AuszugEs wird über ein Frequenzübersetzungs-Experiment am Kaliumjodat in der rhomboedrischen Phase berichtet. Das Ergebnis des Experiments zeigt, zusammen mit einem früheren pyroelektrischen Versuch, daß rhomboedrisches KJO3 kein Inversionszentrum besitzt, also die Raumgruppe RZm hat und nicht die neuerdings angegebene zentrosymmetrische Raumgruppe R^m. AbstractAn experiment (second harmonie generation) on potassium iodate in the rhombohedral phase is reported. This result, plus a previously reported experiment (pyroelectricity), shows that rhombohedral KIÜ3 is acentric, R3m instead of the recently reported centrosymmetric ÄSTO.
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