Seated portrait of Dr. Eugen Oppenheimer; Chicago Portraits Men

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Portrait of Bertha Oppenheimer nee Strauss Portraits; Women

Wife of Emil Oppenheimer and mother of Louis Oppenheimer

Students on the steps of the Lehranstalt fuer die Wissenschaft des Judentums (Jewish teachers' seminary); Berlin Institutions; Educational; Schools; Portraits; Groups

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Students on the steps of the Lehranstalt fuer die Wissenschaft des Judentums (Jewish teachers' seminary); Berlin Institutions; Educational; Schools; Portraits; Groups

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Martin Buber seated on wall outdoors at breakfast time; Berne Portraits Men

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Portrait of Herbert Gilbert Portraits Men

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Portrait of Hedy Davis Portraits Women

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The photographer Harry Polk outdoors with his daughter Grace Polk Portraits Family

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Portrait of the photographer Harry Polk outdoors Portraits Men

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Rabbi Leo Baeck with Willard Johnson of the World Brotherhood and Rabbi S. Andhil Fineberg of the American Jewish Committee, after a dinner honoring Baeck; World Brotherhood; Bonn Portraits Groups; Men

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Precipitation of rutile and anatase (Tio12) fine powders and their conversion to MTiO3 (M = Ba, Sr, Ca) by the hydrothermal method

Fine powders of TiO2 (rutile) with high degree of crystallinity are formed from aqueous titanium oxychloride solution under hydrothermal conditions at 160–230°C and 15–100 kg/cm2 for 1–2 hours. The anatase phase is produced from the same medium when sulfate ion impurity is present, with Image . Both these fine powders are converted to BaTiO3, SrTiO3 or CaTiO3 when suspended in Ba(OH)2 or Sr(OH)2 solution or in an aqueous slurry of carbonate-free CaO with Image , at 180–280°C and 12–65 kg/cm2 for 4–8 hours. The resulting fine powders contain monocrystallites of the perovskite phase with 0.1–1.5 μm particle size.

Portrait of Caecilie Witkowski nee Seligsohn Portraits Women

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Portrait of Moritz and Helene Leffmann Portraits Couples

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Portrait of unidentified woman Portraits Women

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Portrait of unidentified man Portraits Men

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