期刊
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
卷 42, 期 8A, 页码 L946-L948出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.42.L946
关键词
BaTi2O5; high Curie temperature; high dielectric constant; ferroelectrics; D-E loop; space group
A needle-shaped BaTi2O5 crystal was grown from a Ti-rich solution. The chemical composition of the crystal was analyzed by an electron probe micro-analyzer (EPMA). X-ray Weissenberg photographs were taken at room temperature (RT): the crystal is monoclinic with a = 16.91 Angstrom, b = 3.94 Angstrom, c = 9.49 Angstrom, beta = 103.0degrees and Z = 6. A broad and large dielectric anomaly reaching 30,000 was observed at 430degreesC for the dielectric constant along the b-axis. Also, spontaneous polarization was estimated to be approximately 7 muC/cm(2) from the D-E loops at RT. Thus the crystal is a new ferroelectric substance with a high Curie temperature of 430degreesC and the space group C-2 at RT.
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