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vti_cachedhasborder:BR|false vti_metatags:VR|HTTP-EQUIV=Content-Type text/html;\\ charset=iso-8859-1 citation_author El-Azzabi\\ O.\\ H citation_author Shakshooki\\ S.\\ K. citation_author Benomran\\ M. citation_author Suliman\\ Y.\\ A. citation_title Synthesis\\ ,\\ Characterization\\ and\\ Electrical\\ Properties\\ of\\ Intercalated\\ Mixed\\ Metal\\ Ions\\ Cu²⁺-mn²⁺\\ and\\ Cu²⁺zn²⁺\\ A-vanadyl\r\r\nHydrogen\\ Phosphate\\ Hemihydrate\\ Products citation_pdf_url http://www.sjpub.org/sjp/sjp-110.pdf citation_year 2012 citation_online_date 2012 citation_journal_title Science\\ Journal\\ of\\ Physics citation_abstract \r\r\n Cu_0.25-\\ Mn_0.25\\ VOPO₄\\ .4H₂O\\ (Cu-MnVPO)\\ and\\ Cu_0.30\\ -Zn_0.19\\ H_0.01\r\r\nVOPO₄\\ 1.8\\ H₂O\\ (Cu-ZnVPO)\\ have\\ been\\ prepared\\ from\\ reactions\\ of\r\r\nmixtures\\ Cu²⁺-Mn²⁺\\ and\\ Cu²⁺-Zn²⁺\\ metal\\ ions\\ with\\ VOHPO₄.0.5H₂O.\r\r\nThey\\ were\\ characterized\\ by\\ chemical,\\ thermal\\ analysis,\\ X-ray\r\r\npowder\\ diffraction\\ and\\ by\\ FT-IR\\ spectroscopy.\\ Their\\ conductivity\r\r\ndeterminations\\ were\\ made\\ by\\ ac-method\\ at\\ temperature\\ ranges\r\r\n(25\\ -85°C)\\ on\\ compact\\ discs\\ using\\ silver\\ paste\\ as\\ electrodes.\r\r\nThe\\ variation\\ of\\ the\\ ac\\ conductivity\\ as\\ a\\ function\\ of\\ frequency\\ in\r\r\nthe\\ range\\ 10Hz\\ -\\ ¹⁰KH\\ was\\ also\\ studied\\ .\\ For\\ the\\ compound\r\r\nCuZnVPO,\\ it\\ is\\ observed\\ that\\ ac\\ conductivity\\ increases\\ with\r\r\nincreasing\\ temperature\\ from\\ room\\ temperature\\ up\\ to\\ 57°C\\ ,\\ then\r\r\nanother\\ phase\\ starts\\ to\\ form\\ .\\ In\\ the\\ range\\ of\\ 57-85°C\\ ,\\ the\\ ac\r\r\nconductivity\\ reaches\\ its\\ maximum\\ value,\\ 9.4X10^-4\\ mho\\ m^-1,\\ and\r\r\nthen\\ remains\\ constant.\\ In\\ case\\ of\\ CuMnVPO,\\ the\\ conductivity\r\r\nreaches\\ its\\ minimum\\ value\\ 5.5X10^-4\\ mho\\ m^-1.\\ The\\ ac\\ conductivity\r\r\ndecreases\\ with\\ increasing\\ temperature\\ up\\ to\\ the\\ transition\\ point\r\r\n72°C,\\ where\\ a\\ new\\ phase\\ starts\\ to\\ forms\\ and\\ the\\ conductivity\r\r\nremains\\ constant.\\ The\\ activation\\ energies\\ for\\ CuMnVPO\\ and\r\r\nCuZnVPO,\\ were\\ calculated\\ in\\ the\\ range\\ 25°C\\ to\\ transition\\ point\r\r\nand\\ found\\ to\\ be\\ 0.19,\\ 0.12\\ (Ev) dc.rights http://creativecommons.org/licenses/by/3.0/ citation_volume 2012 citation_publisher Science\\ Journal\\ Publication citation_issn 2276-6367 citation_abstract_html_url http://www.sjpub.org/sjp/abstract/sjp-110.html vti_charset:SR|iso-8859-1