publication","explanation":{"URL":"http:\/\/journals.iucr.org\/b"},"group":{"name":"general","label":"General"}},{"value":"research papers","order":1,"name":"content_type","label":"Content type","explanation":{"URL":"https:\/\/journals.iucr.org\/b\/services\/notesforauthors.html"},"group":{"name":"general","label":"General"}},{"value":"Available","URL":"http:\/\/scripts.iucr.org\/cgi-bin\/citedin?na0099","order":2,"name":"article_metrics","label":"Article metrics","group":{"name":"general","label":"General"}},{"value":"Yes","order":0,"name":"peer_reviewed","label":"Peer reviewed","group":{"name":"peer_review","label":"Peer review"}},{"value":"Single blind","order":1,"name":"review_process","label":"Review process","group":{"name":"peer_review","label":"Peer review"}},{"value":"2 August 1999","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication history"}},{"value":"4 February 2000","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication history"}},{"value":"1 August 2000","order":2,"name":"published_online","label":"Published online","group":{"name":"publication_history","label":"Publication history"}},{"value":"This article has supporting information","name":"supplementary_materials","label":"Supplementary materials","explanation":{"URL":"http:\/\/scripts.iucr.org\/cgi-bin\/sendsup?na0099"}},{"value":"\u00a9 2000 International Union of Crystallography","order":0,"name":"copyright","label":"Copyright","explanation":{"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},"group":{"name":"copyright_and_licensing","label":"Copyright and licencing"}}]}}