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

Kropiwnicka, J.

doi:10.1007/bf01914364

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…As also supported by the results of this work, alkali oxides are for instance more volatile than SiO 2 and tend to be lost during high temperature melting, [87][88][89] leading to an overall SiO 2 enrichment. Although quantitative estimations of the tendency of simple oxides toward thermal vaporization are available in the literature, [48][49][50] they are difficult to apply to TA B L E 3 Key melt parameters for samples LB2 and NP: Melting temperatures 96,101,102 T m , approximate viscosity 103,63 multicomponent systems. Moreover, numerous studies analyzed high-temperature evaporation in melts of geological relevance, [90][91][92] but no overarching understanding of these processes has been offered yet, especially in the case of exotic compositions.…”

Section: Discussionmentioning

confidence: 99%

Key melt properties for controlled synthesis of glass beads by aerodynamic levitation coupled to laser heating

Baborák

Yembele

Vařák

et al. 2023

Int J of Appl Glass Sci

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Binary alkali silicate glasses were synthesized as beads by aerodynamic levitation coupled to laser heating to test the applicability of the method to this compositional range. While bubble-free lithium disilicate beads could be easily obtained, sodium and potassium silicates proved more challenging to melt without significant alkali evaporation: the final samples contained bubbles and exhibited compositional drifts compared to the starting stoichiometry, especially at high SiO 2 content. The risk of volatilization from the melts was evaluated empirically: the volatility of each oxide component scaled to the ratio between its melting temperature T m and the T m of the target composition (r evap ), while the difference between such ratios (Δ evap ) provided a qualitative estimation of the risk of differential evaporation. The formulated approach enables to evaluate the suitability of aerodynamic levitation synthesis for a given target glass composition: while low melting temperature and low liquidus viscosity (η < 10 0 Pa s) represent the primary optimal conditions, more viscous materials can still be prepared without major compositional drifts using a more careful melting procedure, especially if r evap and Δ evap are minimized.

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Section: Discussionmentioning

confidence: 99%

Key melt properties for controlled synthesis of glass beads by aerodynamic levitation coupled to laser heating

Baborák

Yembele

Vařák

et al. 2023

Int J of Appl Glass Sci

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show abstract

“…High-temperature X-ray GPWT-1500 attachment installed in a GUR-5 goniometer of a DRON-2.0 diffractometer [9]. Operating conditions were used as follows: sensitivity TG -500 nag, DTA-1/5, DTG 1/10 heating rate 10 deg/min.…”

Section: Methodsmentioning

confidence: 99%

Phase equilibria in the system La2O3-Na2O-P2O5

Kropiwnicka

1990

Journal of Thermal Analysis

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In the ternary system La203-P2Os-Na20 the partial system La203-Na4LazP4015-LaPO4 has been examined by the thermal, dilatometrie X-ray and microscopic analyses and its phase diagram provided. The lanthanum oxyphosphate La3PO7 melts incongruently at the 1590~ temperature and crystallizes in a monoclinie system a = 11.20/~., b = 11.94/~, c=7.01 .~, ?= 93.79 and V = 936.97 A s.The purpose of present paper is to determine the phase diagram of the partial system La203-Na4La2P4015-LaPO4. As yet this system has not been known. It is limited from three sides by the following binary system: La203-LaPO4-; La203-Na4La2P4015; LaPO4-Na4La2P4015. The oxyphosphate with a formula La3PO7 for the first time has been obtained by Serra J. J. [1], in a solid state reaction from NH4H2PO4 and La203 at 1180 ~ and by chemical decomposition of the orthophosphate LaPO4 at a high temperature in an atmospheric pressure conditions [2]. Serra et al. [1] reported that the structures of La3PO7 and La7P3018 are monoclinic and LaTP3018 exists in lowand high -temperature forms, transforming reversibley at 1650 ~ Kizilyalli and Welch made La3PO7 by solid state reaction of LaPO4 with Na2CO3 at 700 ~ to 900 ~ [3]. Lanthanum oxyphosphate La3PO7 was found by quenching studies to have a slogish inversion at 935 ~ [4]. The oxyphosphate La3PO7 melts incongruently at 1590 ~ temperature [5,6].

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Phase equilibrium in the system LaP3O9−NaPO3−P2O5

Kropiwnicka¹

1995

Journal of Thermal Analysis

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

Cited by 3 publications

References 12 publications

Key melt properties for controlled synthesis of glass beads by aerodynamic levitation coupled to laser heating

Key melt properties for controlled synthesis of glass beads by aerodynamic levitation coupled to laser heating

Phase equilibria in the system La2O3-Na2O-P2O5

Phase equilibrium in the system LaP3O9−NaPO3−P2O5

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