On the Crystal Structures of HoOOH, ErOOH, and YbOOH.

Synthesis of lanthanum oxyhydroxide single crystals using an electrochemical method

“…Furthermore, all peaks of the profile of the specimen that was synthesized at 430 1C could be indexed in the hexagonal system of lanthanum oxide, La 2 O 3 . Yamamoto et al [12] reported the thermal decomposition from La(OH) 3 [20] reported that a two-step dehydration decomposition behavior was observed at 340 and 500 1C. According to these previous investigations, it is considered that the decomposition in this system occurred at each temperature as follows:…”

“…The LaOOH crystals changed into powders, and the volume ratio of LaOOH/ La(OH) 3 decreased at 20% or less within 24 h. All peaks of X-ray diffraction patterns within 48 h of synthesis were indexed by a single phase of La(OH) 3 . The decomposition could be explained by the reaction of LaOOH+H 2 OLa(OH) 3 . LaOOH is considered to be unstable in the presence of water at room temperature.…”

“…A great deal of study has been conducted on intermetallic compounds and oxides containing rare earth. Rare-earth oxyhydroxides LnOOH (Ln ¼ La, Tb, Dy, Ho, Er, Tm, Yb, Lu) have a monoclinic structure of the space group P2 1 /m and are all isostructual [1][2][3][4][5][6][7]. The thermal decomposition process of LnOOH has been investigated in detail [1,[8][9][10][11][12], but only a few magnetic and electrical properties of these compounds have been reported.…”

Short-range-order structure of amorphous hydrous erbium oxide

“…The values used in the calculation of ErOOH in Fig. 6 are those derived from the work of Christensen (1965). The density distribution of Er(OH)3 was calculated from the thermal parameters as…”

Synthesis and characterization of neodymium oxyhydroxide crystals

“…Many studies have been conducted with permanent magnets, superconductors, photoluminescence materials, hydrogen-absorbing alloys, and catalysts. Rare-earth oxyhydroxide LnOOH is one form of a rare-earth compound that has a monoclinic structure of the space group P2 1 /m [1][2][3][4][5]. LnOOH can be obtained by the thermal dehydration of hydroxide Ln(OH) 3 but it decomposes to oxide Ln 2 O 3 with an increase in the temperature.…”