Hydrothermal Synthesis of Complex Fluorides LiHoF4 and LiErF4 with Scheelite Structures under Mild Conditions

Xun, X.; Feng, Shouhua; Xu, Ruren

doi:10.1016/s0025-5408(97)00240-7

Cited by 19 publications

(11 citation statements)

References 14 publications

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“…Table 1 summarizes conditions for selected complex oxides and fluorides by hydrothermal synthesis in our laboratory. [35][36][37][38][39][40][41][42][43] Perovskites, ABO 3 (A ) Ca, Sr, Ba, Pb; B ) Ti, Sn, Zr), were hydrothermally prepared; 35 complex oxides containing rare earth ions, e.g., Na x La 2/3-x/3 TiO 3 , Na x Ag y La 2/3-(x+y)/3 -TiO 3 and Na x Li y La 2/3-(x+y)/3 TiO 3 , synthesized hydrothermally at 200-240°C show enhanced electrical conductivity. 36 Further, giant magnetoresistance (GMR) materials, La 1-x A x MnO 3 (A ) Ca, Sr, and Ba), were recently synthesized from hydrothermal systems at 240°C; for example, the Ba analogue, La 0.5 Ba 0.5 MnO 3 , was obtained by heating an aqueous reaction mixture containing KMnO 4 and MnSO 4 reactants.…”

Section: Complex Oxides and Fluoridesmentioning

confidence: 99%

New Materials in Hydrothermal Synthesis

2000

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In this Account we describe the hydrothermal synthesis of some new materials including microporous crystals, ionic conductors, complex oxides and fluorides, low-dimensional aluminophosphates, inorganic-organic hybrid materials, and particularly condensed materials such as diamond and inorganic helical chains. Hydrothermal synthesis in biology and environment sciences is also introduced. The increasing interest in hydrothemal synthesis derives from its advantages in terms of high reactivity of reactants, easy control of solution or interface reactions, formation of metastable and unique condensed phases, less air pollution, and low energy consumption.

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Section: Complex Oxides and Fluoridesmentioning

confidence: 99%

New Materials in Hydrothermal Synthesis

2000

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“…Several methods have been employed to synthesize them. [8][9][10][11][12][13][14] However, there are some serious drawbacks. For example, very rigorous equipments are necessary in the solid-state reaction at high temperature, the purity of product is relatively low in precipitation method, and the reduced temperature and pressure is desired in hydrothermal method.…”

Section: -7)mentioning

confidence: 99%

Mechanochemical Syntheses of Perovskite KMIIF3 with Cubic Structure (MII = Mg, Ca, Mn, Fe, Co, Ni, and Zn)

et al. 2003

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An equi-molar mixture of potassium fluoride (KF) and one of alkaline-earth or transition metal fluoride M II F 2 (M II = Mg, Ca, Mn, Fe, Co, Ni, and Zn) was ground in air by using a planetary ball mill to investigate mechanochemical (MC) synthesis of fluoroperovskites KM II F 3 . Rietveld refinement for the ground mixtures was conducted on the basis of XRD data to inquire into structural properties of the KM II F 3 synthesized mechanochemically. The synthesis reactions proceed with grinding time, and ultimately a single phase of cubic structural KM II F 3 (Pm3m, Z ¼ 1) was obtained after grinding for 21.6 ks. The values of unit cell parameter, a, of KM II F 3 synthesized by MC reaction, are slightly larger than those by solid-state reaction at high temperature, and this may be attributed to structural distortions caused by intensive grinding.

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“…The powder was filtered, washed and decomposed under an IR lamp for one week. The resulting powder was not contaminated by N or H. Hydrothermal synthesis was carried out for the formation of LiErF 4 using both oxide and fluoride precursors [212]. The starting materials, LiF, Er 2 O 3 and NH 4 HF 2 , were added to water and sealed in a stainless steel autoclave and heated to 240ºC for 3-5 days.…”

Section: Introductionmentioning

confidence: 99%