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The enthalpies of mixing of the liquid mixtures of (NaBO 2 ) 2  + B 2 O 3  , Na 4 P 2 O 7  + (NaPO 3 ) 2  , (NaPO 3 ) 2  + B 2 O 3  and Na 4 P 2 O 7  + (NaBO 2 ) 2  have been measured by liquid + liquid calorimetry. The results are discussed in terms of tentative structural models of the melts, and in terms of O 2-  ion transfers from phosphorus groups to boron groups in (NaPO 3 ) 2  + B 2 O 3  and from boron groups to phosphorus groups in Na 4 P 2 O 7  + (NaBO 2 ) 2  .

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Thermodynamics of the Ternary System Na 2 O—P 2 O 5  —B 2 O 3: I. A Calorimetric Study of the Liquid Mixtures B 2 O 3  + (NaBO 2 ) 2 , (NaPO 3  ) 2  + Na 4 P 2 O 7 , (NaPO 3 ) 2  + B 2 O 3  and Na 4 P 2 O 7  + (NaBO 2 ) 2