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American Mineralogist 2008;93:241-247.
Effects of ionizing radiation on the hollandite structure-type: Ba_0.85Cs_0.26Al_1.35Fe_0.77Ti_5.90O₁₆
Abdesselam Abdelouas, Satoshi Utsunomiya, Tomo Suzuki, Bernd Grambow, Thierry Advocat, Florence Bart, and Rodney C. Ewing
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FIGURE 1. (a) Unit cell of hollandite-type structure viewed down the b-axis. Crystallographic parameters of priderite from Post et al. (1982) were used because of the closely related chemistry to the hollandite of the present study. (b) Secondary electron image showing polycrystals of a few micrometer-sized grains of hollandite. (c) Back-scattered electron image of the polished cross-section of a hollandite powder. (d) Powder X-ray diffraction pattern of hollandite synthesized in this study.

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FIGURE 6. The amount of Cs normalized to the surface area (m²) leached from unirradiated and irradiated hollandite as a function of time in pure water at 365 K. The open and filled symbols represent unirradiated and irradiated hollandite, respectively. The gamma-irradiated hollandite received an absorbed dose of 2.4 x 10⁶ Gy prior to corrosion experiments.

American Mineralogist 2001;86:205-214.
Partitioning of Sr between coexisting minerals of the hollandite- and piemontite-groups in a quartz-rich schist from the Sanbagawa metamorphic belt, Japan
Masaki Enami and Yasuyuki Banno
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FIGURE 10. Strontium distribution between hollandite- and piemontite-group minerals. Numbers enclosed in rectangular boxes indicate the Sr-distribution coefficient between hollandite (Hol) and piemontite-group minerals (Pie) [D = X_Sr(Hol)/X_Sr(Pie)], where X_Sr indicates site proportions of Sr in ^[8]A-site of hollandite and ^[10]A2-site of piemontite-group minerals.

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FIGURE 1. Photographs of (a) piemontite-rich lens with a small hollandite-abswurmbachite nodule, (b) a thin section of the piemontite-rich lens, and (c) hollandite-abswurmbachite nodule. Abbreviations are: Hol(m) = hollandite-rich mantle; Awb(c) = abswurmbachite-rich core.

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FIGURE 5. Strontium (a), Ba (b), and K (c) X-ray maps of a hollandite-rich cluster; a Sr X-ray map (d) of a cluster consisting of hollandite and piemontite-group minerals; and Mg(e) and Cu (f) X-ray maps of abswurmbachite-rich cluster. Brighter shades indicate higher content of element. Abbreviations are: Hol = hollandite-group minerals; Pie = piemontite; Sr-pie = strontiopiemontite; Awb = abswurmbachite. Others are defined in Figure 2.

American Mineralogist 2001;86:871-880.
Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
Gilles Leturcq, Thierry Advocat, Kaye Hart, Gilles Berger, Jacques Lacombe, and Armand Bonnetier
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FIGURE 1. SEM images of the melted materials. (a) Melted Synroc C: M = molybdates, Z = xirconolite, R = rutile, P = perovskite, H = hollandite. (b) Rocsynmar: Z = zirconolite, R = rutile, P = perovskite, H = hollandite. (c) Ce-zirconia. (d) Aluminotitanate: A = Al₂TiO₅ + Li₂Al₂Ti₄O₁₂; B = Ce_0.66TiO_2.98; C = rutile.

American Mineralogist 2006;91:327-332.
Equation of state and phase transition in KAlSi₃O₈ hollandite at high pressure
Tristan Ferroir, Tsuyoshi Onozawa, Takehiko Yagi, Sebastien Merkel, Nobuyoshi Miyajima, Norimasa Nishiyama, Tetsuo Irifune, and Takumi Kikegawa
[Abstract] [Full Text] [PDF]

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FIGURE 1. X-ray diffraction patterns of KAlSi₃O₈ hollandite obtained in the run He1 at (a) 17.1GPa, and (b) 30.1 GPa. Diffraction patterns from gold pressure marker are overlapped and some strong peaks from hollandite are indexed for the comparison with Figure 2.

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FIGURE 2. Integrated X-ray diffraction patterns of KAlSi₃O₈ hollandite measured with increasing pressure. Many peaks start to split at about 20 GPa as a result of the transformation to hollandite-II. Patterns were indexed in I4/m (below 20 GPa) and I2/m space groups (30.1 GPa). Not all the indexed peaks are shown. Helium was used as pressure-transmitting medium. Some non-indexed peaks are from either the gold pressure marker or from the gasket material.

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APPENDIX FIGURE 1. Absorbed dose (Gy) by hollandite doped with 5% radioactive caesium.

10.

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TABLE 1. The average composition of synthetic hollandite determined by EMPA (n = 15)

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