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249portion of the ternary system become more complex. The compound BaTi,O, was not observed in any of the ternary compositions fired at subsolidus temperatures but could be readily detected when compositions lying in the compatibility triangle BaTi0,-Ba,iTi,,O,,,-Ba,TiGe~O, were cooled from the melt. The compounds and BaGe40, melt congruently; therefore, many subsolidus joins appear as true binary subsystems at liquidus temperatures. The compounds Ba,TiO, and Ba,GeO, are isostructural, and evidence obtained by X-ray powder diffraction indicated that these compounds probably form a continuous series of solid solutions with each other. No appreciable solid solubility was found in the quasi-binary joins Am. Ceram. Soc., 38 [4] 142-46 (1955). 389-95. 102-13.BaO-TiO,-ZrO,," ibid., 41 [lo] 390-94 (1958). Compound with Temperature-Stable High Permittivity and Low Microwave Loss,"J. Am. Ceram. Soc.. 57 [lo] 450-53 (1974). I ' H. M. O'Bryan, Jr. and I. Thomson, Jr., "Phase Equilibria in the Ti0,-Rich Region of the System BaO-TiO,," ibid.. (121 522-26.

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Die Phasenbeziehungen im Titelsystem werden durch Heißpressen (1600‐l 750°C) der entsprechend zusammengesetzten Pulver bestimmt.