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Phase equilibria in the system La2O3-Na2O-P2O5: Binary phase diagram La(PO3)3-NaPO3

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Abstract

In the ternary system La2O3-Na2O-P2O5, the binary system La(PO3)3-NaPO3 was examined by means of thermal (heating and cooling), dilatometric, X-ray powder diffraction and microscopic analyses. The occurrence of the phosphate NaLaP4O12 was confirmed and its temperature of congruent melting was determined to be 1174 ‡C. The powder data indicate a monoclinic system with the lattice constantsa=12.36(6);b=13.45(0);c=6.57(4) å; γ=109.48‡;V=1030.97 å3. The investigations were carried out on monocrystals.

Zusammenfassung

Das binäre Teilsystem La(PO3)3-NaPO3 des ternären Systemes La2O3-Na2O-P2O5 wurde mittels thermischer, dilatometrischer, Röntgendiffraktions- und mikroskopischen Methoden untersucht. Es wurde die Existenz des Phosphates NaLaP4O12 und dessen kongruenter Schmelzpunkt von 1174 ‡C festgestellt. Die Röntgendiffraktionsaufnahmen lassen auf ein monoklines System mit den Gitterkonstantena=12,36(6),b=13,45(0),c=6,57(4) å,γ=109,48‡ undV=1030,87 å3 schliessen. Die Untersuchungen wurden an Einkristallen durchgeführt.

РЕжУМЕ

с пОМОЩьУ тЕРМИЧЕскО гО (НАгРЕВАНИЕ И ОхлАжДЕНИЕ), ДИлАтОМЕ тРИЧЕскОгО, РЕНтгЕНОФАжОВОгО И М ИкРОскОпИЧЕскОгО АН АлИжОВ ИсслЕДОВАНА БИНАРНА ь сИстЕМА La(PO3)3-NaPO3, ОБРАжУУЩАьсь В тР ОИНОИ сИстЕМЕ La2O3-Na2O-P2O5. пОДтВЕРжДЕНО ОБ РАжОВАНИЕ БЕжВОДНОгО пОлИФОсФ АтА NaLaP4O12, плАВьЩЕгОсь кОНгРУЁНтНО пРИ 1174‡. ДА ННОЕ сОЕДИНЕНИЕ НАхОДИтс ь В тРЕх пОлИМОРФНых М ОДИФИкАцИьхγ-, Β- И А-пРИ тЕМпЕРАтУР Ах, сООтВЕтстВЕННО, 350, 750 И 840‡. пОлИФОсФАт NaLaP4O12 кРИстАллИжУЕтсь В МО НОклИННОИ сИНгОНИИ с пАРАМЕтРА МИ РЕшЕткИa=12,36 å,b=13,45 å,с=6,57 å,γ=109,48‡ ИV=1030,97 å3. БИНАРНАь сИстЕМА ОБР АжУЕт ДВЕ ЁВтЕктИкИ п РИ тЕМпЕРАтУРАх 500 И 820. МЕтА ФОсФАт лАНтАНА La(PO3)3 плАВИтсь ИНкОНгРУ ЁНтНО пРИ 1050‡, А пРИ 820‡ —пР ЕтЕРпЕВАЕтα-, Β-пОлУМОРФНОЕ пРЕВРАЩЕНИЕ. ДОБАВлЕ НИЕ 2–2,5 ВЕсОВых % лАНтАН ОНАтРИЕВых ФОсФАтОВ УВЕлИЧИВАЕ т тЕРМИЧЕскИИ ЁФФЕкт т АкОгО пОлИМОРФНОгО п РЕВРАЩЕНИь.

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  1. Department of Inorganic Chemistry, Academy of Economics, Wrocław, Poland

    J. Kropiwnicka

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The author thank Dr. T. Znamierowska and Dr. J. Matuszewski for helpful discussions and G. Orczykowska for translation of the text. This work was supported by grant CPBP-01.18.

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Kropiwnicka, J. Phase equilibria in the system La2O3-Na2O-P2O5: Binary phase diagram La(PO3)3-NaPO3 . Journal of Thermal Analysis 34, 1405–1412 (1988). https://doi.org/10.1007/BF01914364

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