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The structure and crystallography of the pyrophosphate compounds were identified and confirmed by using X-ray diffraction (XRD). The Rietveld refinement method and the extended X-ray absorption fine structure (EXAFS) least-squares fitting technique were also applied to refine the sample crystal structure. The single phases of the obtained Ca<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, CaCuP<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, and Cu<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> samples and the mixing phases of the obtained Ca<jats:sub>1.5<\/jats:sub>Cu<jats:sub>0.5<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> and Ca<jats:sub>0.5<\/jats:sub>Cu<jats:sub>1.5<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> samples were identified, and then only a single phase of the samples was subjected to structural and dielectrical analyses. The structural results exhibit the tetragonal crystal system with the <jats:italic>P4<\/jats:italic><jats:sub><jats:italic>1<\/jats:italic><\/jats:sub> space group for <jats:italic>\u03b2<\/jats:italic>-Ca<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, the monoclinic crystal system with the <jats:italic>P2<\/jats:italic><jats:sub><jats:italic>1<\/jats:italic><\/jats:sub><jats:italic>\/c<\/jats:italic> space group for CaCuP<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, and the <jats:italic>C<\/jats:italic>2\/<jats:italic>c<\/jats:italic> space group for <jats:italic>\u03b1<\/jats:italic>-Cu<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>. The dielectric constant (<jats:italic>\u03b5<\/jats:italic><jats:sub>r<\/jats:sub>) of the single metal pyrophosphates (Ca<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> and Cu<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>) was higher than that of binary metal pyrophosphates (CaCuP<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>). The image sensor result of the Cu<jats:sub>2<\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> sample (<jats:italic>x<\/jats:italic>\u2009=\u20092.00) illustrated a yellowish-green color, while other compounds (<jats:italic>x<\/jats:italic>\u2009=\u20090.50\u22121.50) presented color tones that changed from blue-green to bluish-green. Raman and Fourier transform infrared (FTIR) spectrophotometers were employed to characterize and confirm the vibrational characteristics of the P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub><jats:sup>4\u2212<\/jats:sup> group, which contains the O\u2013P\u2013O radical ([PO<jats:sub>2<\/jats:sub>]<jats:sup>-<\/jats:sup>) and the P\u2013O\u2013P bride ([OPO]<jats:sup>-<\/jats:sup>) and approximate M\u2013O stretching modes. Furthermore, this work reports for the first time that the change in the crystal structure of Ca<jats:sub>2\u2212<jats:italic>x<\/jats:italic><\/jats:sub>Cu<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> (i.e., bond angle of P\u2212O\u2212P in P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub><jats:sup>4\u2212<\/jats:sup> and distortion phenomena in the <jats:italic>M<\/jats:italic>\u2212O<jats:sub>6<\/jats:sub> octahedral site) are cause the correlation between the structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca<jats:sub>2\u2212<jats:italic>x<\/jats:italic><\/jats:sub>Cu<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>.<\/jats:p>","DOI":"10.1038\/s41598-022-11056-4","type":"journal-article","created":{"date-parts":[[2022,4,27]],"date-time":"2022-04-27T11:02:55Z","timestamp":1651057375000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Correlation between structure, chromaticity, and dielectric properties of calcium copper pyrophosphates, Ca2\u2212xCuxP2O7"],"prefix":"10.1038","volume":"12","author":[{"given":"Rattanai","family":"Baitahe","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuchai","family":"Sronsri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Somphob","family":"Thompho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kittichai","family":"Chaiseeda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nattaya","family":"Montri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Banjong","family":"Boonchom","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,4,27]]},"reference":[{"key":"11056_CR1","doi-asserted-by":"publisher","first-page":"1801","DOI":"10.1007\/s10853-005-0698-4","volume":"40","author":"J Bian","year":"2005","unstructured":"Bian, J., Kim, D. & Hong, K. 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