Title: Thermochemistry of sodium rare earth ternary fluorides, NaREF4

Journal Article · · Acta Materialia
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]
  1. Arizona State University, Tempe, AZ (United States); University of California, Davis, CA (United States)
  2. OLI Systems, Inc., Parsippany, NJ (United States)
  3. State University of New Jersey, Piscataway, NJ (United States)
  4. Arizona State University, Tempe, AZ (United States)

Sodium rare earth fluorides, NaREF4 (RE = rare earth), are used as luminescent materials for light emission and biomedical applications and are important compositions for extracting and separating RE elements. Solution calorimetric measurements of a series of β-structured NaREF4 (Na1.5RE1.5F6) phases with various RE elements determined their heats of formation. Though the lattice contracts from light to heavy RE elements, NaREF4 compounds show more exothermic enthalpies of formation from binary components with the decrease of RE3+ radii, contrary to behavior seen in most RE oxide ternary compounds. Furthermore, by constructing Born–Haber cycles, the different slopes of lines relating lattice energies to lattice parameters in binary and ternary fluorides appear to be the reason for this reverse trend, which can be associated with changes in the coordination number of RE cations. These trends and the metastability of sodium light RE fluorides not only reveal the key role of ionic radius in RE compound stability, but also are significant for the design and synthesis of new materials and motivate the more effective utilization of RE.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States). Critical Materials Institute (CMI)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1981521
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 220; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (40)

Down- and Up-Conversion Luminescent Nanorods journal September 2007
A Calorimetric Study of the Lanthanide Aluminum Oxides and the Lanthanide Gallium Oxides: Stability of the Perovskites and the Garnets journal December 1998
Progress and new directions in high temperature calorimetry journal January 1977
Lanthanide oxides: Thermochemical approach to hydration journal April 1987
Progress and new directions in high temperature calorimetry revisited journal April 1997
Rare earth elements in hydrothermal systems: Estimates of standard partial molal thermodynamic properties of aqueous complexes of the rare earth elements at high pressures and temperatures journal November 1995
The standard enthalpies of formation of hydroxides IV. La(OH)3 and LaOOH journal May 1990
Standard thermodynamic properties and heat capacity equations of rare earth hydroxides: journal October 1998
Thermodynamics of high entropy oxides journal January 2021
Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate journal March 2015
Thermodynamics of solid phases containing rare earth oxides journal September 2015
Phase formation in LaF3–NaGdF4, NaGdF4–NaLuF4, and NaLuF4–NaYF4 systems: Synthesis of powders by co-precipitation from aqueous solutions journal May 2014
Formation enthalpies of rare earth titanate pyrochlores journal June 2004
Enthalpies of formation of rare earth orthovanadates, REVO4 journal March 2007
Formation enthalpies and heat capacities of rear earth titanates: RE2TiO5 (RE=La, Nd and Gd) journal March 2012
Formation enthalpies of LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) interlanthanide perovskites journal July 2015
Thermochemistry of rare earth oxyhydroxides, REOOH (RE = Eu to Lu) journal July 2020
Energetics of Formation and Disordering in Rare Earth Weberite RE 3 TaO 7 Materials journal November 2019
Recent Progress in Rare Earth Micro/Nanocrystals: Soft Chemical Synthesis, Luminescent Properties, and Biomedical Applications journal December 2013
Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides journal August 2014
The Binary Rare Earth Oxides journal June 1998
The Sodium Fluoride-Lanthanide Trifluoride Systems journal July 1966
High-Quality Sodium Rare-Earth Fluoride Nanocrystals:  Controlled Synthesis and Optical Properties journal May 2006
Effect of Structure and Thermodynamic Stability on the Response of Lanthanide Stannate Pyrochlores to Ion Beam Irradiation journal February 2006
Oxide melt solution calorimetry of rare earth oxides journal July 2002
Simultaneous phase and size control of upconversion nanocrystals through lanthanide doping journal February 2010
Giant nonlinear optical responses from photon-avalanching nanoparticles journal January 2021
Lanthanide-doped inorganic nanoparticles turn molecular triplet excitons bright journal November 2020
Energetics of lanthanide cobalt perovskites: LnCoO 3−δ (Ln = La, Nd, Sm, Gd) journal January 2015
Phase and morphology evolution of luminescent NaLnF 4 (Ln = La to Yb) micro-crystals: understanding the ionic radii and surface energy-dependent solution growth mechanism journal January 2019
Crystal structures and stability of NaLnF4 (Ln = La, Ce, Pr, Nd, Sm and Gd) studied with synchrotron single-crystal and powder diffraction journal January 2012
The Thermodynamic Properties of the f -Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides journal March 2014
GSAS-II : the genesis of a modern open-source all purpose crystallography software package journal March 2013
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides journal September 1976
Progress and New Directions in Calorimetry: A 2014 Perspective journal October 2014
Thermodynamic assessment of BaO–Ln 2 O 3 (Ln = La, Pr, Eu, Gd, Er) systems journal February 2020
Thermochemistry of rare-earth orthophosphates journal September 2001
Enthalpies of formation of rare earth niobates, RE 3 NbO 7 journal July 2015
Thermodynamics of bastnaesite: A major rare earth ore mineral journal May 2016
Trends in Structure and Thermodynamic Properties of Normal Rare Earth Carbonates and Rare Earth Hydroxycarbonates journal March 2018