Reinvestigation of phase relations around the oxyapatite phase in the Nd2O3-SiO2 system

被引：34

作者：

Masubuchi, Y ^{[1
]}

Higuchi, M ^{[1
]}

Kodaira, K ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Div Mat Sci & Engn, Sapporo, Hokkaido 0608628, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2003年 / 247卷 / 1-2期

关键词：

phase diagrams; rare earth compounds; silicates;

D O I：

10.1016/S0022-0248(02)01908-5

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Phase relations around the oxyapatite phase in the Nd2O3-SiO2 system have been investigated by means of a slow cooling floating zone (SCFZ) method and solid-state reactions. The results on SCFZ proved that the oxyapatite phase melts congruently at the composition of Nd2O3:SiO2=7:9, corresponding to Nd-9.33(SiO4)(6)O-2. The 2:3 phase (Nd-8(SiO4)(6)), which had been believed to have an apatite structure and to melt congruently, does not exist and consists of a mixture of Nd-9.33(SiO4)(6)O-2 and Nd2Si2O7 Phases. The solid-state reaction revealed that a solid solution region of the oxyapatite phase is extremely narrow or does not exist below 1650 degreesC. (C) 2002 Elsevier Science B.V, All rights reserved.

引用

页码：207 / 212

页数：6

共 11 条

[1] Growth of apatite-type neodymium silicate single crystals by the floating-zone method [J].

Higuchi, M ;

Kodaira, K ;

Nakayama, S .

JOURNAL OF CRYSTAL GROWTH, 1999, 207 (04) :298-302

[2] Float zone growth and characterization of Pr9.33(SiO4)6O2 and Sm9.33(SiO4)6O2 single crystals with an apatite structure [J].

Higuchi, M ;

Katase, H ;

Kodaira, K ;

Nakayama, S .

JOURNAL OF CRYSTAL GROWTH, 2000, 218 (2-4) :282-286

[3] Nonstoichiometry in apatite-type neodymium silicate single crystals [J].

Higuchi, M ;

Kodaira, K ;

Nakayama, S .

JOURNAL OF CRYSTAL GROWTH, 2000, 216 (1-4) :317-321

[4] PHASE EQUILIBRIUM IN THE SYSTEM ND2O3-SIO2 [J].

MILLER, RO ;

RASE, DE .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1964, 47 (12) :653-654

[5] IONIC-CONDUCTIVITY OF LANTHANOID SILICATES, LN(10)(SIO4)(6)O-3 (LN=LA, ND, SM, GD, DY, Y, HO, ER AND YB) [J].

NAKAYAMA, S ;

KAGEYAMA, T ;

AONO, H ;

SADAOKA, Y .

JOURNAL OF MATERIALS CHEMISTRY, 1995, 5 (11) :1801-1805

[6] Oxide ionic conductivity of apatite type Nd9.33(SiO4)6O2 single crystal [J].

Nakayama, S ;

Sakamoto, M ;

Higuchi, M ;

Kodaira, K ;

Sato, M ;

Kakita, S ;

Suzuki, T ;

Itoh, K .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1999, 19 (04) :507-510

[7] Electrical properties of new type high oxide ionic conductor RE10Si6O27 (RE = La, Pr, Nd, Sm, Gd, Dy) [J].

Nakayama, S ;

Sakamoto, M .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1998, 18 (10) :1413-1418

[8] Ionic conductivities of apatite type NdX(SiO4)6O1.5X-12 (X=9.20 and 9.33) single crystals [J].

Nakayama, S ;

Sakamoto, M ;

Highchi, M ;

Kodaira, K .

JOURNAL OF MATERIALS SCIENCE LETTERS, 2000, 19 (02) :91-93

[9]

SINDO I, 1980, J CRYST GROWTH, V50, P839

[10]

Toropov N. A., 1971, Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, V7, P1220

← 1 2 →