Single-Crystal Growth and Structure Determination of a New Oxide Apatite, NaLa9(GeO4)6O2

Takahashi, Masaru; Uematsu, Kazuyoshi; Ye, Zuo‐Guang; Sato, Mineo

doi:10.1006/jssc.1998.7845

Cited by 44 publications

(23 citation statements)

References 8 publications

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“…The Sr(1) atoms at the 4f sites are coordinated with nine O atoms. It is linked to O(3) over a relatively large distance, such that the 4f cations can also be regarded as being in six-fold coordination; the environment of these cations is distorted from that of an ideal octahedron [24]. Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…These results showed that the Eu 3+ ions preferred to occupy a predominant site than others at high concentration. The Sr(1) site is an ionic site, whereas the La(2) site is a covalent site, as determined from the bond valence sums in the germinate apatite structure [24]. La(2) O(4) bonds with the smallest bond valence sums have the highest degree of covalency.…”

Section: Resultsmentioning

confidence: 99%

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Luminescent properties of Eu-doped germanate apatite Sr2La8(GeO4)O2

Li¹,

Chang²,

Tsai³

et al. 2006

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Luminescent properties of Eu-doped germanate apatite Sr2La8(GeO4)O2

Li¹,

Chang²,

Tsai³

et al. 2006

Journal of Alloys and Compounds

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“…Some apatite-type single crystals may be synthesised by a flux method [17,19]. Single crystals of NaLag(GeO4)602 were obtained at 950 ~ using Na2CO 3 (30 mol% excess to compensate the evaporation of NazO), LazO 3 and GeOa as starting materials with PbO-B:O3-Na:O mixture as flux [ 17].…”

Section: A Brief Review Of Apatitesmentioning

confidence: 99%

Synthesis and ionic conduction of apatite-type materials

Tao

Irvine

2000

Ionics

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Abstract. Apatite is a mineral with general formula Ml0(XO4)6Z2, where M are metallic elements such as Li § Na +, K*, Ca 2 § Sr z+, Ba 2 § Ln 3 § etc.; X = P, V, S, Si, Ge, Re, Cr etc; Z = F-, CI-, I-, OH-, O z-, S a-etc. Some materials with apatite structure (S.G. P63/m) exhibit quite high cationic (Li § H § etc.) and/or anionic (F-, C1-etc.) conduction. Recently, it was reported that some rare earth silicates, e.g., Lam(SiO4)603, exhibit quite high oxide-ion conductivity. In this paper, we discuss chemical composition, structure, synthetic procedure and ionic conduction of apatite-type materials. Recent improvements are briefly reviewed. High ionic conductivity has been observed for both cation deficient, oxygen stoichiometric La9.33(5iO4)60 a and cation stoichiometric, oxygen excess Lalo(SiO4)603 compositions. Grain boundary conductivity is usually low, which tends to dominate the impedance response. The resistance, particularly the grain boundary resistance is also found to depend on pO a.

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“…As a consequence, oxyapatites are well-known as one-dimensional anionic conductors. [6][7][8][9] Previous works have already reported the importance of the presence of cationic vacancies to explain the O 2− ions diffusion in the oxyapatite structure. 6,7 According to these studies, the existence of these unoccupied cationic sites allows a light displacement of O 2− ions in large tunnels: "interstitial-like" conduction paths are thus created, explaining the good conductivity values of these materials.…”

Section: Introductionmentioning

confidence: 98%